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ISDN TA/V

18.8 Reverting to AT Command (BAK)

The

BAK

command is used to revert from V.25bis command mode to AT

command mode. Note that when the ISDN TA/V is in AT command mode it
will not accept V.25bis commands. To revert to V.25bis command mode an
appropriate data transmission mode command must be issued (see

Section

14.1

for details).

Summary of Contents for IS300AE

Page 1: ...nical support 24 hours a day 7 days a week Call 724 746 5500 or fax 724 746 0746 Mail order Black Box Corporation 1000 Park Drive Lawrence PA 15055 1018 Web site www blackbox com E mail info blackbox com ISDN TA V ISDN TA V POWER ISDN OK SEND RECEIVE ANSWER TERMINAL 1 TERMINAL 2 ON LINE 1 ON LINE 2 JANUARY 1995 IS300AE ...

Page 2: ...ance could void the user s authority to operate the equipment This digital apparatus does not exceed the Class A limits for Radio noise emission from digital apparatus set out in the Radio Interference Regulation of Industry Canada Le présent appareil numérique n émet pas de bruits radioélectriques dépassant les limites applicables aux appareils numériques de la classe A prescrites dans le Règleme...

Page 3: ...ring for Installation 20 4 2 Connecting a Computer 20 4 3 Connecting an Alternate DTE Device 20 4 4 The CONTROL Port Connection 20 4 5 Your Communication Software 21 4 6 The Connecting Cable 21 4 7 ISDN Service Connection 21 4 8 Service Number of the Remote Device 21 4 9 Communication Settings 22 5 Installing the ISDN TA V Without Intro 23 5 1 Connecting Your ISDN TA V 23 5 2 Powering On the ISDN ...

Page 4: ...rol 45 10 1 5 Line Transmission Speed 46 10 1 6 V 110 Rate Adaption 46 10 2 File Transfer Protocols 46 10 3 Terminal Emulation 47 11 Commanding the ISDN TA V 48 11 1 Via Communication Software Commands 48 11 2 Via Intro Software Menu Selections 49 11 3 Using AT Commands 50 11 4 AT Command Rules 50 11 4 1 Formatting Command Lines 51 11 4 2 Combining Commands 52 11 4 3 Waiting for a Response 52 11 4...

Page 5: ...ns Signaling Requirements 71 14 5 1 DTR Control 72 14 5 2 DSR Control 72 14 5 3 RTS Control 73 14 5 4 CTS Control 73 14 5 5 RTS CTS Delay 73 14 5 6 DCD Control 74 15 User Commands 75 15 1 Selecting AT or V 25bis Dialing Commands 75 15 2 AT Escape Sequence Character Key and Response Timeout 75 15 3 Effect of the BREAK Key on a Terminal s Keyboard 76 15 4 Command Character Echo 77 15 5 Defining the ...

Page 6: ...cteristics 86 17 3 Flow Control Characteristics XON XOFF 86 17 4 Buffer Disconnect Timer 87 18 V 25bis Dialing Commands 88 18 1 Call Request Commands 88 18 2 Call Responses 89 18 3 Call Answer Commands 90 18 4 Storing Numbers in Memory PRN 90 18 5 Requesting a List of Stored Numbers RLN 91 18 6 List Stored Number Response 91 18 7 Command Responses Valid and Invalid 91 18 8 Reverting to AT Command ...

Page 7: ...8 ISDN TA V Part I Getting Started ...

Page 8: ...M Data Compression V 42 bis Speed X 21 V 11 synchronous up to 64000 bps asynchronous up to 115200 bps with V 42 bis V 24 V 28 Up to 19200 bps V 36 Up to 48000 bps Connectors 1 RJ 45 female for the ISDN S bus 1 Modular phone socket connector type will vary depending on which ISDN TA V you purchase 1 DB25 female for your DTE 1 RJ 11 female CONTROL port for entering asynchronous AT commands Power 190...

Page 9: ...rate analogue port is also provided which can support a connection to any standard analogue telephone network compatible equipment working in DTMF dial tones not pulses mode There are 10 separate models of the ISDN TA V with different power and ISDN line specifications to accommodate the various requirements of countries throughout the world These differences have no effect on the overall performa...

Page 10: ...to install and use Intro Then skip to Chapters 6 and 7 for information about making and receiving ISDN calls Installing ISDN TA V Without the Intro Software Chapters 4 7 These chapters provide a brief introduction for people who don t use the Intro software You ll learn how to install the unit what additional equipment you ll need to establish a connection to a remote device and finally how to con...

Page 11: ... it is important that you compare the contents of the shipping package against the packing list If any of items listed are damaged or missing call your supplier to resolve the matter immediately You ISDN TA V should include 1 ISDN TA V 1 Mains power cord 1 3 metre line cord for connecting to the ISDN2 service 1 2 metre DB9 female to DB25 male V 24 DTE cable This User s Manual 1 3 5 inch diskette c...

Page 12: ...d digital network which enables voice data communications video and many other services to be transmitted simultaneously over a single pipe consisting of two 64000 bps streams and a 16000 bps control channel The two 64000 bps streams are known as the bearer channels B channels for short B1 and B2 with the control channel being referred to as the D channel Your ISDN TA V is approved for connection ...

Page 13: ...separate CONTROL port is provided for optionally entering AT commands from an attached asynchronous terminal and for accessing the management interface of the ISDN TA V When the DTE interface is configured to operate asynchronously default configuration setting the CONTROL port would not normally be used since all commands can be entered via the DTE However AT commands can only be entered asynchro...

Page 14: ... configurations containing the most commonly used DTE interface settings are permanently stored in the Terminal Adaptor s memory providing you with a quick and easy method of configuring the unit to be compatible with asynchronous and synchronous data environments conforming to ITU V 24 V 28 X 21 V 11 or V 36 The principal features are Support for digital to digital communication at speeds up to 6...

Page 15: ...g via AT commands V 25bis or via PC by raising DTR on the PC to DTE interface High speed transmission using asynchronous synchronous or UNIX devices over the ISDN Self testing facility Four factory set configurations and two user definable configuration locations Front panel LCD and LED displays to inform you of the current status ...

Page 16: ...alling and using your ISDN TA V will be clearly explained on screen Installation is now complete with each physical connection having been tested for you Using Intro you will now be able to make ISDN TA V configuration changes etc 3 2 About the Intro Program Initially Intro familiarizes you with the ISDN TA V and explains how it should be connected to a DTE the ISDN line and a telephone handset Ea...

Page 17: ...remainder of this manual 2 Follow the instructions given on screen to install the files within the required directory 3 4 Connecting Your ISDN TA V Once the Intro files are installed on your hard disk answer YES when the final screen prompts you with Your software is installed Are you ready to install the ISDN TA V now This automatically initiates the Intro program and displays its base screen opt...

Page 18: ...ISDN TA V A powerful function of the Intro software is that it enables you to alter the ISDN TA V s factory default configuration settings using simple menu selections However as previously mentioned the factory default configuration will normally be sufficient for most ISDN TA V users and may never need to be altered We therefore recommended that this function of the Intro software only be used b...

Page 19: ...one serial port and this is already supporting an external device you can swap between the ISDN TA V and the other device as required However if you prefer to use both devices without the interruption of plugging and unplugging cables ask your PC supplier to install a second serial port 4 3 Connecting an Alternate DTE Device This must be equipped with either a V 24 V 28 X 21 V 11 or V 36 serial po...

Page 20: ...age If for any reason you have to make up a cable yourself refer to the cable specifications in the Appendix As a general rule the shorter the cable the better it is Apple Macintosh users should refer to Section 5 4 for details on the connecting cables they ll need 4 7 ISDN Service Connection You will need a standard ISDN line wall socket to plug your ISDN TA V s line cable into If one is not avai...

Page 21: ...stage to understand the significance of the format The most popular setting for data format of a service which is connected to the PSTN is 8 data bits no parity 1 stop bit described as 8N1 although many public data services use 7 data bits even parity 1 stop bit 7E1 You will normally be advised of the format used by the remote computer or service on payment of a subscription or on request if no su...

Page 22: ...ps to connect the ISDN TA V between your computer and the ISDN line Figure 5 1 Front and Back Views of the ISDN TA V 1 Ensure that both your computer and the ISDN TA V are powered off The half of the back panel ON OFF switch with a circle is depressed 2 Connect the supplied power lead into the socket marked with the proper voltage indication on the ISDN TA V 3 Plug the other end of the mains lead ...

Page 23: ...ck end into the socket marked LINE on the back of the ISDN TA V Note that any ISDN TA V can be damaged by lightning When the possibility of lightning is high unplug this connection to the telephone line Warning Interconnection directly or by way of other apparatus of ports marked SAFETY WARNING see instructions for use with ports marked or not so marked may produce hazardous conditions on the netw...

Page 24: ... this analogue port Incoming ISDN traffic carries a voice data identifier which enables the ISDN TA V to automatically direct incoming voice calls to the handset port and incoming data calls to the DTE interface 9 Plug the unattached end of the supplied line cable into the ISDN wall socket 5 2 Powering ON the ISDN TA V Having carefully followed the instructions for connecting your ISDN TA V swith ...

Page 25: ...g data received over the ISDN to the DTE interface ANSWER Lights to indicate that the ISDN TA V has been configured to automatically answer an incoming data call When an incoming data call is detected this indicator will flash TERMINAL 1 This is an indicator of a signal provided by the computer or terminal attached to the ISDN TA V s DTE interface It is normally used to signal the ISDN TA V that a...

Page 26: ...s shown in Figures 5 2 and 5 3 5 4 1 USING CABLE THAT S COMPATIBLE WITH YOUR COMMUNICATION SOFTWARE Before you can select the appropriate cable for connecting the DTE interface to your Macintosh computer it is important that you first ascertain whether the communication software that you are going to use to command the ISDN TA V supports hardware or software handshaking as the means of flow contro...

Page 27: ...fore a communications link can be established Having connected the DTE interface to the Macintosh switch on power to the ISDN TA V Following the instructions given in your communication software manual use the software to change the ISDN TA V s operating configuration by typing the following command AT Q1 D2 W CR Within this command string the characters W indicate that the command is to be stored...

Page 28: ...N TA V communications the flow control system used should be of the type RTS CTS otherwise known as hardware flow control which should be specified within the communication software configuration Hardware flow control is recommended over software flow control because it allows fully transparent passage of data through the ISDN TA V in that the TA V s flow control does not interfere with any data o...

Page 29: ...g the Command Language of Your ISDN TA V The command language used to issue instructions to your ISDN TA V such as dial a number or answer a call is compatible with the industry standard AT commands and can be typed directly at your computer s keyboard in asynchronous mode or indirectly via the menu structure of your communication software package Unfortunately we have to generalise at this point ...

Page 30: ...erating characteristics accordingly thus ensuring compatibility with the attached device Note that for efficient and uninterrupted data transfer it is important that the data rate of the ISDN line is slower than the data rate of the DTE interface If this situation is reversed data arriving on the line will overflow the ISDN TA V s buffers while waiting to be sent from the DTE interface to your com...

Page 31: ...played on its front panel LCD During a dialing sequence the display will read DIALING xxxxxxxxx followed by REMOTE RING or CALL FAILED depending on the state of the line When making a call the ISDN TA V behaves much the same way as a human telephone user It connects to the line dials the number and then listens for a response If the unit hears an engaged tone or doesn t get an answer within a conf...

Page 32: ... or contact the remote computer s operator You can browse through the remote computer s directories read and send mail etc 7 5 Initiating a File Transfer Having established a call to the remote computer you now have direct access from your local keyboard The method used to initiate a file transfer will depend on the communication software package that you are using refer to your communication soft...

Page 33: ...altered using AT commands detailed in the Reference section On receipt of an incoming data call your ISDN TA V s front panel LCD displays INCOMING RING The word RING will be echoed to your computer screen providing your computer is running a communication software program and is in communication with the TA V This call can be answered by selecting the appropriate menu option within your communicat...

Page 34: ...voice calls will automatically be directed to the telephone handset socket and all data calls will be sent to the DTE interface 7 8 Where to Go From Here Now that you know the basics of how to use your ISDN TA V you are unlikely to need to know much more to get maximum performance from it This is because your communication software performs most of the tasks for you To answer any questions that yo...

Page 35: ...is at least a 3 centimetre gap between the sides of your ISDN TA V and any other object Do not place your ISDN TA V on its side If You Cannot Connect the ISDN TA V to the Computer First verify that your computer is equipped with an available serial port otherwise contact your computer supplier If the ISDN TA V to computer cable will not connect to the computer s port contact your equipment supplie...

Page 36: ...e ISDN TA V s other LEDs should light and extinguish depending on the action being taken during normal operation if they do not light in accordance with their function see Section 5 3 contact your equipment supplier The ISDN TA V Doesn t Attempt to Dial If the TERMINAL 1 LED is lit but the unit does not dial when instructed to do so by your communication software check that the dialing command bei...

Page 37: ...r incoming line The ISDN TA V Connects with the Remote Device but Locks Up Ensure that the ISDN TA V to computer flow control method being used is correctly configured into the communication software program s operating parameters By default your ISDN TA V uses hardware flow control RTS CTS If this is incorrectly set data may be interpreted as a flow control character stopping the flow of data The...

Page 38: ...n is made The safety status of the interconnection ports on the back panel of the unit are as follows Ports identified by LINE and the handset symbol TNV Ports identified by DTE symbol and CONTROL SELV TNV Is a circuit which under normal operating conditions carries telecommunications signals SELV Is a secondary circuit which is so designed and protected so that under normal and single fault condi...

Page 39: ...own Live L Ensure that neither the brown or blue wires are connected to the earth pin When replacing the unit s fuse accessed via the back panel ensure that you replace it with one of the same amp and voltage rating Interference and Safety Requirements Radio frequency interference may be caused by incorrect operation or inadequate maintenance of this equipment This unit is intended for use with sc...

Page 40: ...this Reference Section in Support of the Intro Software If your ISDN TA V is connected to a DOS based IBM compatible PC with a hard disk and a 3 5 inch floppy drive you will no doubt have used the supplied Intro software to help you install the unit and make your first call When using Intro you will also have noticed that one of its main menu options enables you to CONFIGURE the ISDN TA V by appli...

Page 41: ...T command language or management interface menu structure since you are likely to have to command the modem using a VT100 terminal connected to the CONTROL port Even in circumstances where you can use Intro to command the ISDN TA V the DTE interface is operating asynchronously you may need to comple ment the explanation given within Intro of any feature s options by reading about the particular fe...

Page 42: ...e today uses a deviant of the industry standard set of commands known as AT codes to control all aspects of its operation Control over the ISDN TA V can then be initiated directly using the commands via a communications software program or via the Intro software program installed in the DTE interface attached PC providing that the DTE interface is configured to accept asynchronous command Direct c...

Page 43: ...hecksum If these numbers differ the receiving ISDN TA V requests a resend of that data block from the transmitting ISDN TA V V 42 error correction is an important feature of your ISDN TA V in that it automatically compensates for data corruption that has been caused by intermittent line quality However since the method of correction is to request a resend it cannot of course compensate for a line ...

Page 44: ...DN TA V and the line rate speed of transfer down the ISDN line normally differ in data communications as outlined in Section 10 1 3 Because of this a technique of data buffering to prevent data loss during transmission is required Flow control is the method by which your ISDN TA V and computer tell each other when they have the capacity to receive more data and when they have not in which case the...

Page 45: ...al Adaptor is regarded as the common standard among manufacturers of ISDN TA Vs thereby ensuring interoperability when communicating with other manufacturer s Terminal Adaptors 10 2 File Transfer Protocols Files are passed between communicating devices in blocks of data using transfer protocols such as XMODEM YMODEM ZMODEM Kermit etc These protocols determine the block length type of error detecti...

Page 46: ...vice By making your computer emulate a particular type of terminal the software sets up the correct control codes which are passed to the remote computer during dial up and answering and informs your computer how to handle certain control characters that are sent from the remote device A large number of communications software packages are available and the majority of them have many terminal emul...

Page 47: ...nt communications software program in the computer which is connected to the DTE interface What you were in effect doing was sending a limited range of AT commands to your ISDN TA V which had a direct effect on its operation Remember how when configuring the communications software you were asked to identify the ISDN TA V command language and you specified it to be AT compatible By doing this you ...

Page 48: ...ther methods to command the ISDN TA V Each of your ISDN TA V s features and functions which can be altered using Intro are described within the program s on screen menus and when one of these features or functions is selected a help box is displayed giving details of the effect it will have on the ISDN TA V s operating characteristics When you confirm your selection the software then builds the co...

Page 49: ...f your TA V 11 4 AT Command Rules AT commands can be entered from any asynchronous computer or terminal attached to the ISDN TA V s DTE interface providing it is communicating with the DTE interface is in terminal mode and the DTE interface is configured to accept asynchronous commands Alternatively AT commands can be entered from any asynchronous computer or VT100 terminal attached to the ISDN TA...

Page 50: ...TA V S register setting ISDN TA V S registers their function and possible settings are explained later in this manual Many commands have two or more possible options the setting of which determines the operating characteristics of that particular function of your ISDN TA V Each and every command has a factory setting which varies according to the ISDN TA V configuration being used The command s nu...

Page 51: ...r a response from the ISDN TA V between typing the terminator character normally a CR and starting to type a new command line Commands which take a long time to action such as a dialing string or an answer command will be abandoned if a character is sent from the computer to the ISDN TA V before the command has been completed The type of ISDN TA V response is dependent on the command issued and is...

Page 52: ...e passing data between your computer and a remote computer the passage of data has to be interrupted if you wish to issue any commands to your ISDN TA V for example if you wish to hang up the call Note that this interrupting action does not break the connection to the remote ISDN TA V To interrupt the data flow a special command is used which does not require either the AT prefix or the terminator...

Page 53: ...and If you have placed the ISDN TA V in command mode and are still connected to the remote system type ATO CR at your keyboard to go back on line Anything that you type from the keyboard will then be transmitted to the remote modem or ISDN TA V If the connection was broken for any reason while you were in command mode to go back on line you will have to instruct the ISDN TA V to re dial the remote...

Page 54: ...es which are made while the ISDN TA V is powered on The configuration within this memory location is termed the active configuration This chapter explains the significance and use of each of these configurations how to build and store configurations within the user definable locations and how to examine the active configuration 12 1 Factory Configurations The four factory set configurations which ...

Page 55: ...uration which the ISDN TA V is actually using to operate at any particular time When the ISDN TA V is powered on the power up configuration is automatically loaded into the memory location reserved for the active configuration and then any one or more of the configuration parameters can be altered to suit a particular operating requirement It should be noted that the ISDN TA V s parameter settings...

Page 56: ...ompt disappears before addressing the ISDN TA V further 3 If you are using the Intro software to command your ISDN TA V select the CONFIGURE option from the software s main menu and select BY APPLICATION from the sub menu to display a description of the function of each factory configuration By highlighting the required application and confirming your selection the corresponding factory configurat...

Page 57: ...uration will be displayed along with an index of the commands used to access more detailed information relating the configuration s parameters In the example given here Factory 0 is being used as the active configuration Type AT V CR to display ISDN TA V Configuration Summary DTE Interface ASYNC AUTOBAUD Commands AT Autoanswer ENABLED WITH DTR Protocol AUTO SELECT Flow Control RTS CTS Configuratio...

Page 58: ...GURATION Having established a link between your computer and the ISDN TA V and using either your communications software program the Intro software or a terminal attached to the CONTROL port load the factory configuration which most closely resembles your requirements as the active configuration following the instructions given in Section 12 2 Then type the AT commands required to alter the config...

Page 59: ... save a more appropriate configuration to the power up memory location which will subsequently be loaded each time you power on the ISDN TA V The active configuration is the only configuration that can be manipulated and saved to an alternate location and this must therefore be configured to reflect the parameter settings that you want to store as your power up configuration To save the active con...

Page 60: ... call can be automatically dialed by the ISDN TA V when the control signal DTR Data Terminal Ready is detected on the ISDN TA V s DTE interface 13 1 Using the D Command The D command followed by the number that you wish to dial forms the AT command line that is used to instruct your ISDN TA V to dial a number Following the command language rules as specified earlier issuing the command ATD12345678...

Page 61: ...non volatile memory to store up to twenty frequently used ISDN numbers and each storage location can hold a maximum of 20 characters Any one of these storage locations can later be recalled and the number dialed automatically 13 2 1 STORING A NUMBER IN ONE OF THE DIRECTORY LOCATIONS Assuming that your ISDN TA V is in command mode your computer is in terminal emulation and the ISDN TA V is off line...

Page 62: ...he directory location For example ATDN2 CR will instruct the ISDN TA V to dial the number stored in its directory location number 2 13 3 Clearing a Call Disconnecting the call can be done in a number of ways A controlled disconnection is one where you select the disconnect option from the menu of the remote computer service termed as logging off this causes the remote modem to disconnect first You...

Page 63: ...r manually using the attached handset by selecting the ANSWER option from your communica tion software s menu or by issuing the AT command ATA CR 13 5 ISDN TA V Response Codes The type and complexity of responses that your ISDN TA V displays in its LCD and to your screen is dependent on the setting of two AT commands as outlined in this section The Q command is used to enable or disable your ISDN ...

Page 64: ...fix to response codes 20 27 if error correction is used ATX6 CR Adds either V 42 or V 110 suffix to response codes 20 27 if data compression or rate adaption is used 13 5 1 VALID RESPONSE CODES The valid response codes which will be displayed on screen are Numeric Text Description Format Format 0 OK Command executed 1 CONNECT Connected to the line 2 RING A ring voltage is being received on the lin...

Page 65: ...0 bps 11 CONNECT 4800 Connected at 4800 bps 12 CONNECT 9600 Connected at 9600 bps 13 CONNECT 12000 Connected at 12000 bps 14 CONNECT 14400 Connected at 14400 bps 15 CONNECT 19200 Connected at 19200 bps 16 CONNECT 7200 Connected at 7200 bps 19 CONNECT 300 Connected at 300 bps 28 CONNECT 38400 Connected at 38400 bps 30 CONNECT 57600 Connected at 57600 bps 34 CONNECT 115200 Connected at 115200 bps 44...

Page 66: ...2400 bps with error correction or data compression 21 CONNECT 4800 EC Connected at 4800 bps 22 CONNECT 9600 EC Connected at 9600 bps 23 CONNECT 12000 EC Connected at 12000 bps 24 CONNECT 14400 EC Connected at 14400 bps 25 CONNECT 19200 EC Connected at 19200 bps 26 CONNECT 7200 EC Connected at 7200 bps 27 CONNECT 300 EC Connected at 300 bps 29 CONNECT 38400 EC Connected at 38400 bps 31 CONNECT 5760...

Page 67: ...g are omitted 14 1 Data Transmission Mode Your ISDN TA V can be used in a variety of transmission modes enabling you to connect to a range of operating environments The required mode is dependent on the computer or terminal to which the ISDN TA V is attached as well as the system to which you want to establish a communica tion link The command language used to instruct your ISDN TA V is also gover...

Page 68: ...and set is disabled refer to Chapter 18 for details of the V 25bis dialing commands A synchronous interface card must be installed in your PC M236 or Q236 Synchronous mode with the AT command set disabled M4 or Q4 Asynchronous operating mode where the ISDN TA V dials the number stored in directory location 1 when the DTR signal turns off and then on on the DTE interface 14 2 DTE Electrical Charact...

Page 69: ... bps R10 600 bps R11 300 bps R13 115200 bps 14 4 Setting the Communications Format The number of data bits the parity and the number of stop bits will be automatically negotiated between the DTE and your ISDN TA V when the DTE first sends an AT command to the ISDN TA V However if the first communication between the ISDN TA V and the DTE is initiated by the ISDN TA V i e when the ISDN TA V is power...

Page 70: ... programs will accept the ISDN TA V factory configuration settings including those of the communications signals behaviour without requiring any changes to be made by the user However a number of these programs need the interface signals to be treated in a particular way requiring you to alter them accordingly If you experience any problems connecting to another system check the user manuals of bo...

Page 71: ...the ISDN TA V is determined by the S command S0 DSR is forced on at all times S1 Normal RS 232 signaling is respected DSR is controlled by the DCE S2 DSR is turned off for 1 or 2 seconds upon a disconnection S3 The status of DSR follows DTR S4 DSR on early This option should not be used unless it is expressly needed to be compatible with an external autodialer device The ISDN TA V operates as per ...

Page 72: ... off in a simulated half duplex operation 14 5 4 CTS CONTROL Clear To Send is the signaling circuit used to indicate to the attached computer terminal that the ISDN TA V is ready to receive information from the DTE How this signal is treated by the ISDN TA V is determined by the D command Note that CTS ignores RTS when RTS flow control is enabled D0 CTS is forced on at all times D1 Normal RS 232 s...

Page 73: ...ected and off when it is not detected C2 DCD is normally forced on although it turns off for approximately one second when the carrier is disconnected C3 DCD follows the state of DTR C4 Simulated control carrier The state of DCD follows the state of the remote ISDN TA V s RTS To ensure correct operation of this facility the remote TA V must be configured with its RTS signaling command set to simul...

Page 74: ...a setting are omitted 15 1 Selecting AT or V 25bis Dialing Commands Whether your ISDN TA V will accept AT or V 25bis dialing commands is dependent on the setting of the M or Q command see Section 14 1 Factory configurations 0 and 2 are configured to accept AT commands while Factory 1 and 3 are configured to accept V 25bis dialing commands 15 2 Defining the AT Escape Sequence Character Key and Resp...

Page 75: ...key on a terminal keyboard can be used to interrupt data flow The effect on the data held within the ISDN TA V s buffer and the state of the ISDN TA V varies according to the setting of the K command where K0 A destructive break occurs each time the BREAK key is pressed A break character is immediately sent and the ISDN TA V reverts to command mode All data in the ISDN TA V s buffers is lost K1 A ...

Page 76: ...be altered using the command S3 n where n is a value from 0 to 127 The default setting for the terminator character is S3 13 13 being the ASCII value of the carriage return key 15 6 Defining the Backspace Character Key The keyboard character used to action a backspace within a command line move the cursor to the left and erase the previous character is defined within S Register S5 using the ASCII ...

Page 77: ...minal is dependent on the settings of the Q X and V commands Refer to Section 13 5 for a full description of these commands and the options that they provide 15 9 V 25bis Command Mode Format When the ISDN TA V is using a configuration which requires V 25bis dialing commands according to the M or Q command setting as opposed to AT commands the format of these commands is dictated by the value of S ...

Page 78: ...alid commands according to the value of S Register S84 S84 0 Normal response codes are enabled S84 1 The ISDN TA V will respond to an AT command with OK irrespective of whether the AT command was valid or not S84 2 The ISDN TA V will respond to any AT command with OK but will not implement those that would normally result in a change to a configuration 15 11 Audible Alert Control The B command is ...

Page 79: ...allow compatibility with certain software packages I1 Requests that a checksum of the ISDN TA V s firmware ROM is performed The response is displayed as two sets of four hexadecimal digits separated by a colon e g 124A 3FC6 I2 Instructs the ISDN TA V to validate that the firmware checksum is correct by comparing it with a stored value Note that due to the time taken to calculate the checksum the I...

Page 80: ...text The AT prefix and CR suffix required when commanding the ISDN TA V to alter a setting are omitted 16 1 ISDN Line Transmission Rate S register S41 determines the transmission data rate over the ISDN line By default this parameter is configured as S41 1 thereby enabling automatic sensing of the appropriate rate up to 64000 bps In synchronous operating mode the setting of S41 dictates the DTE ra...

Page 81: ...this S Register should be set to 0 S0 0 The default setting is S0 1 indicating that providing DTR is high on the ISDN TA V s interface the ISDN TA V will automatically answer a call after the first ring 16 3 Causes of a Disconnection This section details the commands and S Register settings that determine when your ISDN TA V will disconnect a call 16 3 1 NO ANSWER TIMER The length of time in secon...

Page 82: ...CEIPT OF A LONG SPACE CHARACTER The Y command setting determines the action your ISDN TA V will take if it detects a long space character A long space is the equivalent of a break which has a duration of 2 or more seconds Long space disconnect should be disabled in synchronous data mode Y0 Long spaces are ignored Y1 The ISDN TA V disconnects if a long space is detected Transmission of long spaces ...

Page 83: ... compatible with that used by the remote ISDN TA V and in the majority of cases N10 will prove to be the optimum setting However if this option is not compatible with the remote device you will have to select the appropriate setting from the list below If you do not know which protocol the remote device is configured to use and have tried to establish a connection using the default value but found...

Page 84: ...equently call your ISDN TA V and you want to speed up the connection time with non error correcting ISDN TA Vs by avoiding the error correction negotiations 17 1 2 DEFINING AN ERROR CORRECTION CANCEL CHARACTER This feature is only referenced if the C command is defined as C2 The error correction cancel character enables the remote ISDN TA V user to stop the error correction negotiations between th...

Page 85: ...mpression is enabled This slowdown will however be hardly noticeable it is therefore recommended that this compression technique is always enabled 17 3 Flow Control Characteristics XON XOFF Defined using the Q and G commands The type of flow control you should use on a given communication link is normally dictated by the requirements of the service you re connecting to and whichever of the two met...

Page 86: ...from the DTE but doesn t pass these characters through to the remote device X1 The ISDN TA V performs flow control and passes the XON XOFF characters to the remote device The setting of this command is ignored if the connected ISDN TA Vs are configured to use an error correction protocol since the error correction routine automatically handles flow control between the two devices 17 4 Buffer Disco...

Page 87: ...nds 18 1 Call Request Commands Call request commands are issued from the DTE to the ISDN TA V and are responsible for initiating any dial calls Call request commands include call request with number provided CRN and call request with stored memory address provided CRS 18 1 1 CALL REQUEST WITH NUMBER PROVIDED CRN The CRN command dials the ISDN number entered from the DTE CRN is similar to the ATD c...

Page 88: ...ere xx is ET Engaged tone Is similar to the result code BUSY NS Number not stored Is similar to the result code ERROR CB Local DCE busy Is similar to the result code ERROR RT Timeout on ring tone Is similar to the result code NO CARRIER AB Abort call on timeout Is similar to the result codes NO DIALTONE and ERROR NT Answer tone not detected Is similar to the result code NO ANSWER FC Forbidden call...

Page 89: ... within 5 seconds the ISDN TA V sends the VAL response to the DTE If DIC is issued after 5 seconds INV is returned 18 3 3 CONNECTING TO AN INCOMING CALL CIC The CIC command forces the ISDN TA V to cancel any DIC commands and answer an incoming call This command is only valid when the DTE issues a DIC command CIC must be issued within 10 seconds after sending a DIC CIC is similar to the ATA command...

Page 90: ... the ISDN number for that location is displayed If no directory location is specified then all ISDN numbers stored in memory are displayed The LSN response format is LSNx n Where x is the directory location and n is the ISDN number 18 7 Command Responses A VAL or INV command response indicates that the command entered was respectively either a valid or invalid entry The VAL response indicates that...

Page 91: ...ed to revert from V 25bis command mode to AT command mode Note that when the ISDN TA V is in AT command mode it will not accept V 25bis commands To revert to V 25bis command mode an appropriate data transmission mode command must be issued see Section 14 1 for details ...

Page 92: ...connect the DTE interface to a KiloStream service or X 21 V 11 device supporting speeds up to 64000 bps is specified below DB25 Male DB15 Male Connector Connector Pin Number Signal name Pin Number 2 Transmit Data A TXDA 2 3 Receive Data A RXDA 4 7 Signal Ground 8 12 Interface automatic identifier 13 Indicate B INDB 12 14 Transmit Data B TXDB 9 15 Indicate A INDA 5 16 Receive Data B RXDB 11 17 Cloc...

Page 93: ...nector Connector Pin Number Signal name Pin Number 2 Transmit Data TXD 103 2 3 Receive Data RXD 104 3 4 Request To Send RTS 105 4 5 Clear To Send CTS 106 5 6 Data Set Ready DSR 107 6 7 Signal Ground 102 7 8 Data Carrier Detect DCD 109 8 15 Transmit Clock TXCLK 114 15 17 Receive Clock RXCLK 115 17 18 Analogue Loop test 141 18 20 Data Terminal Ready DTR 108 20 21 Remote Digital Loop test 140 21 22 R...

Page 94: ... R 4 Request To Send RTS 105 C 5 Clear To Send CTS 106 D 6 Data Set Ready DSR 107 E 7 Signal Ground 102 B 8 Data Carrier Detect DCD 109 F 11 Interface automatic identifier 13 Serial Clock Transmit B SCTB 114 AA 14 Transmit Data B TXDB 103 S 15 Serial Clock Transmit A SCTA 114 Y 16 Receive Data B RXDB 104 T 17 Serial Clock Receive A SCRA 115 V 18 Analogue Loop test 141 19 Serial Clock Receive B SCR...

Page 95: ...t each command can be set to and highlights the setting for Factory configuration 0 in bold text Cmd Section Description AT 11 4 1 Attention command prefix Indicates a command string has started and determines the DTE s data rate and communications format A 11 4 5 Repeat last command string This command must not be preceded by the AT prefix or followed by the command terminator key A 13 4 Answer m...

Page 96: ... the ISDN TA V s name as an ASCII string O 11 5 1 Return to data mode from on line command mode Qn 13 5 Response code facility where n is 0 Enables response codes 1 Disables response codes 2 Enables the originate ISDN TA V only to send response codes to the DTE Required for most UNIX applications Sn 14 Display value of S Register where n is the register number Sn x 15 Change S Register Alters the ...

Page 97: ...sed Yn 167 3 3 Long space disconnect where n is 0 Long spaces are ignored 1 The ISDN TA V disconnects if a long space is detected Transmission of long spaces is enabled Zn 12 2 1 Load a user defined configuration as the active configuration where n is 0 Loads the power up configuration as the active configuration 1 Loads User 1 as the active configuration 2 Loads User 2 as the active configuration...

Page 98: ... of DCD follows the state of the remote ISDN TA V s RTS 5 DCD follows the state of DTR except when disconnecting a call in which case DCD goes off to signal the disconnection while DTR remains on Dn 14 5 1 DTR control where n is 0 ISDN TA V ignores the true status of DTR and treats it as always ON 2 User controlled DTR is controlled by the DTE Fn 12 2 1 Load a factory default configuratin as the a...

Page 99: ...e using bisynchronous V 25bis command of the ISDN TA V 234 Synchronous mode using HDLC V 25bis command of the ISDN TA V 236 Synchronous mode with the AT command set disabled 4 Asynchronous operating mode where the ISDN TA V dials the number stored in directory location 1 when the DTR signal turns off then on on the DTE interface N 13 2 2 Display the dialing directory contents N99 13 2 3 Delete the...

Page 100: ...e ISDN TA V operates as per standard RS 232 signaling except that DSR comes on when the ISDN TA V goes into data mode Vn 12 3 Display the active configuration V displays the configuration s main characteristics Where n is 1 Displays command settings relating to all screens 2 Displays command settings relating to the user interface 3 Displays command settings relating to the user commands 4 Display...

Page 101: ...racters To clear a single ISDN directory location use the same command so that n identifies the directory location to be cleared but enter nothing for x Bn 14 4 1 Number of data bits where n is 0 Seven data bits 1 Eight data bits 2 Nine data bits 3 Six data bits Cn 17 1 1 Early data buffered where n is 0 No data is buffered during the error correction negotiations 1 Received data is stored within ...

Page 102: ...reak character will be sent with all data in the ISDN TA V s buffers being discarded The ISDN TA V however remains in data mode 2 An expedited break occurs each time the BREAK key is pressed The break character is immediately sent and the ISDN TA V reverts to command mode All data within the ISDN TA V s buffers is held there until the ISDN TA V reverts to data mode at which time the buffered data ...

Page 103: ... V 110 rate adaption is employed with a maximum asynchronous data rate of 38400bps 10 V 110 rate adaption with an asynchronous data rate up to 38400bps or V 42bis error correction and data compression if it is negotiated Pn 14 4 2 Parity bits where n is 0 None 1 Even parity 2 Odd parity 3 Mark 4 Space Qn 17 3 Flow control where n is 0 ISDN TA V to DTE flow control is disabled 1 Bidirectional softw...

Page 104: ...haracters 5 Enables unidirectional software flow control from the DTE to the ISDN TA V using XON XOFF characters 6 Enables unidirectional hardware flow control from the DTE to the ISDN TA V using RTS signal Rn 14 3 Default async speed on the DTE 0 57600 bps 1 38400 bps 2 19200 bps 3 14400 bps 4 12000 bps 5 9600 bps 6 7200 bps 7 4800 bps 8 2400 bps 9 1200 bps 10 600 bps 11 300 bps 13 115200 bps ...

Page 105: ...ters are not passed to the remote ISDN TA V 1 XON XOFF characters are passed to the remote ISDN TA V An 17 1 2 Error correction cancel character Where n is an ASCII value from 0 to 127 representing the required keyboard character Hn 17 2 V 42bis data compression 0 V 42bis data compression is disabled 1 V 42bis data compression is only actioned on transmitted data 2 V 42bis data compression is only...

Page 106: ...o answer ring number 1 0 disabled 1 255 rings S2 15 2 AT escape character 43 1 127 ASCII S3 15 5 Command terminator key 13 1 127 ASCII S4 15 7 Line feed character 10 1 127 ASCII S5 15 6 Backspace character 8 1 127 ASCII S7 16 3 1 Wait for answer time 40 1 255 seconds Refer to details of restrictions imposed by the coutry of use S12 15 2 1 AT escape response timeout 50 0 255 in 20 millisecond jumps...

Page 107: ...64000 S49 17 4 Buffer disconnect timer 10 1 255 seconds or 0 immediate disconnect S62 15 9 1 V 25bis character coding 0 0 ASCII 1 EBCDIC S63 15 9 2 V 25bis idle character 0 0 Mark 1 Flag S64 15 9 3 V 25bis new line character 0 0 CR LF 1 CR 2 LF S84 15 10 AT command mode 0 0 normal 1 no ERROR 2 no strap or ERROR S85 16 3 2 Fast disconnect 0 0 normal 1 fast disconnect ...

Page 108: ...TRL K 012 00001100 0C FF CTRL L 013 00001101 0D CR CTRL M 014 00001110 0E SO CTRL N 015 00001111 0F SI CTRL O 016 00010000 10 DLE CTRL P 017 00010001 11 DC1 CTRL Q 018 00010010 12 DC2 CTRL R 019 00010011 13 DC3 CTRL S 020 00010100 14 DC4 CTRL T 021 00010101 15 NAK CTRL U 022 00010110 16 SYN CTRL V 023 00010111 17 ETB CTRL W 024 00011000 18 CAN CTRL X 025 00011001 19 EM CTRL Y 026 00011010 1A SUM C...

Page 109: ... 00101100 2C 045 00101101 2D 046 00101110 2E 047 00101111 2F 048 00110000 30 0 049 00110001 31 1 050 00110010 32 2 051 00110011 33 3 052 00110100 34 4 053 00110101 35 5 054 00110110 36 6 055 00110111 37 7 056 00111000 38 8 057 00111001 39 9 058 00111010 3A 059 00111011 3B 060 00111100 3C 061 00111101 3D 062 00111110 3E 063 00111111 3F 064 01000000 40 065 01000001 41 A 066 01000010 42 B 067 0100001...

Page 110: ...Q 082 01010010 52 R 083 01010011 53 S 084 01010100 54 T 085 01010101 55 U 086 01010110 56 V 087 01010111 57 W 088 01011000 58 X 089 01011001 59 Y 090 01011010 5A Z 091 01011011 5B 092 01011100 5C 093 01011101 5D 094 01011110 5E 095 01011111 5F _ 096 01100000 60 097 01100001 61 a 098 01100010 62 b 099 01100011 63 c 100 01100100 64 d 101 01100101 65 e 102 01100110 66 f 103 01100111 67 g 104 01101000...

Page 111: ...6E n 111 01101111 6F o 112 01110000 70 p 113 01110001 71 q 114 01110010 72 r 115 01110011 73 s 116 01110100 74 t 117 01110101 75 u 118 01110110 76 v 119 01110111 77 w 120 01111000 78 x 121 01111001 79 y 122 01111010 7A z 123 01111011 7B 124 01111100 7C 125 01111101 7D 126 01111110 7E 127 01111111 7F DEL Delete ...

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