AT&T 7400B Data Module
User’s Guide
555-020-707Issue 1November 1989
Page 1: ...AT T 7400B Data Module User s Guide 555 020 707 Issue 1 November 1989...
Page 2: ...pense While reasonable efforts were made to ensure that the information in this document was complete and accurate at the time of printing AT T can assume no responsibility for any errors Changes or c...
Page 3: ...ng a PC 2 12 If You Are Using a Dedicated Terminal 2 12 3 CHAPTER 3 FIRST TIME USERS Operating Modes 3 1 Essential AT Commands 3 2 Sample Command Lines 3 4 A Sample On Line Session 3 6 4 CHAPTER 4 OPE...
Page 4: ...apter 5 1 APPENDIX A AT COMMAND SET A B APPENDIX B S REGISTERS C APPENDIX C APPLICATION NOTES PBX Application Notes C 1 PC Applications Guide C 1 Procomm Plus C 2 Relay Gold C 5 Crosstalk XVI C 8 D AP...
Page 5: ...typed but they are not required The second line in the example shows a typical response returned by the data module ORGANIZATION OF THIS The following paragraphs summarize the chapters and appendices...
Page 6: ...egisters result codes factory default configuration settings EIA 232 D connector pin A glossary and an index are provided at the rear of this guide The following is a list of other manuals that may pr...
Page 7: ...7400B Data Module and a standard Digital Communications Protocol DCP interface using a type D8W modular telephone cord connects the data module to the digital PBX An internal DIP switch option allows...
Page 8: ...7400B Data Module and the separate power supply unit are described in this section The data module has a removable access panel on top of the unit which is described further in the hardware installati...
Page 9: ...the local terminal device Send Data This red LED lights when transmitted data is being transferred from the local terminal device to the 7400B Data Module Terminal Ready If the d0 option is enabled t...
Page 10: ...one line cord used to connect a telephone or voice terminal to the data module LINE This connector accepts one end of the D8W telephone cord that connects between the data module and the PBX wall jack...
Page 11: ...he POWER connector at the rear of the data module This power supply unit provides the necessary operating voltages for the data module Caution Make certain that the AC outlet to which you connect the...
Page 12: ...ace formerly RS 232 C cable to connect between the terminal device and the data module a type D8W telephone cord for Data Communications Protocol DCP connection between the Data Module LINE jack and t...
Page 13: ...INSTALLATION DEFINITY Communications System 7400B Data Module User s Guide Page 2 2 PERSONAL COMPUTER 7400B DATA MODULE D8W CORD PBX WALL JACK EIA CABLE POWER SUPPLY Figure 2 1 Typical Standalone Ins...
Page 14: ...DEFINITY Communications System CHAPTER 2 INSTALLATION 7400B Data Module User s Guide Page 2 3 Figure 2 2 Typical Installation with Telephone...
Page 15: ...CHAPTER 2 INSTALLATION DEFINITY Communications System 7400B Data Module Page 2 4 User s Guide Figure 2 3 Typical Installation with Telephone and Adjunct Equipment Requiring Auxiliary Power...
Page 16: ...evice Note Cables with the earlier RS 232 C designation will also work The most common EIA 232 D cables are supplied with a male connector at both ends If you have this type of cable and the EIA 232 D...
Page 17: ...hes on an internal 8 position DIP switch SW1 These options are described here and procedures for setting the switches are provided in a later section titled Setting the Hardware Option DIP Switches Wi...
Page 18: ...t make file transfers with the data metering option enabled A change in the setting of this option becomes effective immediately when the data module is in the idle mode or as soon as it is returned t...
Page 19: ...on about using these options refer to Chapter 4 Operation and Configuration Note The factory default settings of these switches are correct for the vast majority of applications Check the default sett...
Page 20: ...tions System CHAPTER 2 INSTALLATION 7400B Data Module User s Guide Page 2 9 To access and set the hardware option switches refer to Figure 2 4 and perform the following Figure 2 4 Accessing the Hardwa...
Page 21: ...ft the board out of its socket Locate the 8 position DIP switch on the main circuit board approximately in the center of the area exposed by the access opening Set the appropriate positions of this DI...
Page 22: ...ork see Setting the Hardware Option Switches in this chapter Also if your voice terminal has data capabilities the data features of the voice terminal are not supported while it is connected to the 74...
Page 23: ...tain options have been changed the operation of the LEDs may differ from this description Your 7400B Data Module is now installed and ready for data communications operation IF YOU ARE USING A PC Revi...
Page 24: ...u type on your keyboard as a command In on line mode the data module passes everything on as data While in on line mode typing a specific character three times in quick succession the factory default...
Page 25: ...a basic description of the most commonly used AT commands These few commands are all you will need for completing many data communications tasks In a later section titled Sample On Line Session presen...
Page 26: ...ing a space between the AT prefix and the next command on the line is optional but do not separate the two letters AT with a space D A The Dial command This command follows the AT and precedes the num...
Page 27: ...in effect OK should be returned O The return to On line command After using the escape sequence to enter command mode you can type ato and press Enter to return to on line mode Note This command will...
Page 28: ...r PBX domain with a few other options thrown in at f d 9 555 1212 Enter BUSY In the first line of this example at is the required command prefix f tells the data module to restore the factory default...
Page 29: ...The following is a sample data call to a fictitious bulletin board service If you know the number of a real bulletin board service you might try an actual log on by using that number and following the...
Page 30: ...or the suggested remedy does not seem to solve the problem and then you will need to consult the documentation for your dedicated terminal or for your PC and any software involved Disconnecting a Data...
Page 31: ...wo stored and one that permanently contains the factory default values Unsaved changes to configuration parameters remain in effect until they are changed again or until the data module is disconnecte...
Page 32: ...s the desired profile and may be 0 or 1 at yn Enter Recall one of the two stored configuration profiles into active status when the data module is powered on where n represents the desired profile and...
Page 33: ...ta Module except the escape sequence and the repeat command must begin with the letters AT This is called the command line prefix and must be entered as either both uppercase or both lowercase letters...
Page 34: ...annot delete the AT prefix once it is typed The factory default backspace character is an ASCII backspace represented by the decimal number 008 which is stored in S register S05 Note A special applica...
Page 35: ...ted by the X command controls which of these result codes may appear on the screen of your terminal the X command is described in Appendix A All result codes that may be returned by the 7400B Data Mod...
Page 36: ...mands to the data module As long as the data call has not been disconnected you can use the O command to return to on line mode One other condition will cause the data module to switch from data mode...
Page 37: ...ix and without pressing Enter This command is most useful when you have typed a command line to have the 7400B Data Module dial a number and the data module returns the result code BUSY Use the A comm...
Page 38: ...r example at z2 Enter deletes any number that may have been stored in number storage location 2 Dial the number stored in location m which is one of four locations designated by the numbers 0 through...
Page 39: ...rding to the EIA standard D2 sets the data module to go on hook when an on to off transition is detected on the Data Terminal Ready DTR input disconnecting the call Q1 turns off the result codes that...
Page 40: ...tions System 7400B Data Module Page 4 10 User s Guide A second command allows you to recall the factory default configuration if for instance you loose track of changes you have made and need to start...
Page 41: ...riptions is offered Select the one that best describes the observable condition or try each suggestion in turn until the trouble has been corrected Perform the task described in the Solution column In...
Page 42: ...administered for the 7400B Data Module Characters typed on If the SD LED does not Connect or replace the EIA 232 D keyboard are not flash when keys on the cable between the data module and displayed...
Page 43: ...to the highest speed available The 7400B Data Module cannot communicate with a far end device that is operating half duplex or synchronous This problem can be resolved only if the far end device can...
Page 44: ...hang up command From command mode type the command to set the DTR lead option to disconnect on DTR lead transition from on to off Alternatively determine and use the command provided by the communicat...
Page 45: ...automatic answer option is enabled the AA and TR LEDs are lit but the POWER TEST lamp is flashing indicating that the data module is in a local loopback test mode From the command mode type ats0 1 En...
Page 46: ...file transfer with metering option to off see PC data communication Setting the Hardware Option DIP software Switches in Chapter 2 re establish the call and try the file transfer again The DATA LED is...
Page 47: ...0 bps data module does not Data Module respond to any command The CONNECT message The data module is Configure the data module to send is sent without a speed configured to display only CONNECT nnnn m...
Page 48: ...iate or configuration An immediate command causes the data module to perform an action as soon as the command is sent for example go off hook or dial a number A configuration command modifies a config...
Page 49: ...n of the example and any other information about the command not provided elsewhere is provided here Additional commands may be typed on the same command line with the command currently under discussi...
Page 50: ...ed you can return to the on line mode with the O command This is one of the two commands that does not require the AT prefix A is the other one and it is never followed by pressing Enter The value in...
Page 51: ...f S0 and S1 are ignored when this command is issued Command D Chapter 3 First Time Users Chapter 4 Operation and Configuration Appendix B S Registers Command Function Type Arguments S Register Example...
Page 52: ...command line atdtTEXAS Enter The t following the D command will be discarded and the string TEXAS will be sent to the PBX as a dial mnemonic the PBX must be administered to recognize this mnemonic as...
Page 53: ...tring until the call is either completed or fails If anything is typed before the call is completed the call will fail See Also Chapter 3 First Time Users Chapter 4 Operation and Configuration Command...
Page 54: ...No argument or an argument of 0 causes the data module to go on hook none The H command with no argument can be used during a data call to cause the 7400B Data Module to go on hook hang up after using...
Page 55: ...ed 2 The data module displays OK followed by a carriage return and line feed S Register none Example ati0 Enter Comments In the example the 7400B Data Module will return its product ID code as the val...
Page 56: ...an AT command is issued Chapter 4 Operation and Configuration result codes in either Chapter 4 or Appendix D Summary Tables the V and X commands in this appendix Command V Function Select format for r...
Page 57: ...and 14 are enabled No dial tone S Register Example Comments detection Busy signal detection enabled Speed indication on connect 4 Result codes 0 7 10 12 and 14 are enabled Blind dialing capability is...
Page 58: ...an argument of 0 recalls the configuration profile stored in location 0 an argument of 1 recalls the configuration profile stored in location 1 S Register none Example atz1 Enter Comments In the exam...
Page 59: ...the EIA 232 D standard S Register Example Comments Bit 5 of S21 is set according to the argument used with the C command at c1 Enter In the example the DCD circuit operates according to the EIA 232 D...
Page 60: ...connected 3 perform a reset if an on to off transition is detected on the DTR input an active data call is disconnected Bits 3 and 4 of S21 are set according to the option used with the D command In t...
Page 61: ...DSR options Type configuration Arguments The S command accepts one of two arguments as follows 0 or no argument the DSR circuit is maintained on at all times factory default setting 1 the DSR circuit...
Page 62: ...al digital loopback test with self test S Register Example Comments Bits 0 and 2 6 of S16 are set according to the argument used with the T command at t3 Enter see comment 1 1 2 3 In the example a loc...
Page 63: ...n configuration profile locations 0 and 1 contents of the four telephone number storage locations Chapter 4 Operation and Configuration ACTIVE PROFILE B1 E1 L2 M1 Q0 V1 X4 Y0 C0 D0 G0 J0 L0 P0 Q0 R0 S...
Page 64: ...e actually stored Chapter 4 Operation and Configuration Appendix B S Registers Command Y Function Designate the default configuration profile Type configuration Arguments An argument of 0 will recall...
Page 65: ...one of four arguments 0 through 3 which designates the memory location in which the dialing string that follows the command will be stored S Register none Example at z2 555 1212 Enter Comments In the...
Page 66: ...k at the contents on just one register use the command Smm where mm is the number of the S register To change the value in any one S register directly use the command Smm nnn where mm is the number of...
Page 67: ...ble in Appendix D Quick Reference Summaries a two digit hexadecimal number used to represent the contents of a bit mapped S register Bit mapped S registers are not usually set by entering a complete v...
Page 68: ...tten to storage Note Any changes to non storable S registers are lost when power is removed from the Data Module however the Y command can be set to load a specific stored configuration profile at sta...
Page 69: ...answering The count of incoming rings is stored in S register S1 See Also Chapter 4 Operation and Configuration S register S1 Register S1 Description The number of incoming rings detected Incremented...
Page 70: ...command mode The operation of the Data Terminal Ready DTR circuit set by the D command can still be used to move to command state without disconnecting the call Chapter 4 Operation and Configuration A...
Page 71: ...ration Register S5 Description This S register holds the ASCII value for the backspace character Range of Value may be 000 through 032 and 127 factory default value is 008 Values usually output by the...
Page 72: ...Chapter 4 Operation and Configuration Register S8 not used Register S9 not used Register S10 Description The value in this S register determines how long the 7400B Data Module will wait after loss of...
Page 73: ...equence guard time It also determines the maximum interval allowed between entering each of the three consecutive characters of the sequence Range of Value may be 000 through 255 fiftieths 0 02 of a s...
Page 74: ...ment 1 bit 6 not used always set to 0 bit 7 0 originate mode 1 answer mode default 1 see A and Range of Values Storable Comments D commands Value may be 00 to FF hexadecimal factory default settings p...
Page 75: ...ess default 0 see T6 command bit 5 remote digital loop with self test 0 disabled 1 in progress default 0 see T7 command bit 6 local digital loop with self test 0 disabled 1 in progress default 0 see T...
Page 76: ...t value is Values 0 Storable yes Comments Any locally initialized test in progress is automatically terminated when the time specified in S register 18 has elapsed If S register 18 is set to 0 a test...
Page 77: ...232 D standard default 0 see C command bit 6 DSR options 0 always on 1 EIA 232 D standard default 0 see S command bit 7 not used default 0 see comment 1 Range of Values Storable Comments Value may be...
Page 78: ...efault 0 see X command bit 7 not used default 0 see comment 1 Range of Value may be 00 to FF hexadecimal factory default settings produce a Values value of 76 hexadecimal see comment 2 Storable yes Co...
Page 79: ...pace 2 odd and 3 mark none default 0 bit 6 and 7 not used see comment 2 Range of Values Storable Comments Value may be 00 to FF hexadecimal factory default settings produce a value of 07 hexadecimal s...
Page 80: ...on the Data Terminal Ready DTR lead must persist before it is acknowledged If the change of state persists for a shorter time than is specified in S register 25 it is ignored Range of Values may be 00...
Page 81: ...re packages for use with the 7400B Data Module The following application notes are used for administering AT T PBX systems to recognize the 7400B Data Module AT T DEFINITY Communications System Generi...
Page 82: ...Select Modem Options Check that the options displayed on your screen match those in the 2 3 4 5 menu below Change any options that do not match A B ATDT C M D ATH0 M E PROCOMM PLUS SETUP UTILITY MODE...
Page 83: ...ption to change Esc Exit F G H I J 9 When you are finished press Esc twice to return to the MAIN 10 MENU of the PROCOMM PLUS SETUP UTILITY Select Save Setup Options Press Esc to return to the Terminal...
Page 84: ...VT102 I PORT COM1 SETTINGS 2400 N 8 1 DUPLEX FULL DIALING CODES BAUD P D S D 2 Use the up and down arrow keys to select an unused entry line 3 4 5 6 Press R to select Revise Entry Following the examp...
Page 85: ...martmodem 2400 are appropriate for the 7400B Data Module 4 Select the default communication port and speed that will be used most frequently 5 Enter a selection for 3270 emulation board type or leave...
Page 86: ...3 4 Press Tab to move to the speed field and type 2400 Press Tab to move to the type field and type vt100 5 6 Press F4 to display the Review Connect Options for Computer Named screen as shown below R...
Page 87: ...odule to dial the system 10 Disconnecting a Call 1 Press Esc to return to the ONLINE menu as shown below RELAY Gold Your PC ID is relay gold ONLINE F1 Return to Terminal Screen Alt F1 Redial or Reansw...
Page 88: ...DUplex DAta 8 S TOP 1 EMulate None TAbex Off BLankex Off POrt 1 MOde Call INfilter On OUtfiltr On Key settings SEnd control settings I I I II ATten Esc SWitch Home COmmand ETX C CWait None BReak End...
Page 89: ...WUSER script file 1 Enter the number next to the command file NEWUSER shown on your Status screen Enter the letter next to the service you want to call or enter O for Other Service not listed above Se...
Page 90: ...cting a Call a b c d e f g Enter the telephone number for example 18006245123 or 9 18006245123 Enter the system name you are calling for example ATTMAIL Enter the baud rate for example 300 1200 2400 E...
Page 91: ...S 7400B Data Module User s Guide Page D 1 APPENDIX D QUICK REFERENCE SUMMARIES This appendix contains quick reference summaries for the following data AT Command Set S Registers Result Codes Factory D...
Page 92: ...ROM checksum as two 4 digit hexadecimal numbers I2 Returns OK O Return to on line mode Q0 Enable display of result codes Q1 Disable display of result codes Sr Set pointer to S register r Sr n Set S r...
Page 93: ...ation Terminate any test in progress Initiate local digital loopback test Same as T1 Initiate local data loopback test Allow remote digital loopback request from remote endpoint Deny remote digital lo...
Page 94: ...1 055 sec S8 Not used S9 Not used S10 Delay between lost line signal and hang up 000 255 0 1 sec S11 Not used S12 Escape sequence guard time 000 255 0 02 sec S13 Not used S14 Bit mapped options see Ap...
Page 95: ...4 5 6 7 1 0 11 12 14 Command accepted Connection made at 300 bps Note If command X1 is in effect CONNECT means connection made at whatever speed both ends of the call agreed upon Ring signal detected...
Page 96: ...0 Q0 profile 0 Y0 always on C0 always on S0 DTR ignored D0 Not used by 7400B Data Module G0 Not used by 7400B Data Module Y0 Not used by 7400B Data Module P0 RDL request Result codes Result code forma...
Page 97: ...6 Not used by 7400B Data Module S8 2 Not used by 7400B Data Module S11 95 DTR detection 0 05 sec S25 5 Escape sequence character ASCII 43 S2 43 Escape sequence guard time 1 sec S12 50 Hang up after l...
Page 98: ...data set ready 7 AB SG common signal ground 8 CF RLSD from 7400B receive line signal detector 9 not used 10 not used 11 not used 12 CI from 7400B data signal rate select 13 not used 14 not used 15 no...
Page 99: ...LF VT FF CR SO SI DLE DC1 DC2 DC3 DC4 NAK SYN ETB CAN EM SUB ESC FS GS RS US Ctrl Ctrl A Ctrl B Ctrl C Ctrl D Ctrl E Ctrl F Ctrl G Ctrl H Ctrl I Ctrl J Ctrl K Ctrl L Ctrl M Ctrl N Ctrl O Ctrl P Ctrl...
Page 100: ...6 077 078 079 080 081 082 083 084 085 086 087 088 089 090 091 092 093 094 095 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z j ASCII CONTROL KEY VALUE CHARACTER 096 097 098 099 100 101 102 103 10...
Page 101: ...ed for configuration and operation of DCE devices or modems The AT Attention command set originated with Hayes Microcomputer Products Inc The AT T 7400B Data Module uses a subset of the full AT comman...
Page 102: ...otter DCE See Data Communications Equipment DCP See Digital Communications Protocol Dial modifier Any character that may be inserted in a command line following the D dial command See D command in App...
Page 103: ...to interpret them as commands Also called data mode See also command mode Option profiles See configuration profiles Script files See command files Standalone mode A DIP switch selected operating mod...
Page 104: ...1 5 4 I A 7 O A 8 3 4 4 6 5 1 5 6 prefix 2 12 3 1 4 3 Q A 9 4 5 5 1 5 6 S A 4 S A 14 S 4 7 S 5 2 Smm B 1 snn 5 5 summary D 2 T B 10 A 14 INDEX V B 2 V A 9 4 5 5 6 V A 15 4 2 W A 17 4 2 4 9 X A 10 4 5...
Page 105: ...12 Installation hardware 2 7 requirements 2 1 L LEDs 1 2 5 2 AA 1 3 5 5 CHECK SPEED 1 3 5 3 DATA 1 3 5 2 5 4 5 6 DATA METERING 1 3 OH 1 3 POWER TEST 1 3 5 2 RD 1 3 5 2 SD 1 3 5 2 TR 1 3 5 5 Local mode...
Page 106: ...ipt files 2 6 4 2 Software data communications 2 5 2 12 4 2 Speed 1 1 3 2 5 3 5 6 5 7 S registers B 1 4 1 4 7 registers S0 B 4 S1 B 4 S10 B 7 S12 A 3 B 8 S14 A 3 A 5 A 6 A 9 S16 B 9 A 14 S18 B 10 S2 A...
Page 107: ...ember 1989 Please disregard the earlier memo containing errata sheets for the same document The sheets attached to this memo replace any and all errata sheets The attached errata sheets contain U L Sa...
Page 108: ...rk While unlikely it is possible that this spark could ignite heavy concentrations of gas Never push objects of any kind into this telephone through housing slots as they may touch hazardous voltage p...
Page 109: ...uct If the product has been exposed to rain or water If the product does not operate normally by following the operating instructions Adjust only those controls that are covered by the operating instr...
Page 110: ...or terminals unless the telephone line has been disconnected at the network interface Use caution when installing or modifying telephone lines WARNING RISK OF ELECTRIC SHOCK EQUIPMENT MUST BE PROPERL...
Page 111: ...ured from Phase to Ground should be 110 to 125 VAC 3 The voltage measured from Neutral to Ground should be less than 1 VAC If the receptacle is not a properly grounded 3 prong type stop the installati...
