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Appendix J - RS-232C Interface Specifications

External Transmit Clock - Pin 24, XTC

Direction: to modem

Supplies the same function as transmit clock on Pin 15.

Terminal Busy (Out of Service) - Pin 25, OOS

Direction: to modem

The Terminal Busy (OOS) circuit is not defined in the RS-232C standard, but is used by us and most
manufacturers to make the phone lines busy to incoming phone calls. Pin 25 is not normally
connected to the RS-232C interface when shipped from the factory; it can be ordered connected as
an option. If pin 25 is connected and is brought high, the modem will be placed Off Hook, and busy to
incoming calls.

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Summary of Contents for BL-Series

Page 1: ...BL Series Intelligent Data Fax Modem User Guide...

Page 2: ...ny person or organization of such revisions or changes Record of Revisions A 6 1 99 Manual formatted for electronic distribution All pages at Revision A Trademarks of Multi Tech Systems Inc are as fol...

Page 3: ...2 3 Loading Trio DataFAX Software 24 2 4 Is Your Modem Ready for Use 26 Chapter 3 Software Configuration and Modem Basics 3 1 Introduction 28 3 2 Serial Port Limitations 28 3 2 1 How Can You Identify...

Page 4: ...mmands 56 5 4 6 Phone Line Conditioning Commands 58 5 4 7 RS 232C Interface Control Commands 61 5 4 8 Error Correction Commands 63 5 4 9 Flow Control Commands 66 5 4 10 Compression Error Correction Fl...

Page 5: ...tion 118 10 2 Limited Warranty 118 10 2 1 On line Warranty Registration 118 10 3 Tech Support 119 10 3 1 Recording Modem Information 119 10 4 Service 119 10 5 The Multi Tech BBS 120 10 5 2 Upgrading t...

Page 6: ...vi...

Page 7: ...Chapter 1 Introduction and Description...

Page 8: ...ed site The information contained in each chapter and appendix is as follows Chapter 1 Introduction and Description This chapter begins with a short introduction followed by a guide which you are now...

Page 9: ...Local Analog Loopback Digital Loopback and Remote Digital Loopback Tests We have included a description of each test and how to use each test procedure Chapter 9 DIP Switches Chapter 9 covers the mode...

Page 10: ...wire leased line networks with the addition of dial backup capability With this capability the dial up feature saves any down time if the leased line fails Since the MT2834BL operates according to IT...

Page 11: ...L is AT command set compatible and incorporates a number of capabilities beyond the basics of V 32bis operation Other capabilities include CCITT V 25bis synchronous dialing compatibility with CCITT V...

Page 12: ...ries Serial binary asynchronous at 0 300 1200 2400 4800 7200 9600 12 000 14 400 16 800 19 200 bps synchronous at 1200 2400 4800 7200 9600 12 000 14 400 16 800 19 200 bps 1432 Series Serial binary asyn...

Page 13: ...utodial redial repeat dial dial linking pulse or tone dial dial tone detection dial pauses call status display auto parity and data rate selection keyboard controlled modem options nonvolatile memory...

Page 14: ...nate 1200 Hz Transmit Answer 2400 Hz Receive Originate 2400 Hz Receive Answer 1200 Hz Carrier Frequencies 300 bps Bell Standard All models 1270 Hz Mark 1070 Hz Space for Transmit Originate 2225 Hz Mar...

Page 15: ...s All models LEDs for Transmit Data Receive Data Carrier Detect Speed Indicators Off Hook Terminal Ready Error Correction Fax and Error Controls All models Toggle switches for Voice Data with Originat...

Page 16: ...1c MT1432 LED Display SD Send Transmit Data This LED blinks when data is being transmitted on for a space off for a mark The state of this LED matches the TD circuit on Pin 2 of the RS 232C V 24 inter...

Page 17: ...The state of the TR LED matches that of the DTR circuit on Pin 20 of the RS 232C V 24 interface EC Error Correction This LED is lit when the modem is set for V 42 error correction and flashes on and...

Page 18: ...18 MultiModemBL User Guide...

Page 19: ...Chapter 2 Installation and Connection...

Page 20: ...Figure 2 1 Unpacking MT2834BL shown Your package should include MT2834BL MT1932BL or MT1432BL data fax modem RJ 11 telephone cord or BS 6312 Plug UK models AC Power Transformer One 1 Quick Start Guide...

Page 21: ...cal connections required to make your modem operational Software loading is covered later in this guide Note There are two procedures in this section The first details cabling for domestic BL and inte...

Page 22: ...nto the PHONE connector on the modem and plug the other end into your telephone Refer to Figure 2 2 6 Attach the AC Power transformer provided with your unit to the POWER connector on the modem and to...

Page 23: ...work 2 Verify that the ON OFF switch at the rear of the modem to the OFF Down position 3 Connect the modem to either a dial up line or lease line To connect the modem to a dial up phone line attach th...

Page 24: ...proceed with the default language English or select the desired language and click Next to proceed 3 Click Next to proceed with the default country United States or select the country in which you are...

Page 25: ...d 11 Click Next Dialog and follow the on screen instructions to load the software Once the software has finished loading the following dialog is displayed 12 Choose Manual Selection of Modem and Ports...

Page 26: ...ations program group and then click the Exit icon on the installation screen to exit the installation program 2 4 Is Your Modem Ready for Use As soon as you have connected power to the modem if you ar...

Page 27: ...Chapter 3 Software Configuration and Modem Basics...

Page 28: ...ly up to a maximum of 115 200 bps If your serial port cannot handle these speeds we recommend that you replace your present serial card with one that has a 16550AFN UART or equivalent Macintosh comput...

Page 29: ...Your Software Communications software must be configured to work with your modem your computer and the remote system it is calling Fortunately most communications programs make the process easy by pro...

Page 30: ...wer after the first ring and try to communicate with a modem on the other end of the line If you have one telephone line for voice fax and modem communications the modem may attempt to answer all inco...

Page 31: ...with another modem When V 42bis data compression is enabled you must have a serial port baud rate four times the transmission speed of the modem to fully optimize compression So if your UART is fast...

Page 32: ...ng as follows AT F S0 0 X4 E14 M As a general rule you should try to transmit files in already compressed form rather than relying on V 42bis hardware compression Because software compression is more...

Page 33: ...k whether your modem is operational If everything s fine your modem will respond OK Note refer to Chapter 4 for additional details on Dialing Automatic Answering Dial Back Up and Automatic Leased Line...

Page 34: ...34 MultiModemBL User Guide...

Page 35: ...Chapter 4 Manual Dial and Automatic Answer...

Page 36: ...may be entered in upper or lower case Entering AT automatically sets the modem s speed to match the speed of the computer or terminal and also sets the modem s parity The AT characters alert the modem...

Page 37: ...omatic answer end of the line to cause the answering modem to disconnect after toggling off procedures 4 5 Dial Backup and Leased Line Restoral The dialing associated with the MultiModem when in lease...

Page 38: ...our modem in Synchronous mode the Command mode is disabled so you must automatically dial your calls with a telephone set To use manual dialing you first connect an ordinary telephone set either touch...

Page 39: ...ter five or six rings which gives you time to answer it manually if you wish See Chapter 6 for S Register information 4 9 Manual Answering We have shown that the modem can automatically answer incomin...

Page 40: ...Call Termination There are a number of ways to terminate a call or simply stated hang up They are 1 Command Mode Control To terminate a call by Command Mode enter ATH then RETURN or send a BREAK signa...

Page 41: ...Chapter 5 Command Mode...

Page 42: ...e changed to any other ASCII character with S Register S5 If you wish to cancel an entire command that has been entered but not yet executed enter CTRL X This also clears the command buffer The effect...

Page 43: ...ons the call and re enters Command mode Once on line the modem exits On line mode if one of two conditions is met If the carrier is lost or intentionally dropped the modem hangs up and re enters Comma...

Page 44: ...erse Mode of Operation Flash On Hook AT T Calling Card Tones Quiet Answer MEMORIZE PHONE NUMBERS D N Store Phone Numbers NN Number Linking L List Numbers Stored in Memory STORE MODEM F Load Factory De...

Page 45: ...iple Xoff Characters E8 Enq Ack Off E9 Enq Ack On E10 Normal Mode Modem Flow Control Off E11 Normal Mode Modem Flow Control On E12 Computer Initiated Off E13 Computer Initiated On BS Maximum Block Siz...

Page 46: ...Display of Noise Information RP Initiates Retrain to Read Line Probe Parameters READ AND Sr Read Current S Register Value ASSIGN Sr Assign S Register Value S REGISTER VALUES REMOTE CBN Passwords for C...

Page 47: ...t codes generated by the Q command refer to Appendix G for Result Code Summary Multi Tech Result Codes 2834 Series TERSE VERBOSE TERSE VERBOSE 0 OK 11 CONNECT 4800 1 CONNECT 12 CONNECT 9600 2 RING 13...

Page 48: ...SWER 31 CONNECT 31200 9 CONNECT 2400 33 CONNECT 33600 1932 Series TERSE VERBOSE TERSE VERBOSE 0 OK 8 NO ANSWER 1 CONNECT 9 CONNECT 2400 2 RING 11 CONNECT 4800 3 NO CARRIER 12 CONNECT 9600 4 ERROR 13 C...

Page 49: ...ng see X3 or X4 command you can command the modem to continuously redial up to 10 re dials for DOC units a busy number until your call is answered This is done with the A command This command would be...

Page 50: ...ods Pulse dialing is a method used by rotary dial telephones which involves the timed opening and closing of line relay Tone dialing is the method used by push button touch tone telephones and is some...

Page 51: ...tomatically In order for this command to work you must select Wait For Dial Tone dialing with the X2 or X4 command so that your modem will be able to detect the dial tone Return to Command Mode After...

Page 52: ...1028806127853500 123456789 access phone number credit card number Quiet Answer The command causes the modem to wait before processing the next symbol in the dialing string The wait is for one or more...

Page 53: ...er automatically if the first number dialed is busy This would be useful in a situation where a computer can be accessed through more than one phone number This is called linking To link the number in...

Page 54: ...F command The modem is shipped from the factory with a pre configured set of command and S Register default settings This set of factory defaults can be recalled by issuing the F command In addition t...

Page 55: ...e modem defaults to M0 asynchronous communications on reset or power up Synchronous Transmit Clock Select X The X command selects the Synchronous Transmit Clock Source in conjunction with DIP Switch 1...

Page 56: ...the No Response Answer mode ATQ2 selects the No Response Answer mode If you do not select any mode the factory default setting enable Result Codes is automatically selected Result Codes Multi Tech or...

Page 57: ...This capability smart dialing allows the modem to wait for a dial tone and when one is detected to begin dialing immediately The modem also can detect a distant busy signal if after dialing it reaches...

Page 58: ...s not used in BLK models Phone Line Monitoring Speaker M The modem has an internal on board speaker which functions like the speaker in a telephone handset to enable you to monitor phone line activity...

Page 59: ...K to 31 2K to 28 8K to 26 4K to 24K to 21 6K to 19 2K to 16 8K to 14 4K to 12K to 9 6K to 4 8K bps 1932 Series 19 2K to 16 8K to 14 4K to 12K to 9 6K to 4 8K bps 1432 Series 14 4K to 12K to 9 6K to 4...

Page 60: ...19 200 bps with fallback to 14 400 to 9600 to 4800 to 2400 to 1200 and to 300 bps 1432 Series 14 400 bps with fallback to 9600 to 4800 to 2400 to 1200 and to 300 bps Entering AT A1 causes 2834 Series...

Page 61: ...functions DTR can be used to trigger a dialing sequence called DTR Dialing The condition of DTR can also be used to cause the modem to reset to its default parameters just as if you had given the mode...

Page 62: ...rop time to be something other than one second use S Register S24 to change this value Refer to Chapter 6 CTS RTS Interaction Control RF In typical operation Clear to Send follows Request to Send when...

Page 63: ...oes through normal handshaking procedures just like any dial up modem After establishing the on line connection the modem transmits a Link Request message to the answering modem The Link Request messa...

Page 64: ...M error correction and disables MNP This command is for Originate mode only Answer mode still accepts MNP or LAP M L3 Command In the prior commands the modems use a two phase process to establish a V...

Page 65: ...URN received The factory default is F0 Retransmit Count R If errors are received during a Reliable connection the modem re sends the block of data which contained an error With the R0 command if anoth...

Page 66: ...tiated Flow Control Pacing RS 232 V 24 Computer or Terminal Modem Data Flow Figure 5 2 Flow Control and Pacing Hardware Flow Control E4 With Hardware Flow Control the modem uses its RS 232C interface...

Page 67: ...used to control the flow of data between the modems Flow Control can be turned on or off with the Normal Mode Modem Flow Control commands When the modems are connected in Reliable mode a different me...

Page 68: ...or the modem to be set for Pacing On a modem initiated method of flow control must be previously selected Once this is done the modem will respond to either Xon Xoff commands or to the toggling of the...

Page 69: ...dem responds to Xon Xoff characters but does not allow Xon Xoff characters to pass through to remote site E7 Modem responds to Xon Xoff characters and allows them to pass through to remote site X0 Sel...

Page 70: ...Speed Conversion ON enter the command AT BA0 and hit RETURN To turn Speed Conversion OFF enter AT BA1 and hit RETURN The modem will now match its RS 232C speed to that of the computer and will adjust...

Page 71: ...0 2400 bps AT MB4800 4800 bps AT MB9600 9600 bps AT MB14400 14400 bps AT MB19200 19200 bps The factory default is 19200 bps 1432 Series AT MB75 CCITT V 23 AT MB300 300 bps AT MB1200 1200 bps AT MB2400...

Page 72: ...d remains the same This provides you with a convenient way to switch the serial port speed and still make it easy to go back to the original speed automatically the next time the modem is powered up o...

Page 73: ...ntered the modem responds with MT2834BL MT1932BL or MT1432BL depending on model Windows 95 Autodetect Inquiry I9 2834 Series only This read command permits a Windows 95 operating system to query the M...

Page 74: ...xecutes the command if any and then remain in Command mode For example to hang up the modem at the end of a call enter ATH and hit RETURN There is no need to incorporate pauses before and after the pl...

Page 75: ...assed between the modems to identify impairments in the telephone channel e g Receive Signal Strength vs Frequency Noise vs Frequency and Signal to Noise Ratio vs Frequency After receiving the results...

Page 76: ...76 MultiModemBL User Guide...

Page 77: ...Chapter 6 S Registers...

Page 78: ...first ring The maximum number of rings that can be configured is 255 Setting the value to zero 0 disables auto answer completely S1 Rings Which Have Occurred Unit 1 ring Range 0 255 Default 0 Descrip...

Page 79: ...5 55 Description S7 defines the Abort Timer lack of carrier delay time The default value is 45 seconds Decimal 45 This means that after dialing the modem waits for a carrier signal for up to 45 second...

Page 80: ...e Dialing Tone Spacing and Duration Unit 1 mSec Range 1 255 80 255 80 255 Default 70 80 80 Description S11 sets the speed of tone dialing spacing and tone duration times The default value is 70 units...

Page 81: ...ged in 10 mSec increments by increasing or decreasing the value of S17 S18 Automatic Leased Line Restoral Unit 1 minute Range 10 255 Default 30 minutes Description When the modem is in dial backup mod...

Page 82: ...onds or more This dropout time can be increased up to a maximum of 25 5 seconds The S25 unit value for zero is the default value of 50 mSec For values from 1 through 255 the unit value is 100 mSec S26...

Page 83: ...es before the escape sequence is employed by hitting RETURN the escape sequence is aborted The default is 20 units S34 Buffer Length of Command Mode After On line Escape Sequence Unit ASCII Character...

Page 84: ...scription Defines which speed modem connects within the scope of Enhanced V 34 mode e g S48 26 means maximum connect speed is 26 4K This register compensates for line conditions that have trouble supp...

Page 85: ...pauses five seconds for a comma in a dial command 2 In a second example let s say that you wish to configure the modem to answer incoming calls after the 30th ring instead of after the first ring To c...

Page 86: ...or AT W causes the modem to store its current parameters in its nonvolatile RAM The command also sets the modem upon power up or when it is reset with an ATZ command the modem reads all of its configu...

Page 87: ...Chapter 7 Callback Security and Remote Configuration...

Page 88: ...rotects your network from unauthorized access and helps control long distance costs By use of Callback Passwords and dial back phone numbers you can have your modem dial back remote locations immediat...

Page 89: ...s to the features used for configuring the modem Because the defaults are in the modem owner s manual and anyone can find out what they are you should change the codes as the first step of your initia...

Page 90: ...ollowing AT Ixxxxxxxxxx CR xxxxxxxxxx from Table 7 1 Enter your modem s Setup Password as selected in Table 7 1 by entering the following AT Syyyyyyyyyy CR yyyyyyyyyy from Table 7 1 2 Enable the Callb...

Page 91: ...dem s Setup Password as selected in Table 7 1 by entering AT Syyyyyyyyyy CR yyyyyyyyyy from Table 7 1 Table 7 3 Callback Operational Sequence Procedures Perform the following steps when dialing into a...

Page 92: ...de 2 COMMAND Mode 2 You then select 1 or 2 With 1 the modem goes back into data mode and with 2 the modem responds with the following Password 3 Enter your Setup Password and if the code is correct th...

Page 93: ...ack security by typing AT DB1 or AT DB2 and pressing CR If you want to engage both remote and local password security use the DB1 command This sets up the modem so you have to provide passwords to dia...

Page 94: ...Guide Erase Callback Password RCBNxx This command erases the single callback password specified by xx 0 through 29 Erase Callback Phone Number RDNxx This command erases the single phone number specifi...

Page 95: ...f Callback attempts after initial passwords have been exchanged between modems Unit 1 Attempt Range 1 255 Default 4 Failed Password Attempts S26 S26 counts the number of times there has been a failed...

Page 96: ...96 MultiModemBL User Guide...

Page 97: ...Chapter 8 Modem Testing...

Page 98: ...e modem s transmitter and receiver circuits are functioning properly The Digital Loopback Test local manual allows you to verify that the remote computer or terminal the remote modem serial ports the...

Page 99: ...message if responses are enabled enter data from your keyboard For this test typing multiple upper case U characters is a good way to send an alternating test pattern of ones and zeros 4 For a more co...

Page 100: ...e AT and hit ENTER you should get an OK message 2 Dial the remote modem by entering the Dial command and the phone number to establish On line mode 3 Type the Escape Sequence AT CR or BREAK AT CR whic...

Page 101: ...l the remote modem by entering the Dial command and the phone number to establish On line mode Note The T4 command must be set on the remote modem to run this test Computer or Terminal Local MultiMode...

Page 102: ...itch 5 UP and the other modem to Originate enabled DIP Switch 5 DOWN Note it does not matter which modem local remote is set to Answer Originate just so they are set opposite 6 Set DIP Switch 3 UP on...

Page 103: ...onous mode You then compare the test characters multiple upper case U characters in Figure 8 5 on your monitor with the characters you typed If the characters don t match check your computer s COM por...

Page 104: ...certain that you are set up for Synchronous operation by placing DIP Switch 12 in the UP position To initiate the Digital Loopback Test local manual DIP Switch 9 must be in the UP position and the An...

Page 105: ...modems If that test is successful the problem may be the phone lines First make certain that you are set up for Synchronous operation by placing DIP Switch 12 in the UP position To initiate the Digit...

Page 106: ...106 MultiModemBL User Guide...

Page 107: ...Chapter 9 DIP Switch Settings...

Page 108: ...s the modem s printed circuit board options Sixteen DIP Switch settings and the modem s speaker volume control are explained in detail including all default settings Phone Jack Dial up Jack Lease Line...

Page 109: ...trol method Xon Xoff characters in the data dictate the start and stop of data flow from the computer or terminal Place DIP Switch 2 in the DOWN position to select Xon Xoff Flow Control Hardware Flow...

Page 110: ...ch 7 must be placed in the UP position This establishes an RTS CTS condition state typical for an IBM5853 modem in half duplex mode Next place DIP Switch 4 in the DOWN position This spoofs the modem i...

Page 111: ...ory Default Setting UP Switch 6 Maximum Throughput Setting Asynchronous Mode Leased Line Dial Up Some applications require you to dial into services with maximum throughput on and other applications w...

Page 112: ...able Command mode The factory default setting is Command mode enabled Disable Command Mode Switch 8 UP Enable Command Mode Switch 8 DOWN Factory Default Setting DOWN Switch 9 Digital Loopback Test Asy...

Page 113: ...ion Sync Asynchronous Synchronous Mode Leased Line Dial Up The modem can operate in either Asynchronous mode or Synchronous mode In Synchronous mode start and stop bits are eliminated The modem s inte...

Page 114: ...s it is advisable to force these two signals On in order for the terminal to communicate properly with the modem in Command mode This is done by setting DIP Switch 15 DOWN With DIP Switch 15 in the UP...

Page 115: ...Lease Line DOWN 4 UUCP Enable Disable UP Async Dial Up Leased Line DOWN 4 AS 400 Enable Disable UP Sync Dial Up Leased line DOWN 5 Auto Answer Enable Disable UP Async Sync Dial Up DOWN 5 Answer Origi...

Page 116: ...9600 bps Operation 1932 Series SWITCH CONDITION EFFECT 13 14 UP UP 19 2 K bps Operation 13 14 DOWN UP 14 4 K bps Operation 13 14 UP DOWN 9600 bps Operation 13 14 DOWN DOWN 2400 bps Operation 1432 Seri...

Page 117: ...Chapter 10 Warranty Service and Tech Support...

Page 118: ...EXPRESSED OR IMPLIED AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED This warranty does not apply to any products which have been damaged by l...

Page 119: ...he status of your modem before calling tech support This status can include LED indicators screen messages diagnostic test results problems with a specific application etc Use the space below to note...

Page 120: ...Select a file transfer protocol by typing the indicated letter such as Z for Zmodem the recommended protocol 6 If you select Zmodem the transfer will begin automatically If you select another protocol...

Page 121: ...Hit ESC when finished 5 Highlight the Select File to Program option in the MAIN MENU Highlight the HEX file Hit ESC when finished 6 Highlight Program Firmware option in the MAIN MENU When you are pro...

Page 122: ...0989 Phone 800 826 0279 Fax 914 267 2420 Email info thesupplynet com Internet http www thesupplynet com SupplyNet Online Ordering Instructions 1 Browse to http www thesupplynet com In the Browse by Ma...

Page 123: ...Appendixes...

Page 124: ...d into a power strip make sure the power strip is plugged in and its power switch is on Make sure the power supply module is firmly connected to the modem and to the wall outlet or power strip If the...

Page 125: ...unications port Be sure to disable any unused ports To look for address or IRQ conflicts if you use Windows 3 1x select File Run in Program Manager type MSD and press ENTER Then select Mouse COM Ports...

Page 126: ...replace X4 with X3 which will cause the modem to ignore dial tones If the modem reports BUSY the other number may be busy in which case you should try again later or it may indicate that you have fai...

Page 127: ...inated on the other end of the line Try again If you were on line with a BBS it may have hung up on you because of lack of activity on your part or because you exceeded your time limit for the day Try...

Page 128: ...stop bits or parities If you have connected at 8 N 1 try changing to 7 E 1 or vice versa using your communications software You may be experiencing line noise Enable error correction if it is disabled...

Page 129: ...2 114 S DC3 13 19 3 33 51 S 53 83 s 73 115 T DC4 14 20 4 34 52 T 54 84 t 74 116 U NAK 15 21 5 35 53 U 55 85 u 75 117 V SYN 16 22 6 36 54 V 56 86 v 76 118 W ETB 17 23 7 37 55 W 57 87 w 77 119 X CAN 18...

Page 130: ...t 1 Each pulse consists of an A mSec open and a B mSec closed where A will be either 60 or 67 mSec and B will be either 40 or 33 mSec for a total of 100 mSec per pulse or a rate of 10 pulses per secon...

Page 131: ...200 to 28 800 to 24000 to 21 600 to 19 200 to 16 800 to 14 400 to 12 000 to 9600 to 4800 to 2400 to 1200 to 300 bps A1 selects initial handshake at 33 600 bps only A2 selects initial handshake at 33 6...

Page 132: ...connect Ds s phone Dial a telephone number s where s may include up to 60 digits or T P R comma and characters DsNd s phone Store telephone number To store phone d 0 thru 9 number s is entered and fol...

Page 133: ...ault setting E2 Break Method E3 Either or Break Method E4 No OK Response to E5 OK Response to Fn n 0 thru 2 F0 means no fallback when on line F1 means fallbackwhen on line increments of 2400 bps F2 me...

Page 134: ...nd LAP M off L2 means LAP M on and MNP off L3 means no detection phase but go directly to LAP M Mn n 0 thru 3 M0 means Monitor speaker always Off M1 means Monitor speaker On until carrier detected M2...

Page 135: ...al numbers following the P Pn n 0 or 1 P0 means 60 40 pulse ratio P1 means 67 33 pulse ratio Qn n 0 1 or 2 Q0 means Result Codes sent Q1 means Result Codes will be suppressed quiet Q2 means Dumb Answe...

Page 136: ...selects 19 200 bps at serial port SB38400 selects 38 400 bps at serial port SB57600 selects 57600 bps at serial port SFn n 0 or 1 SF0 selects DSR follows CD SF1 selects DSR independent Sn n 0 1 or 2 S...

Page 137: ...s single XOFF character sent until XON level returns X1 selects multiple XOFF characters after buffer level is full Yn n 0 or 1 Y0 disables sending or responding to long space break Y1 enables sending...

Page 138: ...ns are from 0 to 29 Must specify P pulse or T tone dialing in string Dxxxxxx Nxx Callback Phone Numbers xxxxxx with the preceding the phone number indicating the callback modem phone number for the co...

Page 139: ...in AT command mode without leaving AT command mode V5 DSR follows DTR in V 25bis mode V6 DSR does not follow DTR in V 25bis mode CSPs Changes the serial bps rate CSP0300 300 bps CSP1200 1200 bps CSP24...

Page 140: ...ne Down 0 dB Transmission leased line 4 UP UUCP Spoofing Off Down UUCP Spoofing On 5 UP Automatic Answer On Down Automatic Answer Off 6 UP Max throughput On Down Max throughput Off 7 UP RTS dependent...

Page 141: ...n AS 400 Mode On 5 UP Answer Mode On Down Originate Mode On 6 UP Slave Clocking Off Down Slave Clocking On 7 UP RTS Dependent on interface Down RTS forced on at all times 8 UP Command Mode Off Down Co...

Page 142: ...9600 bps Operation 1932 Series SWITCH CONDITION EFFECT 13 14 UP UP 19 2 K bps Operation 13 14 DOWN UP 14 4 K bps Operation 13 14 UP DOWN 9600 bps Operation 13 14 DOWN DOWN 2400 bps Operation 1432 Seri...

Page 143: ...a 4 255 4 character in a dial command 4 7 4 S9 100 mSec 1 255 6 Sets carrier detect response time S10 100 mSec 1 255 7 Sets delay time between when carrier is lost and when modem disconnects S11 1 mSe...

Page 144: ...cape sequence execution S34 ASCII 0 60 10 Buffer size for number of characters in AT command string after on line escape sequence before buffer is cleared and escape sequence aborted S36 1 second 0 25...

Page 145: ...bps and gone on line 11 CONNECT 4800 Modem has detected carrier at 4800 bps and gone on line 12 CONNECT 9600 Modem has detected carrier at 9600 bps and gone on line 13 CONNECT 14400 Modem has detected...

Page 146: ...able mode the following responses change 1L CONNECT LAPM 5L CONNECT 1200 LAPM 9L CONNECT 2400 LAPM 10L CONNECT 4800 LAPM 12L CONNECT 9600 LAPM 13L CONNECT 14400 LAPM 19L CONNECT 19200 LAPM 21L CONNECT...

Page 147: ...llowed and a CFIFF indication is given The modem in AT command mode will respond with NO CARRIER If country regulations require that the Forbidden Numbers list be checked in AT mode then NO CARRIER wi...

Page 148: ...nswers immediately upon receiving the first ring There is no disconnect message NO CARRIER if a normal connection is made V 25bis Set Up and Initialization Before you operate your modem in the V 25bis...

Page 149: ...Result Codes When in V 25bis mode the AT V1 command executed your modem provides you with several responses which can help you follow the progress of V 25bis operations These are similar to the Resul...

Page 150: ...command mode without leaving AT command mode the V 25bis command follows V2 on the command line Change Serial Baud Rate CSP Command The CSP command will change the serial baud rate of your modem by e...

Page 151: ...if the memory is full To list the numbers in the Forbidden list enter RLF and hit RETURN Disregard or Connect to Incoming Calls DIC or CIC Command The Disregard or Connect to Incoming Calls commands a...

Page 152: ...times out then no connection is possible 2 Switzerland a Command Indication modification 1 Modem must remain on hook for 5 seconds after disconnect 2 Modem must remain on hook for 5 minutes after 4 c...

Page 153: ...1 min delay between calls 2 After 4 retries the number is put on the forbidden list 3 The number remains on the forbidden list for 1 hour after entry to forbidden list 4 Delayed and Forbidden Numbers...

Page 154: ...20 DTR 22 RI TD 2 RD 3 RTS 4 CTS 5 DSR 6 GND 7 CD 8 DTR20 RI 22 Figure I 1 RS232 Cable IBM PC RJ 11 Type Modular Plug To Terminal Block Screws Transmit and Receive 1 2 3 4 5 6 RED Tip GREEN Ring Figu...

Page 155: ...x J RS 232C Interface Specifications 25 POS MALE DSUB 8 POS MINI DIN TD 2 RCV 3 RTS 4 CTS 5 GND 7 1 Handshake Out 2 Handshake In 4 GND 8 GND 3 TD 5 RCV 8 7 6 5 4 3 2 1 8 POS MINI DIN FEMALE Figure I 4...

Page 156: ...the EIA RS 232C standard itself The following chart lists the EIA RS 232C interface pins and circuits present on the modem s RS232C Interface connector All other pins are unused Pin Designation eia C...

Page 157: ...the modem that the computer or terminal has data that it wants to transmit Clear To Send Pin 5 CTS CB Direction from modem The CTS line indicates to the terminal that the modem will transmit any data...

Page 158: ...ates the center of each signal element on the Received Data circuit Data Terminal Ready Pin 20 TR or DTR CD Direction to modem This signal TR or DTR provides a means for the terminal or computer to co...

Page 159: ...to modem The Terminal Busy OOS circuit is not defined in the RS 232C standard but is used by us and most manufacturers to make the phone lines busy to incoming phone calls Pin 25 is not normally conn...

Page 160: ...y by British Communications Mercury Communication or Hull City Council Only direct exchange lines may be used not shared service b The modem is suitable for household office and similar general indoor...

Page 161: ...ebruary 1973 on the harmonization of the laws of Member States relating to electrical equipment designed for use within certain voltage limits and Council Directive 98 13 EC of 12 March 1998 on the ap...

Page 162: ...come non compliant New Zealand Telecom Warning Notice Use of pulse dialing when this equipment is connected to the same line as other equipment may give rise to bell tinkle or noise and may also cause...

Page 163: ...ou will be advised of your right to file a complaint with the FCC if you believe it is necessary 5 The telephone company may make changes in its facilities equipment operations or procedures that coul...

Page 164: ...f the power utility telephone lines and internal metallic water pipe system if present are connected together This precaution may be particularly important in rural areas Caution Users should not atte...

Page 165: ...llback Security Enable Disable DB 93 Callback Time Delay 81 95 Calling Card Detect Tones 52 Carrier Detect Control C 61 Carrier Detect Response Time 80 Carrier Detect DSR Forcing 114 Carrier Frequenci...

Page 166: ...30 Fax and Communications Software Won t Run 128 Fax Carrier Frequencies 14 Fax Modulations 13 Fax Back Service 121 File transfer protocols 32 Flash On Hook 51 FlashPro to Upgrade Modem Firmware 121 F...

Page 167: ...Speeds 84 Protocols 32 127 Pulse or Tone Dial P T 50 Q Quiet Answer 52 R Reading of Line Probe Information Commands 75 Receive Clock 158 Received Data 157 Receiver Sensitivity 15 Reliable Mode E2 63...

Page 168: ...31 16550 28 29 31 127 128 8250 28 31 8250A 28 29 31 Buffers 29 Identifying 28 Unix UUCP Spoofing 110 Unix UUCP Spoofing SP 55 Upgrading the MT2834BL 121 V V 25bis Mode AT Commands 149 V 25bis AT Comm...

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