Manual - U.S. Robotics
Contents
1. G1 Enables flow control between modems Types of Break to send to the modem MNP transfer mode LO MNP stream mode L1 gt MNP block mode Mode selection NO Selects normal speed buffer mode N1 Selects direct mode N2 Selects error correction mode Goes on hook in case of failure N3 Selects error correction mode Switches to buffer mode in of failure N4 Forces LAPM mode N5 Forces MNP mode RLSD DCD Option amp CO Forces the DCD signal to ON amp C1 True DCD according to the carrier detect signal DTR Option amp DO DTR signal override amp D1 Returns to command mode on falling edge of DTR amp D2 Returns to command mode and goes on hook on falling edge of DTR amp D3 Re initializes the modem and loads the configuration profile indicated by the amp Y command 20 Modem User s Manual amp Fn Load the factory settings amp FO Load factory configuration profile 0 amp F1 Load factory configuration profile 1 Modem User s Manual 21 amp Gn amp Jn amp Kn amp Pn amp Qn amp Rn amp Sn amp Vn amp Wn amp Yn Set the guard tone amp GO Turns the guard tone off amp G1 Turns the guard tone off amp G2 Sets the guard tone to 1800 Hz Telephone plug control amp JO Sets bit 1 of the S21 register to be amp J1 compatible with the Hayes command set Flow control amp KO Turns flow control off amp K3 Turns RTS CTS flow control on amp K4 Turns XON XOFF flow control on2. V 42 Protocol 0 Deactivates the V 42 handshaking and proceeds directly with the LAPM protocol 7 Enables V 42 handshaking 128 Disables handshaking and detection and takes into account the S36 register can be used to force an MNP connection Reserved Break management This register exists only for compatibility reasons Modifying this register will have no effect Result code on call failure reasons O Normal disconnect 4 Carrier loss 5 Handshaking failure during connection with the remote modem 9 Nocommon protocols 12 Normal disconnect initiated by the remote modem 13 No answer after 10 re transmissions of the same message 13 Protocol violation Reserved 30 Modem User s Manual Reg Default Function 95 44 Bit Value Result 0 1 CONNECT indicates the DCE speed 1 2 Adds ARQ to CONNECT in error control mode 2 4 Enables display of CARRIER xxxx 3 8 Enables display of PROTOCOL XXXX 4 16 Reserved 5 32 Enables display of COMPRESSION xxxx 6 64 Reserved 7 128 Reserved 99 Reserved 202 Reserved AutoSync Modems are traditionally divided into two categories e asynchronous modems that communicate with the PC via an asynchronous coupler called UART e synchronous modems interfaced with an asynchronous coupler SCC USART etc The function of the couplers mentioned above is to transform on a computer the parallel data on 8 wires byte by byte into a flow of serial data c
3. where r is the number of the S register and n is a decimal value between 0 and 255 unless otherwise stated Use ATSr To examine the configuration of a register For example ATSO Enter Reg So S1 S2 S3 S4 S5 Default 2 43 Function Sets the number of rings on which to answer in Auto Answer Mode When set to 0 Auto Answer is disabled Accepted values are 0 or 2 Counts and stores the number of rings from an incoming call The range of acceptable values is from 0 to 255 Stores the ASCII decimal code for the escape code character The default character is A value between 128 and 255 disables the escape code The range of acceptable values is from 0 to 255 Stores the ASCII decimal code for the carriage return character The range of acceptable values is from 0 to 127 Stores the ASCII decimal code for the new line character The range of acceptable values is from 0 to 127 Stores the ASCII decimal code for the back space character The range of acceptable values is from to 32 Modem User s Manual 23 Reg Default S6 8 S7 55 S8 2 option S9 6 recognition S10 14 during loss the other momentarily remote S11 95 from S12 50 S13 Function Sets the number of seconds the modem waits before dialing If it is set to X2 or X4 the modem ignores this register and dials as soon as it detects a dial tone fast dials The range of acceptable values is from 6 to 12 Se
4. 1 2 3 1 4 6 7 7 General Bit Val 0 0 1 3 3 4 5 3 6 7 0 Result Equivalent to L1 0 Low 2 Medium 3 High Equivalent to M1 0 Off 2 always active 3 Active during handshaking period Equivalent to X4 0 X0 4 X1 5 X2 6 X3 Reserved Result RDL not allowed DTE speed set to 2400 bps Default DTE parity Equivalent to amp GO Sets in seconds the duration of operation of the modem in normal mode with no activity on the line before going into sleep mode The timer is re initialized as soon as there is any activity on the line If S24 is set to 0 the sleep mode is disabled 26 Modem User s Manual Reg 25 S26 S27 S28 2 amp P2 S29 S30 S31 S32 S33 Default 5 Function Sets in hundredths of second the duration in which the DTR signal must be off for the modem not to interpret a random problem as a loss of the DTR signal Most users will use the default value this register is useful to insure compatibility with older models that use older operating software Reserved Select asynchronous synchronous mode Bit Val Result 0 1 3 5 Equivalent to amp Q5 0 amp Q0 1 amp Q1 2 amp Q2 3 amp Q3 4 amp Q4 6 amp Q6 2 0 Reserved 45 0 Reserved 6 0 Equivalent to BO 1 B1 7 Reserved Bit Val Result 0 2 Reserved 3 4 0 Equivalent to amp PO 1 amp P1 3 amp P3 5 Reserved 6 7 0 Equivalent to HO 1 H1 2 H2 Duration of the inactive period after
5. a flash Sets the duration in tenths of a second before the modem hangs up after a Flash From 0 to 255 in 10 ms intervals Sets the duration in tenths of a second for the timer to be inactive The timer is activated when there is no activity on the telephone line At the end of this period the modem goes on hook hangs up If S30 0 the timer is disabled Reserved Stores the decimal ASCII code of the XON character Stores the decimal ASCII code of the XON character Modem User s Manual 27 Reg 34 35 S36 S37 Default Function Reserved Reserved LAPM mode error control Answer failure in LAPM The value indicates what will happen in case of failure Bit Value Result 0 2 7 0 On hook 1 Stays on line and toggles to direct mode 2 Reserved 3 Stays on line and toggles to standard mode 4 Attempt to make an MNP connection go on hook in case of failure 5 Attempt to make an MNP connection in case of failure toggles to direct mode 6 Reserved 7 Attempt to make an MNP connection in case of failure toggles to normal mode 3 7 Reserved Connection line speed Identical to the F or MS commands 0 Attempt to connect at the maximum speed FO 1 3 Attempt to connect at 300 bps MS 0 or F1 4 Reserved 5 Attempt to connect at 1200 bps MS 1 or F4 6 Attempt to connect at 2400 bps MS 2 or F5 7 Attempt to connect in V 23 MS 3 or F3 8 Attempt to connect at 4800 bps MS 9 1 480
6. bad select a lower transmission speed Re initialize the modem to the factory settings Change the transfer protocol Check the modem s and the software s flow control Remove all terminate and stay resident programs TSRs that could be active during the connection If the problem occurs during the transmission of a fax from Windows or OS 2 check that the communications driver that you are using is the one corresponding to the environment that you use Windows OS 2 or the one supplied specifically with the communications software If you are still having problems e Re read this manual especially the Utilization notes Contact your reseller who will be able to provide you with the necessary assistance This is much more efficient and less costly than sending the modem back to us for a problem that is possibly only a simple matter of adjusting the settings Modem User s Manual 13 14 Modem User s Manual Appendix A Technical Reference Main AT commands 1 Type the commands entirely in upper case or lower case but do not type commands using a combination of the two cases All commands with the exception of A and are preceded by the AT prefix and are executed after pressing the Enter Carriage Return key lt Enter gt The maximum length of a command is 40 characters The modem does not count the AT prefix character the Enter key or spaces On the other hand it does count punct
7. default register Sn v Sets register n to v Sn Returns the value contained in register n Forces tone dialing DTMF Result code format VO Abbreviated format V1 Long format Connection control message WO Returns the DTE speed W1 Returns the line speed data correction protocol and DTE speed W2 Returns DCE speed 18 Modem User s Manual Xn Extended result codes XO Displays the basic status messages of the call ex OK CONNECT RING NO CARRIER NO ANSWER and ERROR X1 Displays the basic status messages of the call and connection speeds OK CONNECT RING NO CARRIER NO ANSWER CONNECT XXXX and ERROR X2 Displays the basic status messages of the call and connection speeds OK CONNECT RING NO CARRIER NO ANSWER CONNECT XXXX and ERROR X3 Displays the basic status messages of the call and transmission rates OK CONNECT RING NO CARRIER NO ANSWER CONNECT XXXX and ERROR X4 Displays all status messages of the call and connection speeds Yn On hook upon reception of a long break YO _ Deactivates on hook upon reception of a long break Y1 Activates on hook upon reception of a long break Zn Software re initialization and reset of the configuration ZO Re initialization and reset of settings stored in profile O Zi Re initialization and reset of settings stored in profile 1 MS lt mod gt lt automod gt lt mini gt lt maxi gt Selection of modulation speed lt mod gt specifies modulation 0 1 2 3 9 1
8. 0 11 64 69 74 lt automod gt Negotiation of forced or automatic modulation O or 1 lt mini gt specifies the minimum speed that the modem will connect at according to the modulations given below lt maxi gt specifies the maximum speed at which the modem will connect at Example AT MS 11 1 14 400 28 800 MS Returns the modem s current settings MS Returns the list of values accepted by the modem MS 0 V 21 indication MS 1 V 22 status 1200 bps speed MS 2 V 22 bis status 1200 or 2400 bps speed MS 3 V 23 status E R at 75 1200 Answer E R at 1200 75 Always specify the speed at 1200 bps MS 9 V 32 status 9600 bps or 4800 bps MS 10 V 32 bis status 14 400 12 000 9600 7200 or 4800 bps MS 11 V34 status 28 800 26 400 24 000 21 600 19 200 16 800 14 400 12 000 9600 7200 4800 or 2400 bps MS 64 Bell status 103 at 300 bps Modem User s Manual 19 MS 69 Bell status 212 at 1200 MS 74 V FC status at 28 800 26 400 24 000 21 600 19 200 16 800 or 14 400 bps EXTENDED COMMAND SET An Bn Gn Kn Ln Nn case amp Cn amp Dn MNP Block size AO Configures MNP maximum block size to 64 A1 Configures MNP maximum block size to 128 A2 Configures MNP maximum block size to 192 A3 Configures MNP maximum block size to 256 Transmits break signals n times 100 ms from 1 to 9 Enables disables the modem to modem flow control XON XOFF GO Disables flow control between modems
9. 0 or F6 9 Attempt to connect at 9600 bps MS 9 1 9600 or F8 10 Attempt to connect at 12 000 bps MS 10 1 12000 or F9 28 Modem User s Manual Reg 38 39 S40 S41 Default 20 105 131 Function 11 Attempt to connect at 14 400 bps MS 10 1 14 400 or F10 12 Attempt to connect at 7200 bps MS 11 1 7200 or F7 Sets in seconds an optional delay before forcing disconnection and erasing the transmission buffer when the DTR signal is removed during a call with error control This allows a remote modem to acknowledge reception of all data before being disconnected The default value is set to 0 the modem goes on hook immediately when the DTR signal falls Flow control Bit Value Result 0 2 3 RTS CTS Equivalent to amp K3 0 No checking 4 amp K4 5 amp K5 6 amp K6 3 7 Reserved Extended MNP functions 0 1 0 Disables the extended functions Equivalent to KO 1 K1 2 K2 2 0 Level setting 3 5 5 Equivalent to K5 0 K0 1 K1 2 K2 3 K3 4 K4 6 7 1 MNP block size Equivalent to A1 0 A0 2 A2 3 A3 0 1 3 Equivalent to C3 0 CO 1 C1 2 C2 2and6 Equivalent to EO 2 E1 64 E2 3 Reserved 4 0 Equivalent to LO 1 L1 5 Reserved 7 1 Equivalent to Q1 0 Q0 Modem User s Manual 29 Reg S46 S48 80 82 S86 91 S92 Default 138 Function Data compression 136 Error control without compression 138 Error control with compression
10. ER Connection problem with a 2400 bps modem High speed data transmission V 32 bis V 34 failed The speaker is turned off reset the modem s settings to the factory settings The cables are not correctly connected Check all connections from the telephone wall jack to the modem There is a problem with the telephone line check it using a standard telephone set You are connected to an incompatible telephone network Refer to the section Utilization Notes in this manual Check that the application s auto answer mode is turned on Some office networks use a low voltage call signal that the modem cannot recognize Try connecting the modem to a line that is not part of this type of network Incorrect software configuration Check that the transmission speed the parity and the number of stop bits defined in the software correspond to the settings of the remote modem Data compression could be used on one of the modems and not on the other Check the flow control If required reconfigure the modem to the factory settings Someone probably hung up from another extension The modem detected a call waiting signal on the line Contact the local telecommunications agency to find out how to turn this signal off when you use the modem Try calling another modem to check if the problem is general or unique to one specific modem The telephone line is of low quality try communicating at a lower speed Some older
11. U S Robotics and the U S Robotics logo are U S Robotics registered trademarks V Fast Class V FC is a Rockwell international registered trademark Minitel and T l tel are France Telecom registered trademarks IBM IBM PC PC XT and PC AT are International Business Machines Corporation trademarks Microcom Networking Protocol MNP is a Microcom Inc registered trademark AutoSync is a Hayes registered trademark Table of Contents CHAPTER 1 INSTALLATION 5 WorldPort PCMCIA V 34 CE Installation 5 CHAPTER 2 USING THE MODEM 7 Installation Test 7 Factory Settings 8 Resetting the modem to the factory settings 8 Remarks on using the modem 9 CHAPTER 3 IN CASE OF PROBLEMS 11 Problems and Solutions 11 If you are still having problems 13 APPENDIX A TECHNICAL REFERENCE 15 Main AT commands 15 Basic command set 15 Extended command set 20 S Registers 23 AutoSync 31 APPENDIX B TECHNICAL SPECIFICATIONS 33 WorldPort PCMCIA V 34 CE Specifications 33 Electrical Power 34 Electro magnetic Compatibility 34 GLOSSARY 33 Chapter 1 Installation WorldPort PCMCIA V 34 CE Installation Turn the computer and any connected peripheral devices off 1 Locate the PCMCIA 2 0 compatible slot on the computer Insert the modem in its slot with the side on which the product name is shown facing up NOTE an arrow on the top side of the card shows the proper direction to use for insertion 2 The modem must be inserted deeply into the slot in ord
12. amp K5 Transparent flow control XON XOFF DTE DCE amp K6 Turns RTS CTS and XON XOFF flow controls on Select pulse rotary dial make break ratio amp PO 10 ips with 39 61 ratio amp P1 10 ips with 33 67 ratio amp P2 20 ips with 39 61 ratio amp P3 20 ips with 33 67 ratio Synchronous Asynchronous modes amp Q0 Select direct asynchronous mode amp Q4 Select AutoSync mode amp Q5 The modem negotiates a connection with error control amp Q6 Select asynchronous operation in normal mode RTS CTS option amp RO CTS follows RTS amp R1 CTS is always active DSR management amp S0 DSR is always active amp S1 True DSR Displays the current configuration amp V Displays the current configuration profile Store the current configuration amp WO Store the current profile in NVRAM as profile 0 amp W1 Store the current profile in NVRAM as profile 1 Specifies the default re initialization configuration profile amp YO Upon power up the configuration is set to profile 0 amp Y1 Upon power up the configuration is set to profile 0 22 Modem User s Manual amp Zn x Stores the dial string x 35 char in position n 0 to 4 Cn Turns data compression on off C0 Turns data compression off C1 Sets data compression to MNP 5 C2 Sets data compression to V 42 bis C3 Sets data compression to both V 42 bis and MNP 5 S Registers Default values are appropriate for most users The settings are modified with the ATSr n command
13. ax modem can transmit and receive facsimiles Terminal mode Required simulation mode for computers to transmit data In terminal mode the computer acts as though it were a dumb terminal rather than a data processing unit Keystrokes go directly to the modem whether they are modem commands or data to be transmitted via the telephone lines Received data are displayed directly on the screen Modem User s Manual 37 Parity Error detection method that checks the correctness of transmitted characters Verification of characters has been replaced by more reliable and efficient block control methods including Xmodem types of protocols and the ARQ protocol implemented in the modem Two communicating computers must use the same kind of parity Carrier Continuous frequency that can be modulated or act as a support to another data carrier signal Carrier waves are generated and maintained by modems via the telephone companies transmission lines Protocol Set of rules and procedures describing communications between different devices Protocols vary but communications equipment must use the same protocol in order to exchange data Data formats the ready to receive or transmit states error detection and correction are some of the operations that can be defined in protocols Fallback Rate adjustment A function that lets rapid modems with error correction control the line quality and fall back to a lower speed if it becomes degraded Modem
14. cial characters such as and Bit AO ora 1 reflecting the use of a binary numbering system a system that consists of 2 values This system is used because the computer only recognizes two states off or on Start Stop bits Signaling bits attached to a character before it is transmitted used for asynchronous transmissions Bps The rate in bits per second Thousands of bits per second are expressed as kilobits Cps Data transfer rate Characters per second It is generally estimated from the binary rate and the length of characters For example at 2400 bits s 8 bit characters with a start and stop bit for a total of 10 bits per character are transmitted at an approximate rate of 240 characters per second cps Some protocols such as the error correction protocols in the modem use advanced techniques requiring longer transmission frames and data compression to increase the number of characters per second Flow control A method that compensates for differences in the data flow coming in to and going out from a modem or other device See RTS CTS and XON XOFF Error correction Various techniques that check the reliability of the characters or data blocks The V 42 and MNP2 2 10 error correction protocols use error detection using a CRC type control code and re transmit erroneous frames ARQ Modem User s Manual 35 DCE Data Carrier Equipment Termination equipment of the data circuit In this manual this term app
15. e busy tone Store configuration Non volatile memory storing two modem configurations and four telephone numbers Transmission level Country specific Reception sensitivity Country specific Size 54x 85 6 x 5 mm Operating temperature from 0 to 50 C Modem User s Manual 33 Storage temperature from 40 to 70 C Transportation temperature from 40 to 70 C Operating humidity from 20 to 80 without condensation Storage humidity from 5 to 90 without condensation Operating altitude 3000 meters Electrical Power Before making connections check the safety levels on the various interfaces Telephone line connector TRT PCMCIA 2 0 connector TBTS These indications are classified as per security standard EN 60 950 A2 dated October 1993 TBTS Very Low Safety Voltage TRT Telecommunications Network Voltage voltages in compliance with standard NF EN 41 003 dated July 1993 criteria Electro magnetic Compatibility This device complies with the following standards in accordance with the European Directives 91 263 CEE and 89 336 CEE Immunity EN50082 1 class B Transmission EN 55022 34 Modem User s Manual Glossary ARQ General term qualifying error correction protocols that detect errors and automatically re transmit the incorrect data blocks See MNP and V 42 ASCII Acronym for American Standard Code for Information Interchange 7 bit binary code 0 and 1 used to represent letters numbers and spe
16. ect the bits that should be set to one and set S14 to the decimal total of the found binary value For example if you want to set bits 7 value 128 and 5 value 32 the S14 register should be set to 160 decimal In the same way ATS14 17 set bit O value 1 and bit 4 value 16 1 Echo command Er 0 E0 1 E1 2 Quiet mode Qr 0 Q0 1 Q1 3 Result codes Vr 0 VO 1 V1 4 Reserved 5 Tone T Pulse P 0 T 1 P 6 Reserved 7 Send Answer 0 Answer 1 Send Reserved Bit mapped register see the instructions for register 14 Bit Val Result 0 Reserved 1 2 Dialing test 2 4 Specifications test 3 8 Remote digital loopback 4 6 Reserved Reserved Sets the duration of attempts in seconds before the modem returns to command mode If the value is set to 0 the test will not terminate automatically It will have to be stopped using the amp TO or H command AutoSync AutoSync Modem User s Manual 25 Reg Default S21 4 2 amp D2 S22 117 S23 54 S24 0 Result Depends on the amp J0 1 amp J1 command Reserved Equivalent to amp R1 CTS always on 0 amp R0 CTS follows RTS Equivalent to amp DO 1 amp D1 3 amp D3 Equivalent to amp C0 for what concerns the DCD 1 amp c1 Equivalent to amp SO for what concerns the DSR 1 amp S1 Equivalent to YO 1 Y1 Speaker and results code Function V 24 Bit Val 0 0 1 2 1 3 4 0 5 0 6 0 7 0 Bit Val 0 1
17. er to connect it to the pins located at the back of the casing Insertion of the WorldPort modem in the PCMCIA slot 3 Connect the DAA connector telephone line interface to the modem Modem User s Manual 5 Connecting the DAA cable to the WorldPort modem 4 Plug the telephone connector to the wall jack The modem is now ready to be tested and used NOTE To remove the modem from its slot see the computer documentation Most computers have a button next to the slot to eject the modem in the same way as when you remove a diskette from its drive 6 Modem User s Manual Chapter 2 Using the MODEM Installation Test Follow this procedure to check that the modem works correctly 1 5 wit 6 Turn the computer on NOTE Computers with PCMCIA ports have a program that initializes the PCMCIA port as a serial port when a modem is inserted in it Check the computer documentation for further information Load and run the communications software Check the software installation manual for further information Inthe software set the serial port rate to 38 400 bits per second bps for a V 34 model in some software this is referred to as the baud rate The modem will automatically detect this setting when you send a command to it Specify the serial communications port used by the modem COM1 COM2 or other Set the data format to an 8 bit length with no parity or to a 7 bit length h eve
18. f the modem used to display keyboard command and transmitted data on the screen This function is provided with most communications software 36 Modem User s Manual IRQ Interrupt Request In a computer IRQs are used to temporarily interrupt current processing when an event requires immediate attention such as for example the arrival of data at the serial port LAPM Link Access Procedure for Modems Error correction protocol incorporated in the ITU T V 42 recommendation Just like the MNP protocols LAPM uses cyclical redundancy check CRC and automatic re transmission of data ARQ to guarantee data reliability NVRAM Non Volatile Random Access Memory which can be programmed by the user with data that are stored when the modem is powered down The modem includes this kind of memory to store a default configuration defined by the user and loaded into random access memory RAM upon power up MNP Microcom Networking Protocol Error correction protocol developed by Microcom Inc and now in the public domain MNP protocol guarantees error free transmissions using error detection CRC and re transmission of incorrect data frames The modem uses MNP 2 4 and MNP 5 error correction and data compression techniques that are incorporated in recommendation ITU T V 42 Data mode Mode in which the fax modem can send and receive data files A standard modem without facsimile capabilities is always in data mode Fax mode Mode in which the f
19. in terminal mode you send AT commands Check the software configuration Make sure that it is configured for the appropriate COM port in most cases it should be set to COM2 Check also that no other application is using this same port Check also that the modem is properly inserted in its casing Both the modem and the application local echoes are turned on To turn local echo off type ATEO lt Enter gt Check the connection to the telephone line It could be that the modem cannot detect the dial tone Insert a comma at the start of the dial sequence Check that the COMmunications port to which the modem is connected is properly declared Check the IRQ configuration in the communications software or in the Windows Control Panel Check that the application is in terminal mode If none of the preceding solutions solve the problem it means that the modem is certainly in conflict at the COM port IRQ level Begin the installation procedure in the Installation chapter Don t forget if you change the COM IRQ configuration to also make these changes in the application Modem User s Manual 11 There is no audible tone when you try to call The modem does not respond to incoming calls The modem connects to the remote modem but the text received is illegible The modem connects itself correctly to the remote modem but the connection is interrupted during communications with the message NO CARRI
20. lies to modems that establish and control the data link on the telephone network Transmission rate Number of bits transmitted per second bit s Communications channels using modems on telephone lines are set to binary rates generally 2400 9600 14 400 or 28 800 Baud rate Number of state transitions per second on a communications channel Even though it is incorrect from a strict technical point of view the baud rate is often used to indicate the transmission rate DTE Data Terminal Equipment Data processing terminal equipment Generally a computer or terminal generates data or is the final destination of data Duplex Defines a communications channel capable of transmitting signals in both directions half duplex or full duplex Full duplex Simultaneous flow of signals in two directions In micro computer communications full duplex can refer to suppressing the local echo of transmitted characters Half Duplex Signal flow in two directions but only in one at a given time In micro computer communications half duplex can refer to enabling of the local echo that causes the modem or the software to send a copy of transmitted data to the screen of the transmitting computer Remote Echo A copy of the data received by the remote system is sent back to the transmitting system and displayed on the screen Remote echo is a function of the remote system and is often used in full duplex transmissions Local Echo A function o
21. modem models will not connect when the error correction protocol is on Turn this protocol off with the following command AT NO lt Enter gt Check if there are any time share applications or programs working in parallel to the communications application The quality of the telephone line is too low to withstand high speed data transfer decrease the modem s transmission speed 12 Modem User s Manual International connections cannot be made Calls to foreign countries terminate with a NO CARRIER message Intercontinental connections are sometimes interrupted During file transfer the modem sends back many transmission errors or a very low transfer rate During transmission of a fax errors alter its legibility or cut off the connection Because of the length of the number dialed and the differences in telephone networks it may be the case that some digits do not get interpreted during the dialing process Insert commas between parts of the dialing number in order to create pauses For example if you are calling 0044628668476 insert commas and dial 00 44 628 668476 instead Increase the amount of time to wait for a carrier signal In terminal mode type ATS7 60 and press the Enter key The wait period is then set to 60 seconds If the telephone line s quality is low it is best to reduce the transmission speed in order to insure that the connection remains stable The telephone line is
22. n or odd parity either one will do and 1 stop bit Execute the function that authorizes sending AT commands to the modem in other words put the computer in terminal mode Verify that the computer and the modem can communicate with each other by sending the following ATtention command you can type the command either with uppercase or lowercase letters but you must not combine the two different types of letters Press the Enter key carriage return indicated in the following example by the word Enter surrounded by brackets AT lt Enter gt If everything is OK the modem will respond with the following message OK NOTE If the command is not echoed back AT is not displayed on the screen it means that local echo is turned off In order to turn it on send the following command to the modem Modem User s Manual 7 ATE1 lt Enter gt If on the contrary the screen displays double characters it means that local echo is turned on both at the modem and in the software Turn the software local echo off if such an option is available or turn the modem local echo off with the following command ATEO lt Enter gt Factory Settings The modem has been pre configured at the factory In most cases it will work properly with these factory settings But if necessary you can modify them with the communication commands In order to display the present modem settings do the following Run the communications program G
23. o into the program s terminal mode Type AT amp V lt Enter gt The modem will respond to this command by displaying a list of the configuration settings To modify them please refer to Appendix A Resetting the modem to the factory settings Some transmission sessions can modify the modem s configurations If you are unsure of the current configuration of the modem or if it seems to be not working correctly you might want to reset it to the factory settings To do this Run the communications program Go into the program s terminal mode Type AT amp F lt Enter gt This re initialization includes resetting the hardware data control setting a fixed speed on the communication port and complete result codes On the other hand some communications programs let you choose the modem in a menu list If you can t find your modem there you can enter this initialization string in the settings screen of the application 8 Modem User s Manual Remarks on using the modem Remember the following points when you use the modem The modem might not work with all modular telephone sets Specifically you must not use the modem with multi line telephone sets sets with indicator lights or line selection buttons Some voice mail message systems use a specific tone to indicate that a voice message has been received The modem will not be able to dial as long as this signal is on the line Listen to the waiting messages in order to get the no
24. omposed of bits following each other on one wire According to whether the coupler is synchronous or asynchronous the parallel to serial conversion is performed in a different manner For this reason a synchronous modem cannot interpret the data coming from a remote asynchronous modem The function of AutoSync is to allow an asynchronous modem to dialog with a synchronous modem by reconverting the asynchronous synchronous data coming from a PC AutoSync provides synchronous transmissions via the asynchronous port of the modem Synchronous transmissions can be in bit mode HDLC SDLC or in character mode VIP etc Modem User s Manual 31 32 Modem User s Manual Appendix B Technical specifications WorldPort PCMCIA V 34 CE Specifications Compatibility Data ITU T V 34 V FC V 32 bis V 32 V 23 V 22 bis V 22 V 21 and Bell 212A 103 Fax Transmission reception Group Ill Fax Class 1 Class 2 ITU T V 17 V 29 V 27 ter Speeds Data 28 8K 26 4K 24K 21 6K 19 2K 16 8K 14 4K 12K 9600 7200 4800 2400 1200 1200 75 75 1200 300 bps Fax 14 4K 12K 9600 7200 4800 2400 bps Error correction ITU T V 42 MNP 2 4 Serial port speed 115 200 bps maximum Operation Full Half duplex Format DTE DCE Serial binary asynchronous synchronous AutoSync Hayes protocol for synchronous transmissions Command set Compatible with the AT command set Fax mode EIA 578 Class 1 TR 29 Class 2 Call status Dial ton
25. orrection software protocols used to transfer files between modems These protocols are in the public domain and are available on many servers Ymodem and Zmodem are later protocols XON XOFF Standard ASCII control characters used to tell an intelligent device to stop or resume data transmission In most systems typing lt Ctrl gt S sends the XOFF character which tells the remote device to stop transmitting Some equipment including your modem interpret lt Ctrl gt Q as XON which tells the remote device to resume transmission others interpret touching any key after lt Cirl gt S as an XON Modem User s Manual 39
26. rmal dial tone back so that the modem can dial The modem has an automatic speed reduction function This means that it automatically reduces its data transmission speed in order to match the speed of the remote modem This also means that it may take the modem up to 30 seconds to establish communications with a slower modem Acomma in the dialed number causes a pause during dialing You can insert multiple commas in the command line in order to obtain a longer pause The modem must detect a carrier within a specific time interval otherwise it will display the message NO CARRIER or NO ANSWER You can increase this interval in seconds by going into the terminal mode of the communications application and typing in AT S7 value Note This va ue must be between 1 and 255 seconds refer to the AT command table for further details Modem User s Manual 9 10 Modem User s Manual Chapter 3 In case of problems Problems and Solutions If you encounter problems even though you have followed the installation and use instructions of the modem refer to the following table that lists the most common failures and their solutions Identifying the current problem Seton Ten The software indicates that the modem is not installed The modem displays double characters on the terminal screen The modem cannot make a call and sends the message NO DIAL TONE The modem does not respond when
27. s go back to a higher speed if the line quality improves RTS CTS Hardware check used to tell an intelligent device to stop or resume data transmission Analog signals Variable and continuous waves such as voice tones carried by telephone lines Compare with digital signals Digital signals Discrete and uniform signals In this manual the term refers to bits 0 and 1 Buffer An area of memory used as temporary storage during input output operations The modem has for example a command buffer 38 Modem User s Manual Terminal A unit whose keyboard and screen are used to send and receive data via a communications link A terminal differs from a micro computer in that it has very little or no internal processing capabilities Asynchronous transmission Data transmission during which the time between transmission of characters can vary Since the time delays between characters are not uniform the receiving modem must be signaled when the start and end of a characters data bits occur Stop and start bits are therefore added to each character transmitted Serial transmission Sequential data transfer one bit at a time using only one electrical circuit Synchronous transmission Data transmission during which both communicating devices are synchronized by a common clock Using this mode eliminates the need to systematically add a stop bit and a start bit to each transmitted character Xmodem The first of a family of error c
28. ts the number of seconds the modem waits for a carrier May be set for a much longer duration if for example the modem is making an international connection The range of acceptable values is from 36 to 58 Sets the duration in seconds for the pause in the Dial command The range of acceptable values is from 0 to 255 Sets the required duration in tenths of a second of the remote modem s carrier signal before by the modem The range of acceptable values is from 0 to 255 Sets the required delay in tenths of a second which the modem waits before hanging up after of the carrier signal This guard delay is used by modem to differentiate between interference or disturbance that interrupts a connection and the disconnection going on hook of the modem This waiting interval is set to the value of S10 minus the value of S9 In any event S10 must be greater than S9 or the modem will disconnect before recognizing the carrier signal NOTE If you set S10 255 the modem will not hang up if the carrier signal is lost Removal of the DTR signal will force the modem to hang up Sets the duration and spacing in milliseconds for tone dialing The range of acceptable values is 0 to 255 Sets the duration in fiftieths of a second of the guard time for the escape code sequence Reserved 24 Modem User s Manual Reg 14 S15 S16 S17 S18 S19 S20 Default 170 Function Bit mapped register Sel
29. uation marks such as dashes and parentheses Any missing numeric parameter is considered to be equal to zero for instance the disconnect command ATH lt Enter gt is equivalent to ATHO lt Enter gt BASIC COMMAND SET Command Function AT ATtention informs the modem that a command is being given to it This prefix must precede all commands except for A and Refer to the extended command set summary that follows this basic command set section Forces the answer auto answer mode The modem answers in answer mode when it detects a ring on the telephone line and it sends an answer tone If it does not detect a carrier signal from a calling modem within 60 seconds it goes off hook and the manual answer mode is canceled Pressing any key after the modem answers cancels manual answer and causes the modem to go on hook Re executes the last command once A does not require the AT prefix nor the Enter key Modem User s Manual 15 Bn Dn En Fn Hn 16 CCITT or BELL BO V 22 status 1200 bps connection or V 21 connection at 300 bps B1 Bell 212A status connection at 1200 bps or Bell 103 connection at 300 bps Dialing DL Re dial the last number DP Pulse rotary dial DT Tone dial DTMF DS n Dial the stored number Flash Rapid on hook W _ Wait for tone before dialing Wat for a quiet answer j Pause during dialing Return to command mode Command Echo EO Turns echo off E1 T
30. urns echo on Selecting modulation speed FO Auto detect mode equivalent to N1 F1 V 21 or Bell 103 indication F2 Reserved F3 V 23 indication F4 V 22 or Bell 212A status 1200 bps speed F5 V 22 bis status 2400 bps speed F6 32 bis or V 32 status 4800 bps F7 32 bis status 7200 bps F8 V 32 bis or V 32 status 9600 bps F9 V 32 bis status 12 000 bps F10 V 32 bis status 14 400 bps Disconnect on off hook HO On hook H1 If already on hook goes off hook and into command mode Identification codes 10 Product code 1 ROM checksum 12 Checksum and status 13 Firmware version number 14 Specific information 15 Returns the country code Modem User s Manual l6 Returns the Data pump model Modem User s Manual 17 Ln Nn Sn Vn Speaker level control LO Low volume L1 Low volume L2 Medium volume L3 High volume Speaker control MO Turns the speaker off Mi Speaker active until connection M2 Speaker always active during dialing and connection M3 Speaker inactive during dialing but active during connection Automode control NO Turns automatic speed detection off N1 Turns automatic speed detection on Return on line from command mode O0 Return to data transmission mode O1 Return to data transmission mode with resync request Forces pulse dialing Control codes display QO Displays DTE code results Q1 Inhibits DTE code results Read Write to the S register Sn Selects the n register as the
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