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1. 33 Transmit Carrier Control C nennen 33 Dial in Originate Mode D eeneneenennen 33 Command Character Echo E ee 33 Hook Eontr l H 1 242222 2er ae 34 Identifie tions M u 4 22 4er 34 Speaker Volume Control L ueenee 34 Speaker On Off Control M ennnnsnnnen 35 Swap Dialing N inii n eiii ii 35 Set Redial Times N n nneseenn 36 Set Redial Interval N5 n nenne 36 Read Redial Times N nee 36 Read Redial Interval N5 ee 36 On Eine OJ asdsesikekiieiiigenailaeklsisksihe 36 PulseDialin P 2a Ra 37 Response Codes Control Q esensseneneen 37 Reverse Dialing R sisi secede 288 37 Dial the Stored Number S n ee 38 Read Register St pnn 38 Set Resister St N wc savers 4 4 een 38 Touch Tone Dialing T esessne 39 Word or Digital Response Codes V sene 39 Response Set Selection Xn eesnsen 39 Long Space Disconnect Y 2224222202200 Berner sneen 40 Reset IA ores es Acerca eines 40 Auto dial at Power On amp An 40 CD Option amp E a een 41 DTR Option KD a2 elle ee 41 Load Factory Default Settings amp F
2. ssssscsssssssssscsssccssscsssssssseccsssees 74 Command Codes 77 Command Code 78 Installing PC 104 Modules 83 Installing PC 104 modules e seseseoesecsocesooesoossoesosessosesesssee 84 Unpacking and Installation CHAPTER INTRODUCTION Congratulations on your modem purchase You have acquired a powerful tool that lets you use a telephone line or leased line to link your computer to others at home or in the office As a result you have enhanced the power of your computer and can now exchange infor mation with databases bulletin boards and other computer users around the world The PCM 3600 faxmodem supports the international data communi cation protocols of CCITT V 34 recommendation at 28 800 bps as well as the CCITT V 21 V 22 V 22bis V 23 V 32 V FC V 34 recommendations and the Bell 103 212A standards With the V 23 protocol support you may use your PCM 3600 to communicate with Videotex services such as BTX and Minitel Your PCM 3600 provides all basic intelligent features such as auto dial auto answer auto speed adjust and call progress monitoring In addition it is equipped with non volatile memory so that you may store frequent use telephone numbers and configuration profiles to gain more accessibility and productivity By supporting the international error correction and data compression standards of CCITT V 42bis V 42 and MNP Class 2 to 5 your PCM 3600 d
3. e 42 Guard Tone Selection amp G 0222200 essen 42 Leased or Dial Up Line Selection amp L 42 Asynchronous or Synchronous Mode Selection amp M 43 Pulse Dial Selection amp P 43 Asynchronous or Synchronous Selection amp Q 44 CTS to RTS Option amp R neeseessenssnnennenn 44 Data Set Ready DSR Option amp S eeen 44 Diagnostics Tests amp T eirinen ai 44 Read Configuration Profiles amp V ee 45 Write Configuration Profile amp W eeee 45 Select Store Profile amp Y seeseeenen 46 Store Telephone Number amp Zn2 essnnen 46 Wait for Silent Answer nn 46 Pause COMMA inners netoaren a 47 Dial the Stored Number n nennen 47 Escape Characters ccccccccccsssccssscecsseeeseccesenecneaesneeeeenes 48 Flash exclamation eraran r ei N 48 Return to Command State semicolon 48 Ring Control B ucsssnnssssnsenensensnnensnnnnnn 49 5 ECDC and Extended Commands 51 ECDC and EXTENDED COMMANDS ccsccssssssssereeees 52 Maximum ECDC Block Size A e 52 Transmit Break B nennen 52 Auto Reliable Buffe
4. PCM 3600 PC 104 Fax Modem Module Copyright Notice This document is copyrighted 1996 by AAEON Technology Inc All rights are reserved AAEON Technology Inc reserves the right to make improvements to the products described in this manual at any time without notice No part of this manual may be reproduced copied translated or transmitted in any form or by any means without the prior written permission of AAEON Technology Inc Information provided in this manual is intended to be accurate and reliable However AAEON Technology Inc assumes no responsibility for its use nor for any infringements upon the rights of third parties which may result from its use Acknowledgements AMI is a trademark of American Megatrends Inc IBM PC AT PS 2 and VGA are trademarks of International Business Machines Corporation Intel is a trademark of Intel Corporation Microsoft Windows and MS DOS are registered trademarks of Microsoft Corp Datatronics DataSystem DataTalk and abcFAX are trademarks of Datatronics Technology Inc MNP is a trademark of Microcom Inc Cheyenne and BitWare are trademarks of Cheyenne Communications Inc Names of computers and software are trademarks of the respective owners Part No 2007360000 PCM 3600 Rev Al Ist Edition Printed in Taiwan December 1996 Packing list Before you begin installing your card please make sure that the following materials have been shipped e 1 PCM 3600 P
5. Command amp F loads the factory default profile FDP into the mo dem s Active Configuration Area ACA Your modem then func tions using the FDP paramters When the FDP is in ACA without being changed you may view the FDP settings by issuing command amp V amp FO Restore factory FDPO default to ACA amp Fl Restore factory default FDP1 Guard Tone Selection amp G The command amp G lets you select the guard tone in CCITT V 22 and V 22bis mode It is effective only in these modes The guard tone is not required by the Bell protocol amp G0 Disables guard tone transmission amp G1 Selects the guard tone of 550 Hz amp G2 Selects the guard tone of 1800 Hz Leased or Dial Up Line Selection amp L This command selects either dial up line or leased line operation for the modem amp LO Sets the modem for dial up line operation amp L1 Sets the modem for leased line operation dedicated between two destinations 42 PCM 3600 User s Manual Asynchronous or Synchronous Mode Selection amp M This command is issued depending on whether you want to use the modem in synchronous or asynchronous communications mode Your modem may not provide all of the commands listed below Check your Getting Started manual to see which of the following commands your modem provides amp MO Sets the modem to asynchronous mode to accept the asynchronous commands amp M1 Sets the modem to synchronous mode 1 the asynchronous diali
6. The NVRAM is a special type of read write memory element which can retain data even when the power is turned off Your modem s NVRAM retains configuration profiles and telephone numbers The NVRAM does not require a back up battery so that you can eliminate the threat of data loss due to a dead battery as well as avoid Chapter 2 Modem Fundamentals 15 hardware damage due to electrolyte leakage Factory Default Profile FDP The FDP is the default configuration profile stored in your modem s read only memory ROM which can not be modified by the user The FDP is intended for rescuing the modem in case the user miscon figures the modem s settings To display the FDP use command amp F to place the profile into the active configuration area ACA then issue AT amp V Note that some modems may have more than one built in FDP in which case each FDP serves as the default for a particular application requirement Stored Configuration Profile SCP The SCP is the configuration profile stored in the NVRAM of the modem to be retrieved for later use Initially the factory sets the SCPs identically to the FDPs To view all the SCP configurations issue command amp V note that once an SCP is selected and loaded into ACA it becomes the major SCP and provides the control characteristics of the modem If you hav edited the ACA and wish to write it to an SCP issue a amp W command The modified configuration profile overwrites
7. V1 Displays DTE speed and enables V 42 MNP error Chapter 5 ECDC and Extended Commands 57 correction response codes without specifying whether or not the connection is with data compression The REL identifier means the modem is in reliable link error correction V 42 with or without data compression MNP Class 5 V 42bis The NOR identifier means the modem is in normal link V2 Displays DCE speed and enables V 42 MNP error correction response codes without specifying whether or not the connection is with data compression The REL identifier means the modem is in reliable link error correction V 42 with or without data compression MNP Class 5 V 42bis The NOR identifier means the modem is in normal link V3 Displays DTE speed and enables MNP V 42 error correction response codes with data compression indication REL COMP means it is in MNP Class 5 mode while V 42BIS means it is in V 42bis mode V4 Displays DCE speed and enables MNP V 42 error correction response codes with data compression indication REL COMP means it is in MNP Class 5 mode while V 42BIS means it is in V 42bis mode V5 Displays DTE speed disable V42bis MNP extended response code code number 12 or higher Note that when command VO V2 or V4 is in effect the speed displayed is the DCE speed For example CONNECT 2400 means the modem is on line at 2400 bps On the other hand when command V 1 or V3 is in effect the speed displ
8. telephone system unless the system is proven to perform well under data transmission conditions The Communications Software Configuration Your modem follows the standard modem command set Most of the popular communications software packages work with your modem If you have any problem using the software please contact your software dealer publisher or modem dealer To install the software turn on your computer and modem and boot the communications software Follow the software manual s instruc tions to execute software installation Software configuration procedures vary with each software program computer and application Refer to your software manual for more information If you experience any difficulty consult your dealer When installing the software pay particular attention to the following parameter settings as many beginners fail to successfully set them correctly 6 PCM 3600 User s Manual 1 The serial port number 2 The communications protocol 3 The data format including data bit stop bit and parity The serial port specified in your communications software must match the serial port to which the modem is actually connected No matter whether it is COM1 COM2 COM3 or COM4 a port can be only be connected to one peripheral device and should be specified so Otherwise the two devices will conflict with one another or your computer will not be able to find the proper COM port or other device To
9. Character S5 usennen 63 Wait Time Before Dialing S6 en 63 Wait for Carrier After Dial S7 en 64 Pause Time for a Comma Dial Modifier S8 64 Carrier Detect Response Time S9 ee 64 Loss of Carrier to Hang Up Delay S10 64 Touch Tone Dialing Speed S11 neeesser 65 Escape Code Guard Time S12 nsee 65 Test Timer S18 sai sict held gee aires we ek 65 Delay to DTR IS25 arnein 381220 en 65 RTS to CTS Delay Interval S26 en 66 Wait for Connection Password S48 eeeen 66 Diagnostic Tests 67 MODEM DIAGNOSTIC TESTS 0220020020020000002002000000 68 Preliminary Diagnostic Guide u 22220r sn snnensennnnenen nn 68 Using The Test Timer S18 ssnnen 69 Ending a Test ITO sau 69 Local Analog Loopback Test amp T1 0 69 Local Digital Loopback Test amp T3 0 70 Grant or Deny RDL Request amp TV amp TS 70 Remote Digital Loopback Test amp T6 70 Remote Digital Loopback with Self Test amp T7 71 Local Analog Loopback with Self Test amp T8 71 Modem Response Codes enen 73 Modem Response Codes
10. ST This command determines the parameters required for fax communi cation operation The following is a list of the values and meanings of each of the parameters PCM 3600 User s Manual VR Vertical Resolution BR 0 Nomal mode 98 lines per inch 1 Fine mode 196 lines per inch Bit Rate WD 0 2400bps CCITT V 27ter 1 4800bps CCITT V 27ter 2 7200bps CCITT V 29 or V 17 3 9600bps CCITT V 29 or V 17 4 12000bps CCITT V 17 5 14400bps CCITT V 17 Page Width LN 0 1728 pixels in 215 mm Page Width DF 0 Adsize 297mm 2 Unlimited length Data Compression Format EC 0 1 D modified Huffman Error Correction BF 0 Disable error correction Binary File Transfer 0 Disable binary file transfer Appendix B Command Codes 79 80 ST Scan Time per Line 0 Oms VR normal Oms VR fine 1 5ms VR normal Sms VR fine 2 10ms VR normal Sms VR fine 3 10ms VR normal 10ms VR fine 4 20ms VR normal 10ms VR fine 5 20ms VR normal 20ms VR fine 6 40ms VR normal 20ms VR fine 7 40ms VR normal 40ms VR fine To display the current FDCC parameter settings issue command FDCC 9 Local ID String FLID Syntax FID lt local ID string gt This command sets the local ID to the faxmodem The command syntax is FLID lt local ID string gt where the local ID string can be up to 20 printable ASCII character ASCII value 32 to 127 To display the current local ID faxmodem
11. a reliable link command A sets the maximum ECDC block size as follows AO Block size 64 characters Al Block size 128 characters A2 Block size 192 characters A3 Block size 256 characters Transmit Break B Range 0 9 Units 100 ms Default 3 300 ms This command instructs the modem to transmit a break signal to the remote system In direct link the length of the break depends on the value of n For example B1 indicates a break of 100 milliseconds while B2 means 200 milliseconds and so forth In a reliable link the length of the break is a constant 300 millisec onds regardless of the value of n If either B or BO is issued the modem sends a fixed 300 milliseconds break to the remote system 52 PCM 3600 User s Manual Auto Reliable Buffer Option C Command C determines how the modem handles the data it receives during the initial waiting period when it is answering a call in auto reliable mode CO Cl C2 Instructs the modem not to buffer data during auto reliable connection All the data received during this period will be discarded Instructs the modem to buffer the data it receives during the waiting period If a reliable link is established the modem discards the data If the waiting period 4 seconds expires or there has been 200 characters buffered the modem falls back to normal mode and passes the buffered data to the local computer Instructs the modem not to buffer data and immediat
12. amp Z2 913 0792 Save 913 0792 to STN2 ATDTS 2 Dial 913 0792 STN2 ATDT886 2S 2 Dial 886 2 913 0792 8862 plus STN2 ATDTS 2NS 4 Dial STN2 If STN2 is busy swap dial STN When the dial modifier S n is used the command buffer counts the S n as only 3 characters Do not confuse this dial modifier command with the register com mand Sr or SR n The dial modifier S must be preceded by a dial command D DT or DP Read Register Sr Issuing command Sr Displays the content of register S For example ATS7 displays the value stored in register S7 You may read multiple registers at a time For example ATS5 S7 displays both the values in register S5 and S7 Set Register Sr n Command SR n changes the value of register r to n For example ATSO 3 sets register SO to 3 When the modem is turned off or is reset by command ATZ all the register values resume to the default values If you want to save the changes for further use you should issue command amp W to save the value to SCP PCM 3600 User s Manual Touch Tone Dialing IT Inserting command T before a telephone number instructs the modem to tone dial the number The speed of tone dialing is determined by register S11 which is set to default at about 5 26 digits per second You may insert command T anywhere in a dial command line even between digits to have the modem tone dial the following digits For example the command line AT DP 9 T 913 0792 instruct
13. an equalizer retrain sequence at the same speed This is used when bit error rates are excessive and a retrain may reduce the errors attributed to a loss of equalization Note that this command is effective only at 2400 bps or above 02 Causes the modem to enter on line data state and initiates a V 32 forward speed retrain sequence 03 Causes the modem to enter on line data state and initiates a V 32 backward speed retrain sequence Pulse Dialing P Inserting command P before a telephone number instructs the modem to use pulse dialing to dial the number You may insert P anywhere in a dial command line even between digits For example the com mand line AT DT 9 P 913 0792 instructs the modem to tone dial 9 wait for two seconds comma character then pulse dial the number 913 0792 Response Codes Control Q This command enables or disables the sending of a response codes after a command line is executed QO Enable the sending of response codes Ql Disable the sending of response codes This feature is useful when the modem is connected to a printer that may print out undesired response codes characters Reverse Dialing IRI Dial in dialing Tone and then change to answering mode after connection Alan 38 Dial the Stored Number IS n Issuing dial modifier S n after the dial command D instructs the modem to dial the stored telephone number STN previously saved with the amp Z command For example AT
14. from poor quality telephone lines It is advisable that you have a good direct line without PBX for your modem Listed below are hints regarding the diagnostic tests Note that all the tests should be initiated when the modem is in synchronous command state with both the computer and the modem set to full duplex operation 1 To determine a failure due to the modem Perform LALST test This test verifies the modem itself 2 To determine a failure due to the computer Perform LAL and LALST tests If the LAL test fails but the LALST passes the computer or the path is likely at fault 3 To determine a failure due to a faulty telephone circuit 68 PCM 3600 User s Manual Perform LAL and RDLST tests to both the local and remote modems If both the modems pass the LAL test but fail the RDLST test the telephone circuit is probably at fault Using The Test Timer S18 Register S18 determines the duration of all the self tests When the S18 time expires the modem automatically stops the test and returns to command state The default of S18 is zero which disables the test timer Ending a Test amp TO A test may be terminated at any time by issuing the escape sequence which causes the modem to enter the command state and then issuing AT amp TO Any command following amp TO in a command line is ignored Local Analog Loopback Test amp T1 The local loopback test LAL verifies the path between your comput er and you
15. functions of traditional plug in expansion cards but save space and valuable slots Modules include e PCM 3335 386 CPU Module w Flat Panel CRT Interface PCM 3600 FAX Modem Module e PCM 3420 Fast SCSI 2 Module PCM 3200 Sound Module e PCM 3810 Solid State Disk Module e PCM 3820 High Density Flash Disk Module e PCM 3115 PCMCIA Module two slots e PCM 3610 Isolated RS 232 and RS 422 485 Module e PCM 3660 Ethernet Module e PCM 3718 30 KHz A D Module e PCM 3724 48 Channel DIO Module e PCM 3910 Breadboard Module Installing these modules on the CPU card is quick and simple The following steps show how to mount the PC 104 modules 1 Remove the CPU card from your system paying particular attention to the safety instructions already mentioned Make any jumper or link changes required to the CPU card now Once the PC 104 module is mounted you may have difficulty in accessing these Normal PC 104 modules have male connectors and mount directly onto the main card However to ensure better bus matching the connectors on the CPU card and the PC 104 module are both female For this reason you may need to use the male male adapter included with the CPU card in order to properly connect your PC 104 module Refer to the diagram on the following page Mount the PC 104 module onto the CPU card by pressing the module firmly but carefully onto the mounting connectors Secure the PC 104 module onto the CPU c
16. string issue FLID 10 Request Model Identification FMDL This command instructs the faxmodem to send one or more lines of information text which is used to identify the product The informa tion text can not exceed 2048 characters 11 Manufacturer Identification FMFR This command instructs the faxmodem to send one or more lines of information text which is used to identify the manufacturer The information text can not exceed 2048 characters PCM 3600 User s Manual 12 Minimum Phase C Speed FMINSP This command determines minimum Phase C speed which is the lowest negotiable speed for a session The following is a list of the meanings for n value Value ofn Meaning 0 2400bps CCITT V 27ter 1 4800bps CCITT V 27ter 2 7200bps CCITT V 29 or V 17 3 9600bps CCITT V 29 or V 17 4 12000bps CCITT V 17 3 14400bps CCITT V 17 To display the current n value issue FMINSP 13 Request Product Revision Identification FREV This command instructs the faxmodem to send one or more lines of information text which is used to identify the version the revision level or data or other pertinent information The information text can not exceed 2048 characters Appendix B Command Codes 81 82 PCM 3600 User s Manual APPENDIX C Installing PC 104 Modules Installing PC 104 modules The CPU card s PC 104 connectors give you the flexibility to attach PC 104 expansion modules These modules perform the
17. the response code and adjust its serial port speed accordingly In normal applications the baud rate adjustment capability of your modem should be enabled so that the DTE speed shall always follow the DCE speed you can issue the J command to turn the serial port adjustment on or off However in a reliable link or a direct link the baud rate adjustment capability may be disabled so that the serial port speed may be different to the on line speed If data comes in faster than it goes out the faster incoming data is stored in the data buffer Therefore when flow control capability is enabled it is advisable that the on line DCE speed be at a rate equal to or higher than the serial DTE port speed Otherwise data may be lost after the buffer is full Chapter 2 Modem Fundamentals 13 Error Correction and Data Compression ECDC Many modems support error correction and data compression ECDC protocols Error correction assures error free data transmis sion because the modem re transmits the incorrect block of data once a transmission error is detected Data compression can increase data throughput which results in savings of transmission time and tele phone bill costs Common ECDC protocols include CCITT V 42 V 42bis and MNP 2 5 The CCITT V 42 recommendation offers an error correction protocol referred to as LAPM Link Access Procedure for Modems which is the modem protocol for point to point communications The CCITT V 4
18. 2bis provides both error correction and data compres sion features In addition to its compatibility to V 42 in error correction V 42bis offers a 4 1 data compression rate so that data can be transferred up to 4 times faster than a non MNP modem For example a 14 400 bps modem can reach a data throughput of 57 600 bps when the compression rate is 4 1 on a V 42bis ECDC link However the true compression rate depends on the pattern of the transmission file As an alternative to CCITT recommendations MNP Class 2 to 4 offers error correction capability while MNP Class 5 offers a 2 1 data compression The MNP protocol was popular before CCITT ECDC protocols were released and there are still some modems using this protocol Note that V 42 V 42bis and MNP are different both in format and operation Two modems must support the same ECDC protocol in order to connect in ECDC mode For example a V 42bis modem connects in V 42bis mode only when the remote modem also supports the V 42bis protocol For example if your modem supports all three ECDC protocols but the remote modem only supports MNP5 the connection can only be established in MNP5 mode You should use the V 42bis recommendations as long as the on line modem at the remote end supports the same This way you can achieve higher data throughput To select the ECDC mode use the 4 A command N Flow Control While on line your modem is between your computer and the remote modem o
19. 4 is in effect CONNECT 2400 Connection has been successfully established at 2400 bps enabled when X1 X2 X3 or X4 is in effect CONNECT 4800 PCM 3600 User s Manual 12 13 14 15 16 17 Connection has been successfully established at 4800 bps enabled when X1 X2 X3 or X4 is in effect CONNECT 9600 Connection has been successfully established at 9600 bps enabled when X1 X2 X3 or X4 is in effect CONNECT 7200 Connection has been successfully established at 7200 bps enabled when X1 X2 X3 or X4 is in effect CONNECT 19200 Connection has been successfully established at 19200 bps enabled when X1 X2 X3 or X4 is in effect CONNECT 14400 Connection has been successfully established at 14400 bps enabled when X1 X2 X3 or X4 is in effect CONNECT 38400 Connection has been successfully established at 38400 bps enabled when X1 X2 X3 or X4 is in effect CONNECT 57600 Connection has been successfully established at 57600 bps enabled when X1 X2 X3 or X4 is in effect Modem ECDC Response Codes The following MNP and V 42 response codes appear after executing a command line Note that the following response codes are enabled depending on the V command when X1 X2 X3 or X4 are in effect In MNP mode the identifier REL denotes the modem is in reliable link with error correction while REL COMP denotes both error correction and data compression are enabled In CCITT V 42bi
20. 400 bps in reliable mode with data compression CONNECT 38400 V42BIS REL COMP Connection has been successfully established at 38400 bps in reliable mode with data compression CONNECT 57600 V42BIS REL COMP Connection has been successfully established at 57600 bps in reliable mode with data compression CONNECT 300 NOR Connection has been successfully established at 300 bps in normal mode CONNECT 600 NOR Connection has been successfully established at 600 bps in normal mode CONNECT 1200 NOR Connection has been successfully established at 1200 bps in normal mode CONNECT 2400 NOR Connection has been successfully established at 2400 bps in normal mode CONNECT 2400 NOR Connection has been successfully established at 2400 bps in normal mode CONNECT 4800 NOR Connection has been successfully established at 4800 bps in normal mode PCM 3600 User s Manual 45 CONNECT 9600 NOR Connection has been successfully established at 9600 bps in normal mode 46 CONNECT 19200 NOR Connection has been successfully established at 19200 bps in normal mode 47 CONNECT 7200 NOR Connection has been successfully established at 7200 bps in normal mode 48 CONNECT 14400 NOR Connection has been successfully established at 14400 bps in normal mode 49 CONNECT 38400 NOR Connection has been successfully established at 38400 bps in normal mode 4A CONNECT 576400 NOR Connection has been successfully established at 57600 bps in norma
21. 6400bps Connection at 26400bps in 1E CONNECT 28800bps Connection at 28800bps in 2C CONNECT 16800 V42 Connection at 16800bps in reliable mode error correction only 2D CONNECT 21600 V42 Connection at 21600bps in reliable mode error correction only 2E CONNECT 115200 V42 Connection at 115200bps in reliable mode error correction only 2F CONNECT 24000 V42 Connection at 24000bps inreliable mode error correction only 76 PCM 3600 User s Manual APPENDIX Command Codes U Command Codes 78 1 Fax Auto Answer FAA This command instructs the faxmodem to auto answer in data mode or in fax mode FAA 0 Auto answer as a faxmodem of the type specified by FCLASS FAA 1 Automatically determine s whether to answer as fax or data modem 2 Service Class Indication FCLASS This command determines whether the faxmodem is in fax modem or data mode It also indicates the service class of the fax command set FCLASS 0 Data mode FCLASS 2 Class 2 mode FCLASS Inquire service class capability FCLASS Inquire service class identification 3 Capability to Receive FCR This command inquires about the capability of the receive function FCR 0 Indicates the faxmodem will not receive message data the faxmodem will not be able to poll a remote device FCR 1 Indicates the faxmodem can receive message data 4 Fax Capability Parameter FDCC Syntax FDCC VR RB WD LN DF EC BF
22. C 104 Fax Modem module e 1 PCM 3600 user s manual e 1 Fax Data software disk and users guide e 1 RJ 11 cable e 1 PCM 3600 driver disk for Windows 95 e packet of screws and supports for PC 104 module If any of these items are missing or damaged contact your distributor or sales representative immediately 4 Contents Unpacking and Installation 1 Introduction oo ds pisecsciecacceccucseassercoecssasnaeeenseacseveucestwuscctseuseoeosees 2 Unpacking And Installation scsssccsssscssssesssscsssecssssees 3 A Look at the Modem Card u0sssessssessnseensnnensnnnnnnn 3 The Serial Port and Interrupt of the Modem Card 4 Setting the COM Port and Interrupt of the Modem Card 4 Installing the Modem Card 0 0 0 eeceeeceneeereeeneeeneeeseeeseeeaes 5 Testing the Telephone Line Prior to Connection 6 The Communications Software Configuration 0 0 00 6 Software Configuration Tips 222u2220022ensensennnesnne seen 7 Getting Started reece a hr ern ee aers tte 8 Modem Fundamentals uusuerrs seen 9 Modem Fundamentals rseesosssssssnesnesnenesnssnnsnensennenesnennnne 10 Modemi Basiese ernennen iiaa i e aas 10 Data HOT airera e a e e eE A E etehe eee ees 10 Communications Protocols ssssssssssesssessseeseesseessessssesssesses 11 Speeds of the Modem 22002200220ssesnnesnnennennnnennnennnennnennne 12 On Line S
23. CCITT protocol to establish connection with the remote modem AT amp PIDP Pulse dials with the make break ratio of 33 67 for use in most European countries AT amp PODP Pulse dials with the make break ratio of 39 61 for use in the USA You may use any command or combination you need Refer to the chapters in this manual regarding modem commands for more details Getting Started Now you can dial a bulletin board data base or remote computer Your modem establishes the connection automatically Once there is a connection you can 1 read or send electronic mail 2 view up to date news or information 3 upload or download computer programs 4 transmit or receive a text message or spread sheet data or perform whichever on line data communication tasks you require Note that the remote modem should be set to accept digital loopback request by issuing AT amp T4 8 PCM 3600 User s Manual Modem Fundamentals CHAPTER NO Modem Fundamentals This chapter provides a brief overview of how modems work Modem Basics Modems let computers communicate with other computers using normal telephone lines or leased lines Your modem sends communi cations by modulating converting data into sound waves that a telephone can transmit and another modem can receive Your modem receives communications by demodulating sound waves from the telephone into data your computer can recognize The term modem is an abbreviated
24. ECT 19200 V42bis Connection at 19200bps in ECDC mode 47 CONNECT 7200 V42bis Connection at 7200bps in ECDC mode 48 CONNECT 14400 V42bis Connection at 14400bps in ECDC mode 49 CONNECT 38400 V42bis Connection at 38400bps in ECDC mode 4A CONNECT 57600 V42bis Connection at 57600bps in ECDC mode Appendix A Modem Response Codes 75 4B CONNECT 12000 V42bis Connection at 12000bps in ECDC mode 60 CONNECT 300 NOR Connection at 300bps in normal mode 61 CONNECT 600 NOR Connection at 600bps in normal mode 62 CONNECT 1200 NOR Connection at 1200bps in normal mode 63 CONNECT 2400 NOR Connection at 2400bps in normal mode 64 CONNECT 4800 NOR Connection at 4800bps in normal mode 65 CONNECT 9600 NOR Connection at 9600bps in normal mode 66 CONNECT 19200 NOR Connection at 19200bps in normal mode 67 CONNECT 7200 NOR Connection at 7200bps in normal mode 68 CONNECT 14400 NOR Connection at 14400bps in normal mode 69 CONNECT 38400 NOR Connection at 38400bps in normal mode 6A CONNECT 57600 NOR Connection at 57600bps in normal mode 6B CONNECT 12000 NOR Connection at 12000bps in normal mode Modem Response Codes continued Code in Digit and Word Form Meanings of the Response Code 19 CONNECT 16800bps Connection at 16800bps 1A CONNECT 21600bps Connection at 21600bps 1B CONNECT 115200bps Connection at 115200bps 1C CONNECT 24000bps Connection at 24000bps 1D CONNECT 3
25. ECT 38400 V42 REL Connection has been successfully established at 38400 bps in reliable mode with or without data compression CONNECT 57600 V42 REL Connection has been successfully established at 57600 bps in reliable mode with or without data compression CONNECT 300 V42BIS REL COMP Connection has been successfully established at 300 bps in reliable mode with data compression CONNECT 600 V42BIS REL COMP Connection has been successfully established at 600 bps in reliable mode with data compression CONNECT 1200 V42BIS REL COMP Connection has been successfully established at 1200 bps in reliable mode with data compression CONNECT 2400 V42BIS REL COMP Connection has been successfully established at 2400 bps in reliable mode with data compression CONNECT 4800 V42BIS REL COMP Connection has been successfully established at 4800 bps in reliable mode with data compression CONNECT 9600 V42BIS REL COMP Connection has been successfully established at 9600 bps in reliable mode with data compression Nam 28 36 37 38 39 3A 40 41 42 43 43 44 CONNECT 19200 V42BIS REL COMP Connection has been successfully established at 19200 bps in reliable mode with data compression CONNECT 7200 V42BIS REL COMP Connection has been successfully established at 7200 bps in reliable mode with data compression CONNECT 14400 V42BIS REL COMP Connection has been successfully established at 14
26. The speed over the telephone line at which your modem communi cates with the remote modem is called the on line speed Since the modem is Data Communications Equipment the communications speed is called the DCE speed On the other hand the speed over the serial port at which your modem communicates with the local computer is called the serial port speed Since the computer is Data Terminal Equipment it is called the DTE speed On Line Speed DCE Speed Your modem supports one or more communication protocols depending on its modem type When your modem answers a call and establishes a connection it adjusts its speed according to that of the calling modem As a result the speed at which the calling modem dials becomes the on line speed 4 Serial Port Speed DTE Speed Each time the modem receives a command string from the computer the AT prefix instructs the modem of the serial port speed This speed remains as the active serial port speed i e the active speed DTE speed For example if your modem is set at 2400 bps and the remote modem is calling at 1200 bps the connection is established at 1200 bps Your modem sends the response code CONNECT 1200 at 2400 bps to the local computer and then adjusts its DTE speed to 1200 bps Your modem will no longer recognize characters received from the local computer at 2400 bps If you are writing communications software be sure to have the local computer determine the speed from
27. ange 0 9 or0 3 Enable modem to Auto dial the n th STN and make connection when power is on A99 Disable Auto dial at power on function 40 PCM 3600 User s Manual CD Option amp C This command determines how the modem reacts to the conditions of a CD Carrier Detect interchange circuit amp C0 CD is always forced ON amp Cl The modem tracks the data carrier from the remote one and initials CD accordingly amp C2 CD is forced on during command state but it is tracked on connection DTR Option amp D This command determines how the modem reacts to aDTR Data Terminal Ready on to off transition amp DO Instructs the modem to ignore DTR amp D1 Instructs the modem to assume command state upon the detection of a DTR on to off transition but maintain an active line connection amp D2 Instructs the modem to go on hook assume command state and disable auto answer upon the detection of a DTR on to off transition The auto answer function can be re enabled by turning DTR on again amp D3 Instructs the modem to re initialize itself when it detects a DTR on to off transition The ACA will be overwritten by the active SCP amp D4 Instructs the modem to deliver all buffered data before disconnecting to on to off transition This command is only valid in asynchronous mode In synchronous mode a DTR on to off transition always causes the modem to disconnect Alanam _ Load Factory Default Settings amp F
28. ard using the four mounting spacers and srews 84 PCM 3600 User s Manual u o gt PC 104 Mounting Support Female Male CPU Card PC 104 Module PC 104 Module Mounting Diagram 3 500 3 250 3 175 3 5754 3 575 ITIITI En 83338333333333333333 Be Sl 0 200 3 350 7 0 3 550 PC 104 module dimensions inches 5 Appendix C Installing PC 104 Modules 85
29. ates both the command line and the response code Line Feed Character S41 Range 0 127 Unit ASCII Default 10 The register S4 stores the decimal ASCII value of the line feed character which follows a carriage return after a response code is sent You may have to set this register to a different value if a non standard DTE is used Backspace Character S51 Range 0 32 Unit ASCII Default 8 The register S5 stores the decimal ASCII value of the backspace character which is used as the backspace key for editing and as the character echoed to move the cursor backwards on the screen Wait Time Before Dialing S6 Range 2 255 Unit Second Default 2 Register S6 determines how long the modem waits after off hook before it proceed to dial This delay allows the central office to detect the off hook status of the line and apply a dial tone If it is set too short the modem may start dialing too early and the call will not go through because the center office may not receive the first few dialing digits The register is valid only when X0 X1 or X3 is in effect If X2 or X4 is in effect the dial tone detection is enabled and the modem will not blind dial Chapter 6 Modem Registers 63 Wait for Carrier After Dial S7 Range 1 255 Unit Second Default 30 The register S7 determines how long the modem will wait for a remote carrier signal after it dials or answers If a carrier is detected the modem goes on line Otherwis
30. ayed is the serial port DTE speed Thus CONNECT 2400 means the serial port speed is set at 2400 bpline speed accord ing to the serial port speed 58 PCM 3600 User s Manual XON XOFF Pass Through X This command determines whether the modem passes the XON XOFF characters it receives to the local computer or to the remote modem to further process the characters It is valid only in normal or reliable mode X0 Disable XON XOFF pass through if flow control is enabled by command Q1 DTE side or G1 modem side If flow control is disabled the XON XOFF characters are always sent as regular data X1 Enable XON XOFF characters pass through to the local computer or to the remote system Note that data is lost if the data transmission from the remote system starts before the modem is ready to receive them Set Auto Reliable Fallback Character I An Range 0 127 Units ASCII Default 13 This command defines the ASCII character to be recognized as the auto reliable fallback character during the initial waiting period when the modem auto answers a call For example command A13 defines the carriage return ASCII 13 as the auto reliable fallback character When a carriage return is received during the initial waiting period the modem immediately goes into normal mode The auto reliable fallback character is recognized only when the modem answers a call in auto reliable AN3 mode and C2 is in effect Set Modem Port Maximu
31. by issuing AT amp T4 The test begins after your modem has sent a carriage return and a line feed Type some character strings on the keyboard such as Once upon a time there was a and see if they appear correctly on the screen If errors are found either your computer your modem the remote modem or the telephone circuit is at fault You can initiate LAL tests at both the local and remote sides to further isolate the problem Remote Digital Loopback with Self Test amp T71 The RDLST test verifies the local modem the telephone circuit and the remote modem In this test your modem sends a self generated test message to the remote modem The remote modem loops the test PCM 3600 User s Manual message back to your modem Your modem then compares the received string with the original message to verify the path To initiate the test for example you may issue either the following command lines when on line in asynchronous command state AT S18 0 amp T7 With test timer disabled AT S18 30 amp T7 Set test timer to 30 seconds The test will begin after the modem has sent a carriage return and a line feed To terminate the test when S18 is set to zero use the escape sequence to exit the modem to command state and issue command AT amp TO The modem will respond with the number of errors detected within the time interval A value of 000 means no errors while 255 means 255 or more errors Local Analog Loopback with Self Test I am
32. communicate successfully the protocol and data format of the two modems on line must be identical For example if the bulletin board you are going to dial supports Bell standard 8 data bits no parity 1 stop bit you should specify this set up exactly Otherwise the connection will be unsuccessful and any data received will be unreadable garbled Software Configuration Tips For most PC data communication applications using up to date communication software the factory default settings are sufficient However you may have to reconfigure your modem if this is not the case Almost all compatible software applications use a similar dialing prefix command summary If required you can use the command summary to overwrite modem parameters Most popular communication software packages allow users to specify a command string and the dialing prefix that is sent to the modem prior to dialing telephone number digits The dialing prefix reconfigures the modem according to your commands Below are some examples of a dialing prefix string ATSO 3 Instructs the modem to auto answer an incoming call on the third ring Chapter 1 Unpacking and Installation 7 ATX4DT9W Instructs the modem to first tone dial the number 9 and hold it until a dial tone is detected ATS6 10DP Instructs the modem to wait for 10 seconds before proceeding to dial ATM2L3DT Turns on the modem monitoring speaker at all times and uses high volume ATBODTUses the
33. computer s installation guide 3 Plug in your PC 104 modem to the expansion slot and make sure the connectors of the modem card are exactly aligned with the expansion slot 4 Secure the modem card to the computer with screw 5 Connect the telephone line from the wall outlet to the jack labeled LINE 6 Connect the line from your telephone to the jack labeled PHONE You may leave the PHONE jack unconnected CAUTION Handle the card only by its edges The card s precision components are easily damaged by static electricity or abuse The metal bracket of the modem card should rest firmly on the rear panel bracket of the computer If not remove the modem card and try again Chapter 1 Unpacking and Installation 5 Testing the Telephone Line Prior to Connection The quality of the telephone line significantly affects the reliability and quality of data communications Make sure that both the tele phone system and telephone line are in good order before the modem is connected Test the line by lifting the telephone handset and listening for a clear dialtone Try placing a few calls Ifthe calls do not go through well or are not loud and clear you may have a poor quality telephone line In this case find a better quality line for your modem to ensure reliable data communications We strongly recommend that you connect the modem directly to an outside telephone line Do not connect your modem to a Private Branch Exchange PBX
34. e it disconnects and responds with the NO CARRIER Pause Time for a Comma Dial Modifier S8 Range 0 255 Unit Second Default 2 Register S8 determines how long the modem pauses for a comma command For example command line ATDP9 782 0002 instructs the modem to dial the PBX access number 9 then to pause for 2 seconds before it proceeds to dial 782 0002 You can use more than one comma command for a longer delay Carrier Detect Response Time S91 Range 1 255 Unit 0 1 Second Default 6 The register S9 determines how long a carrier signal must continuous ly exist before it is recognized as a valid signal by the modem A longer S9 time gives the modem more time to distinguish the carrier signal from noise Loss of Carrier to Hang Up Delay S101 Range 1 255 Unit 0 1 second Default 14 The register S10 determines how long the modem waits before hanging up after it detects a loss of carrier This delay permits the carrier to momentarily disappear without causing the modem to disconnect If this register is set to 255 the modem ignores carrier status as though a carrier was always present It is advisable to always set S10 to a value longer than S9 The actual length of time that can be tolerated by a carrier for momentary loss is the difference between S10 and S9 64 PCM 3600 User s Manual Touch Tone Dialing Speed S11 Range 50 255 Unit Millisecond Default 95 The register S11 determines the speed of touch tone diali
35. e from the wall outlet 3 Smart dumb mode select jumper J6 4 IRQ select jumper J4 5 Com port address slect jumper J5 6 PC 104 ISA bus Chapter 1 Unpacking and Installation 3 The Serial Port and Interrupt of the Modem Card You can use any COM port COMI to COM4 See your computer manual for the number of ports on your computer Computers use interrupts IRQ to control the data flow between computers and peripherals An interrupt signals data to flow or to stop much like a traffic light controls the flow of traffic Each serial port needs an interrupt to control that particular port Setting the COM Port and Interrupt of the Modem Card Your modem is factory set for use on COM2 with IRQ3 If you choose to use it with another serial port or interrupt you need to change the COM jumper and IRQ jumper Make sure the port and interrupt set up you use are not used by any other peripheral The COM IRQ settings should appear as in the diagram below If you have any questions about setting a port for your modem consult your dealer Fig 1 2 Fax Modem Module COM IRQ Setting 4 PCM 3600 User s Manual Installing the Modem Card The modem card is designed for reliability but it should be kept away from static electricity shock heat and humidity Install the modem into your computer as follows 1 Turn off the computer 2 Remove the cover of your computer and locate the PC 104 expansion slot Refer to your
36. eliable mode error correction only 21 CONNECT 600 V42 Connection at 600bps in reliable mode error correction only 22 CONNECT 1200 V42 Connection at 1200bps in reliable mode error correction only 23 CONNECT 2400 V42 Connection at 2400bps in reliable mode error correction only 24 CONNECT 4800 V42 Connection at 4800bps in reliable mode error correction only 25 CONNECT 9600 V42 Connection at 9600bps in reliable mode 74 PCM 3600 User s Manual error correction only 26 CONNECT 19200 V42 Connection at 19200bps in reliable mode error correction only 27 CONNECT 7200 V42 Connection at 7200bps in reliable mode error correction only 28 CONNECT 14400 V42 Connection at 14400bps in reliable mode error correction only 29 CONNECT 38400 V42 Connection at 38400bps in reliable mode error correction only 2A CONNECT 57600 V42 Connection at 57600bps in reliable mode error correction only 2B CONNECT 12000 V42 Connection at 12000bps in reliable mode error correction only 40 CONNECT 300 V42bis Connection at 300bps in ECDC mode 41 CONNECT 600 V42bis Connection at 600bps in ECDC mode 42 CONNECT 1200 V42bis Connection at 1200bps in ECDC mode 43 CONNECT 2400 V42bis Connection at 2400bps in ECDC mode 44 CONNECT 4800 V42bis Connection at 4800bps in ECDC mode 45 CONNECT 9600 V42bis Connection at 9600bps in ECDC mode 46 CONN
37. ely switches itself to normal mode upon receiving the auto reliable fallback character defined by A command In this case the data received prior to the auto reliable fallback character is discarded and the fallback character is passed on to the computer Note that this command is valid only when the modem is in answer mode If the modem is in originate mode it ignores the Cn setting and does not buffer data during the ECDC handshake period Chapter 5 ECDC and Extended Commands 53 Flow Control in Normal link G This command enables or disables the XON XOFF flow control on the communications port in a normal link An XOFF signals the remote modem to stop sending data while an XON resumes the sending GO Disables XON XOFF flow control on modem s communications port G1 Enables the flow control on a modem s communications port In a direct link no flow control is used In a reliable link a special default scheme of flow control is used In both cases Gn is ignored Serial Port Baud Rate Adjustment J1 This command turns the serial port baud rate adjustment capability of the modem on or off JO Turns off the serial port baud rate adjustment The serial port speed is fixed regardless of the on line speed This is used when the modem is in normal or reliable link when flow control is disabled J1 Turns on the serial port baud rate adjustment capability The modem automatically adjusts its serial port speed to
38. ence The escape sequence instructs the modem to leave escape the data state and enter the command state without breaking the connection It is the only data string that is interpreted as acommand when the modem is in data state After switching to command state the user can issue further com mands such as changing parameter settings etc To resume data state simply issue ATO The escape command in default is three consecutive characters For the modem to distinguish the escape command from the data a certain duration of guard time is defined to exist both prior to and after the three consecutive escape characters The escape sequence includes a guard time three consecutive escape characters and a guard time in that order The default guard time is 1 second It can be changed by assigning a different value to register S12 PCM 3600 User s Manual In the same manner you may change the escape character to a different one by assigning the ASCII value in decimal of the new escape character to register S2 Issuing Commands When the modem is in command state you can issue commands to the modem by typing them on the keyboard A command line shall always begin with AT or at followed by the command or com mands and completed with a return key The only exception is A which does not require the AT prefix and a return key Some commands such as M1 M2 or M3 require a parameter after the command letter I
39. er the escape command Do not press the return key 3 Wait for another second of guard time without typing or transferring anything Upon recognition of the escape sequence the modem sends the OK response code and escapes to command state The default escape character is ASCII 43 and the default guard time is one second You can change them by changing the values in registers S2 and S12 respectively Flash exclamation The command instructs the modem to go on hook for 1 2 second and then off hook This command is used for call transferring Return to Command State semicolon Ending a dial command line with command semicolon instructs the modem to enter command state after dialing rather than go on 66 99 line into data state You may have other commands following the PCM 3600 User s Manual character in the same command line Ring Control Bl This command enables or disables the ring generated through the modem speaker when an incoming ring is detected BO Disables the speaker ring 50 PCM 3600 User s Manual CHAPTER 5 ECDC and Extended commands ECDC and EXTENDED COMMANDS This chapter explains ECDC commands and Extended commands which are in addition to the basic modem commands listed in the previous chapter Some commands have a factory default setting Refer to your Getting Started manual for information on default settings Maximum ECDC Block Size Al In
40. etects data transmission errors and corrects them on line With the installed data compression functions data throughput is up to four times as fast as a modem without this feature Consequently when on line in V 32bis with V 42bis enabled the data transfer rate can reach 57 600 bps so your data communications can be completed in only a fraction of the time and cost Your PCM 3600 is a faxmodem providing full featured send and receive fax communication capabilities It supports CCITT V 17 V 29 and V 27ter fax protocols at the highest speed of 28 800 bps and downward compatible to 14 400 bps and below You may run fax communication software on your computer to directly send or receive fax messages with millions of the fax machines around the world Data communication is highly essential in today s world We wel come you to our product and services and sincerely hope you enjoy your new modem 2 PCM 3600 User s Manual UNPACKING AND INSTALLATION The complete modem package should include 1 The modem unit 2 This user s manual 3 An RJ 11 to RJ 11 phone cable 4 Data and fax communications software optional 5 Windows 95 Driver Carefully inspect the package for shipping damage If damage is found repack the modem in the original packing material and contact your dealer A Look at the Modem Card Fig 1 1 PCM 3600 Fax Modem Module 1 Jack for connecting 2 Jack for connecting to the telephone lin
41. ever the speed dialing command n is counted as 2 digits in the comand buffer while S n is counted as 3 digits regardless of the number of digits stored in the STN Do not confuse this N command with the redial times commands N n or N Set Redial Times IN n Range n 0 15 Unit Times Default 0 This command determines how many times the modem will redial a call if a busy signal is detected The default is N 0 so that the modem does not redial The redial times counter is cleared to 0 after a connection is made command Z or amp F is issued or dialing is aborted by the user Set Redial Interval IN5 nl Range n 0 255 Unit 2 seconds Default 1 This command adjusts the interval between redials For example issuing N5 45 commands the modem to redial a call every 90 seconds Read Redial Times IN Issue command N to display the current setting of your modem s redial times For example if you issue N and the response is 5 it means the redial time is set for 5 times Read Redial Interval N57 Issue N5 to display the interval between two redials For example if you issue N5 and the reesponse is 45 the redial is executed every 90 seconds On Line 0 This command instructs the modem to enter on line data state O Causes the modem to enter on line data state and to resume data transmission with the remote modem 36 PCM 3600 User s Manual Ol Causes the modem to enter on line data state and initiates
42. f the modem turns CTS OFF and resumes when CTS is turned ON PCM 3600 User s Manual Q3 Uses bi directional CTS RTS flow control The data transmission from the local computer to the modem stops when CTS is OFF and resumes when CTS is ON On the other hand the data transmission from the modem to the local computer stops when RTS is OFF and resumes when RTS is ON Q4 The serial port generates but does not respond to XON XOFF flow control characters Q5 Use uni directional flow control just as Q2 does but keeps CTS off until a connection is established Q6 Uses bi directional hardware flow control just as Q3 does but kept CTS off until a connection is established Note that flow control is not used if the modem is in a direct link Similarly the setting of command Q is ignored Inactivity Timer I Tn Range 0 to 255 Unit Minutes Default 0 This command determines after how many minutes the modem hangs up if no data is sent or received during a normal or reliable link This inactivity timer is in effect in normal and reliable link and it must be set before the modem enters the on line state Request Reliable Link U Request remote to accept reliable link MNP Response Code Option V This command determines whether the MNP extended response codes are displayed It also allows display of DCE or DTE speed VO Displays DCE the speed but disables V42bis MNP extended response code code number 12 or higher
43. f the parameter is missing the modem treats the command as having a parameter of 0 For example M would be recognized as MO When multiple commands are issued in a command line you can insert spaces between commands to make the command line easier to read Command Buffer The command buffer has a capacity of 40 characters All the com mands you type on the keyboard are stored in the command buffer before the return key is pressed However the AT or at the carriage return the optional line feed characters and the spaces in the com mand line are not stored in the command buffer The command line stored in the command buffer is not executed until you have pressed the return key If the command buffer overflows the modem sends the ERROR response code upon receiving the carriage return character and all the commands in the command buffer are ignored Deleting Commands If you make a mistake while typing a command line you can press the backspace key to delete the last character you have entered However the backspace key does not delete the AT prefix To delete the entire command line press the backspace key until every command character except AT is deleted Then press the return key You may change the backspace character to another ASCII character by assigning a new value to register S5 For example ATS5 27 designates ESC as the backspace character Modem AT Response Codes Unless you have instructed the modem no
44. ion with a remote modem It denotes either a connection is established at 300 bps when X1 X2 X3 or X4 is in effect or a connection is established at any speed when XO is in effect 2 RING Modem has detected an incoming ring The code RING is displayed on the screen repeatedly as each consecutive ring is detected until the modem goes off Alan 24 hook to answer the call NO CARRIER Modem has either failed to detect a carrier within 45 seconds determined by register S7 while dialing or answering Modem detects a loss of carrier when it is on line with a remote modem or detects a loss of carrier when it is performing a local analog loopback test ERROR Modem has encountered an invalid command when executing the command line stored in the command buffer or an overflow has occurred in the command buffer too many characters were entered into the command line CONNECT 1200 Modem has successfully established a connection with a remote modem at 1200 bps enabled when X1 X2 X3 or X4 is in effect NO DIAL TONE Modem has failed to detect a dial tone enabled by dial modifier W when command X2 or X4 is in effect BUSY Modem has detected a busy signal after dialing a phone number enabled by the dial modifier when X3 or X4 is in effect NO ANSWER Modem has failed to detect a 5 second silence within the 45 second determined by register S7 waiting period enabled by the dial modifier when X3 or X
45. its retained in the modem s NVRAM and used for speed dialing You may use it to save frequently used telephone num bers passwords or credit card numbers To store a telephone number as an STN use amp Z followed by the STN number the sign and the telephone number For example amp Z2 886 2 9130792 stores 88629130792 as STN2 Note that only digits can be stored in STN Other characters or symbols are discarded To view the STN issue command amp V1 To dial an STN issue S n Chapter 2 Modem Fundamentals 17 40 CHAPTER Modem Operation and Response Codes MODEM OPERATION AND RESPONSE CODES 20 This chapter describes modem states commands and response codes and explains how to issue commands to the modem Command State and Data State During operation your modem is either in command state or data state The figure below shows the relationships between the two states and how to enter and abort from each of them In command state the modem interprets all the characters it receives as commands The command state may either be on line or off line When the modem is holding a connection with a remote modem or when it is in an analog loopback test it is on line Otherwise it is off line In data state the modem is a transparent receiving and sending device It assumes everything it receives except the escape sequence as data and conveys them to the local computer or remote system The Escape Sequ
46. l mode 30 PCM 3600 User s Manual Basic Modem Commands CHAPTER BASIC MODEM COMMANDS This chapter describes the basic modem commands in alphabetical order Some commands have factory default settings for which you can refer to your Getting Started manual s Command Summary table Answer Command Range n 0 255 Unit Rings Command A instructs the modem to immediately answer incoming calls The number of rings by which the modem goes off hook to answer is determined by the register SO Alternatively if anumber follows the A command the modem goes off hook to answer on the specified rings For example A3 instructs the modem to auto answer on the third ring The modem will enter data state after a connection is successfully established Attention Code ATI Command AT clears the command buffer and informs the modem of your computer s transmission speed and data format Any command line except A must start with AT prefix and end with a carriage return Repeat the Last Command A Command A instructs the modem to re execute the last command line stored in the command buffer This is the only command that does not need an AT prefix and a carriage return 32 PCM 3600 User s Manual Bell or CCITT Standard B This command is used to select the communications protocols as follows BO Selects CCITT protocol which is used in Europe and most countries in the world Bl Selects Bell protocol which i
47. lish the connection for a total of six seconds before it hangs up This command is valid at speeds 2400 bps or higher 60 PCM 3600 User s Manual CHAPTER Modem Registers MODEM REGISTERS The registers of the modem determine its operation characteristics This chapter describes the modem s registers except for those reserved registers that can not be modified by the user Reading or Changing a Register To read the current contents of a register issue command Sn To change the register s contents use command Sn For example ATS7 Read register S7 ATS7 150 Set register S7 to 150 ATS0 S 16 Read registers SO and S16 Auto Answer Ring Number SO Range 0 255 Unit Ring Default 0 The register SO determines the number of rings before the modem answers a call For example S0 0 Modem will not auto answer calls S0 3 Modem answers incoming calls after the third ring Ring Count S1 The register S1 counts the number of rings on the telephone line when the modem is set to auto answer The register is cleared 8 seconds after the last ring Escape Character S2 Range 0 127 Unit ASCII Default 43 The register S2 stores the decimal ASCII value of the escape charac ter The default value 43 is an ASCII 62 PCM 3600 User s Manual Carriage Return Character S3 Range 0 127 Unit ASCII Default 13 The register S3 stores the decimal ASCII value of thecarriage return character which termin
48. llowed by a carriage return and a line feed Executes the modem s checksum test and sends an OK or ERROR response code accordingly Speaker Volume Control IL This command adjusts the volume of the modem speaker for call progress monitoring when the speaker is turned on LO Ll L2 L3 Selects low speaker volume Selects low speaker volume Selects medium speaker volume Selects maximum speaker volume 34 PCM 3600 User s Manual Speaker On Off Control IM This command turns on or off the modem s speaker for call progress monitoring as follows MO Turns the speaker off at all times MI Turns the speaker on until a connection is established M2 Turns the speaker on at all times even after a connection has been established M3 Turns the speaker on until a carrier is detected but turns the speaker off when the modem is dialing Swap Dialing N Inserting command N between two telephone numbers in a dial command line causes the modem to swap dial the second specified number if the first one is busy For example given the following command line AT DT X4 782 0002 N 788 3380 the modem dials 782 0002 first If 782 0002 is busy the modem swap dials 788 3380 To use swap dialing either X2 or X4 must be in effect so that the modem can detect a busy signal Make sure that the total number of characters in a command line excluding spaces does not exceed 80 If it exceeds 80 the command buffer overflows How
49. m Baud Rate Bn n 300 1200 2400 4800 7200 9600 14400 19200 This command sets the maximum modem port baud rate to the speed specified The default is BO which sets the maximum on line speed according to the serial port speed Chapter 5 ECDC and Extended Commands 59 Data Compression Cl This command enables or disables the data compression V42bis or MNPS5 capability during a reliable link CO Disables data compression It is recommended that the baud rate adjustment be turned off JO for more efficient results C1 Enables V 42bis and MNP Class 5 data compression Delay Before Forced Hang Up Dnl Range 0 to 255 Unit Seconds Default 0 This command determines how many seconds the modem waits before hanging up once it detects the loss of the carrier during on line This ensures that the modem has sent all the data in the buffer before hanging up If the data is not completely sent before time out the response code is NO CARRIER If the data has been sent successful ly the response code is OK Note that when n 255 there is no time out The modem does not stop trying to send the data in the buffer until it hangs up Automatic Retrain E This command determines whether or not the modem automatically initials a retrain when the telephone line quality is poor EO Disables automatic retrain capability El Enables auto retrain When the line quality is poor the modem makes three attempts to re estab
50. match the on line speed the same as a non ECDC ordinary modem will do 54 PCM 3600 User s Manual Set Break Control K Command K determines how the modem reacts to a break signal it receives from the local computer or the remote system When the modem receives a break signal from the local computer in on line data state during a reliable or normal link it reacts as follows Value of nModem response in on line data state 0 2 4 Modem immediately enters command state but does not send a break signal to the remote system 1 Modem clears its buffer and immediately sends a break signal to the remote system 3 Modem immediately sends a break signal to the remote system 5 Modem sends a break signal to the remote system in sequence with the data received from the serial port MNP Linkage Mode Selection L LO Select MNP Data Flow Link L1 Select MNP Data Packet Link ECDC Operation Mode Selection I N This command allows the selection of the ECDC operation modes as follows NO Selects the normal mode N1 Selects the direct mode N2 Selects the ECDC reliable mode N3 Selects the auto reliable mode V 42bis V 42 MNP N4 Selects the V 42 reliable mode only In normal mode NO the error correction function is disabled but the data buffer is activated This mode can be used to communicate with nearly any modem Chapter 5 ECDC and Extended Commands 55 56 In direct mode N1 both error correction a
51. mines how long the modem waits from the time it detects an RTS OFF to ON transition to the time it turns on CTS This register is valid only in synchronous mode while amp RO is in effect Wait for Connection Password S48 Range 0 255 Unit Second Default 15 This register determines how many seconds the modem waits for a connection password after it answers an incoming call If the pasword is not received during this period the modem hangs up 66 PCM 3600 User s Manual CHAPTER Diagnostic Tests MODEM DIAGNOSTIC TESTS There may be times when the modem does not cooperate with you no matter what you do However the modem is probably not at fault Your communications system is made up of many links any one of which may be faulty Problem sources may be the modem your computer the telephone circuit the remote modem the modem cable or the remote computer The modem can however help you isolate system troubles by performing a series of diagnostics tests It eliminates the time consuming guess work when communications failures or high error rates are encountered Preliminary Diagnostic Guide A communications problem can stem from the telephone company circuit the local or remote computer the cable the connectors or the local or remote modem Even if the communications path is in order the communications software parameters may be set incorrectly Experience has shown that modem problems often arise
52. modem will react to CTS RTS Clear To Send Request To Send signal It is in effect only in synchronous mode amp RO CTS tracks the condition of the RTS amp R1 RTS ignored and the CTS is forced on Data Set Ready DSR Option I amp S This command determines how the modem will operate the DSR Data Set Ready signal It is in effect only in synchronous mode amp SO DSR is forced on amp S 1 DSR operates in accordance with the EIA RS 232C specification Diagnostics Tests amp T This command instructs the modem to perform various diagnostics tests See the diagnostics tests chapter in this manual for details PCM 3600 User s Manual Read Configuration Profiles I amp V This command displays the SCP stored configuration profile the STN stored telephone number and the current modem operation states as follows amp VO Displays the ACA the SCP and the current modem operational status amp V1 Displays the STN Write Configuration Profile amp W1 This command writes the content in the active configuration area ACA to one of the stored profiles SCP Your modem may not provide all of the commands listed below Check your Getting Started manual to see which of the following commands your modem provides amp WO Writes ACP active configuration profile to SCPO amp W1l Writes ACP to the SCP1 amp W2 Writes ACP to the SCP2 amp W3 Writes ACP to the SCP3 amp W4 Writes ACP to the SCP4 Once a profile i
53. nd data buffer are deactivated The modem functions like an ordinary non MNP modem In reliable ECDC mode N2 both the error correction and data buffer are activated Use this mode if you want to originate an error correction connection with a remote ECDC modem In auto reliable mode N3 your modem may establish either a reliable link or a normal link depending on whether the remote modem supports MNP or not Use this mode for auto answering so that you can have a reliable link with any ECDC calling modem and have a normal link with any non ECDC modem as well In reliable V 42 mode N4 your modem may establish a reliable link if the remote modem supports V 42 Use this mode for auto answer ing so that you can have a reliable link with any V 42 calling modem Originate Reliable Link 0 Negotiation by remote to accept reliable link In this situation the remote shall isue the U command Serial Port Flow Control Option Q This command determines which flow control method the modem uses QO Disables serial port flow control Q1 Uses bi directional XON XOFF hardware flow control An XOFF stops transmission and an XON resumes it XON XOFF characters are generated by the modem with the same parity as it generates data characters The serial port also responds in the same way to the XON XOFF sent to it from the local computer Q2 Uses uni directional CTS flow control Data transmission from the local computer stops i
54. ng It sets the duration and spacing of tones during touch tone dialing The default is approximately 5 26 digits per second Escape Code Guard Time S12 Range 0 255 Unit 20 millisecond Default 50 The register S12 determines the guard time which is required before the first escape and after the last escape characters are entered This allows the modem o distinguish the escape command from transmis sion data Test Timer S181 Range 0 255 Unit Second Default 0 The register S18 determines how long a diagnostic test lasts before it is terminated The default is 0 meaning the test timer is disabled Delay to DTR S25 Range 0 255 Unit Second or 10 millisecond Default 5 In sync async mode register S25 determines how long the modem waits from the time it completes the connection sequence to the time it examines DTR status This delay allows the operator to disconnect the modem from the asynchronous data terminal to a synchronous data terminal without breaking the connection In this mode the unit of this register is in seconds and the default is 5 seconds In asynchronous and other synchronous modes a DTR change ON or OFF which lasts for less than the time defined by register S25 is ignored by the modem In these modes the unit of this register is 10 millisecond and the default is 0 05 seconds Chapter 6 Modem Registers 65 RTS to CTS Delay Interval S26 Range 0 255 Unit 10 millisecond Default 0 Register S26 deter
55. ng synchronous mode amp M2 Sets the modem to synchronous mode 2 the dial stored number synchronous mode amp M3 Sets the modem to synchronous mode 3 the manual dial synchronous mode amp M4 Sets the modem to asynchronous mode and to auto dial STNO when DTR goes on or when the voice data switch is toggled to data Note that command amp MO to amp M3 has the same function as the amp Q commands Pulse Dial Selection amp PI This command is used to determine some of the characters in relation to pulse dialing method It is in effect only when the modem uses pulse dialing amp PO Selects the make break ratio of 39 61 for use with modems in countries such as the U S A and Canada amp P1 Selects the ratio of 33 67 for use with modems in countries such as the United Kingdom or Hong Kong Nam 44 Asynchronous or Synchronous Selection amp Q This command has the same function as command amp M See the amp M command section for details Your modem may not provide all of the commands listed below Check your Getting Started manual to see which of the following commands your modem provides amp Q1l Sets the modem to synchronous mode 1 the asynchronous dialing synchronous mode amp Q2 Sets the modem to synchronous mode 2 the dial stored number synchronous mode amp Q3 Sets the modem to synchronous mode 3 the manual dial synchronous mode CTS to RTS Option amp R This command determines how the
56. p T8 In the LALST test the modem generates a test pattern to verify itself To initiate the test issue one of the following command lines AT S18 0 amp T8 Test timer disabled AT S18 30 amp T8 Set test timer to 30 seconds The test begins after the modem sends a carriage return and a line feed When the test is terminated the modem responds with the number of errors detected during the test A value of 000 means no errors while 255 means 255 or more errors Chapter 7 Diagnostic Tests 71 72 PCM 3600 User s Manual APPENDIX Modem Response Codes Modem Response Codes Code in Digit and Word Form Meanings of the Response Code 0 OK Command line executed successfully 1 CONNECT Connection at 300 bps or 1200 bps 2 RING Incoming ring detected 3 NO CARRIER Remote carrier lost or not detected 4 ERROR Command line error 5 CONNECT 1200 Connection at 1200bps 6 NO DIAL TONE Dial tone not detected 7 BUSY Busy signal detected 8 NO ANSWER 5 second silent not detected 10 CONNECT 2400 Connection at 2400bps 11 CONNECT 4800 Connection at 4800bps 12 CONNECT 9600 Connection at 9600bps 13 CONNECT 7200 Connection at 7200bps 14 CONNECT 19200 Connection at 19200bps 15 CONNECT 14400 Connection at 14400bps 16 CONNECT 38400 Connection at 38400bps 17 CONNECT 57600 Connection at 57600bps 18 CONNECT 12000 Connection at 12000bps 20 CONNECT 300 V42 Connection at 300bps in r
57. peed DCE Speed ursuersneesnersneenneennennen nenn 12 Serial Port Speed DTE Speed ursuersessnessnerneensennnen nn 13 Error Correction and Data Compression ECDC 14 Flow Controls an ETER 15 Non Volatile Memory NVRAM eneenseesnen 15 Factory Default Profile FDP eenee 16 Stored Configuration Profile SCP ee 16 Major Stored Configuration Profile Major SCP 16 Active Configuration Area ACA neenensennsnenn 16 Stored Telephone Numbers STN een 17 3 Modem Operation and Response Codes 19 Modem Operation and Response Codes ssscsssseseeee 20 Command State and Data State occ nennen 20 The Escape Sequence t uuanessesssessnessnersnnennennnennnnnnn ern enn 20 Issuing Commands sosna riisiin 21 Command Buffer cccccccccssssccececseensaecececesensnseeecesenees 21 Deleting Commands seseriai eeii e Eoi 22 Modem AT Response Codes ur2ursneesnesnsesnnensennen nennen 22 Modem ECDC Response Codes 22u2222022sesensnernnernnennn 26 4 Basic Modem Commands 31 BASIC MODEM COMMAND sscs0ssesossesnsssssssessnssesunee 32 Answer Command cccccccccsssssssececeeesesssaeceececeesssssceceeeeenes 32 Attention Code AT 222 Haar near 32 Repeat the Last Command A eenen 32 Bell or CCITT Standard B
58. r Option C ene 53 Flow Control in Normal link G ee 54 Serial Port Baud Rate Adjustment 54 Set Break Control K nn iaa 55 MNP Linkage Mode Selection L ee 55 ECDC Operation Mode Selection NN 0 55 Originate Reliable Link O esenn 56 Serial Port Flow Control Option Q e 56 Inactivity Timer Tn essenssnsnnn 57 Request Reliable Link U ennsne 57 MNP Response Code Option V neeesser 57 XON XOFF Pass Through X sneee 59 Set Auto Reliable Fallback Character PAn 59 Set Modem Port Maximum Baud Rate Bn 59 Data Compression PC nrnna 60 Delay Before Forced Hang Up Dn 0 60 Automatic Retrain E nen 60 6 Modem Registers nnn 61 MODEM REGISTERS csssscsssscssssccsscccsssssssescssescsssees 62 Reading or Changing a Register urseesssseseennennnen nn 62 Auto Answer Ring Number SO senen 62 Ring Count SU tects hacienda tien ens aes 62 Escape Character S2 1 st een 62 Carriage Return Character S3 uesenen 63 Line Feed Character S4 kiinni anann aa 63 Backspace
59. r modem During the test everything you have typed on the keyboard is echoed by the modem back to the computer screen To initial the LAL test issue AT amp T1 The test begins after the modem responds with a carriage return and a line feed Type a string on the keyboard such as Once upon a time there was a the string should appear correctly on the screen If an error is found the modem the computer or the path may be at fault Local Digital Loopback Test amp T3 The local digital loopback test LDL verifies both modem and the telephone circuit It is primarily used to permit a modem that is not Chapter 7 Diagnostic Tests 69 70 CCITT V 54 compatible to engage in aRDL test with your modem To begin the test issue command AT amp T3 when the modem is on line and in command state Your modem loops the data it has received back to the remote station so that the remote modem can perform an RDL test with your modem Grant or Deny RDL Request amp T4 amp T51 If you wish to condition your modem to accept a request from the remote modem for an RDL test issue AT amp T4 This is the default condition To prohibit your modem from complying with the request issue AT amp T5 Remote Digital Loopback Test amp T61 The RDL test verifies your computer and modem the telephone circuit and the remote modem To initiate the test issue AT amp T6 Note that the remote modem should be set to accept digital loopback request
60. r the remote computer if you consider the remote modem as a transparent device Your modem communicates with your computer the local computer through RS 232 serial port interface and communicates with the remote modem via telephone line If data comes to your modem faster than it goes out some data may be lost because your modem can not pass on all the received data to the other end To overcome this problem your modem is equipped with a data buffer to store excess data received Once the buffer is full your modem must signal the sending device to stop transmission When the buffer is clear your modem signals to resume data trans mission This is called flow control Two kinds of flow control methods are commonly used the hardware flow control and the software flow control Hardware flow control is also called RTS CTS control as it uses the RS 232 hardware signals RTS and CTS to stop or resume data transmission This is the best method of flow control because you can send any data characters using this method The software flow control uses two data characters XON and XOFF to indicate when the sending device shall stop or resume Since it uses data characters as control you can not send binary data or file transfer protocols such as XMODEM with this type of flow control To select a method for flow control use command Q You should use hardware flow control at all times if your modem supports it Non Volatile Memory NVRAM
61. s mainly used in the U S and Canada B2 Selects V 23 Back channel user side B3 Selects V 23 Main Channel host side Transmit Carrier Control C CO Disable Transmit Carrier Cl Enable Transmit Carrier Dial in Originate Mode ID Command D instructs the modem to dial the number following it and enter the data state after a connection is established The number following command D may include the digits 0 9 the symbols and and dial modifiers P T R W S n and others Command Character Echo IE This command is used to enable or disable the echo of the command characters back to the computer It is only effective in command mode EO Disable the echo of command characters It is used when the command characters appear double on your screen or when you use a modem with a host computer and you want the command characters to be echoed El Enables the modem to echo command characters to your computer so that you can view and verify the command line on the screen Nam Hook Control Hl This command instructs the modem to go off hook use the telephone line or to go on hook hang up HO Hl Modem goes on hook Modem goes off hook identifications Il This command allows the checking of the modem s product code firmware version and executes firmware test as follows 10 Il I2 Displays the modem s product code Displays the checksum code of the modem s firmware ROM in ASCII digits fo
62. s or V 42 modes the identifier V 42 means error correction is enabled while V 42bis denotes both error correction and data compression are enabled 20 CONNECT 300 V42 REL Connection has been successfully established at 300 bps in reliable mode with or without data compression 21 CONNECT 600 V 42 REL Connection has been successfully established at 600 bps in reliable mode with or without data compression 22 CONNECT 1200 V42 REL Connection has been successfully established at 1200 bps in reliable mode with or without data compression 23 CONNECT 2400 V42 REL Connection has been successfully established at 2400 bps in reliable mode with or without data compression 24 CONNECT 4800 V42 REL Connection has been successfully established at 4800 bps in reliable mode with or without data compression 25 CONNECT 9600 V42 REL Connection has been successfully established at 9600 bps in reliable mode with or without data compression 26 PCM 3600 User s Manual 26 27 28 29 2A 30 31 32 33 34 35 CONNECT 19200 V42 REL Connection has been successfully established at 19200 bps in reliable mode with or without data compression CONNECT 7200 V42 REL Connection has been successfully established at 7200 bps in reliable mode with or without data compression CONNECT 14400 V42 REL Connection has been successfully established at 14400 bps in reliable mode with or without data compression CONN
63. s saved you can enable it by issuing the proper amp Y command 46 Select Store Profile amp Y This command assigns a stored configuration profile SCP as the major SCP which will be used to initial the modem when the modem is turned on or it is reset Your modem may not provide all of the commands listed below Check your Getting Started manual to see which of the following commands your modem provides amp YO Set SCPO as the major SCP amp Y1 Set SCP1 as the major SCP amp Y2 Set SCPl as the major SCP amp Y3 Set SCP1 as the major SCP amp Y4 Set SCPl as the major SCP Store Telephone Number amp Zn 1 Range n 0 to 9 This command stores digits as a stored telephone number STN which can be used when the dialing modifiers S n is issued AT amp Z0 9 13 0792 Stores9 13 0792 as STNO AT amp Z1 02 913 0774 Stores 02 913 0774 as STN1 Each STN is capable of containing up to 49 digits Spaces are ignored and will not be stored Wait for Silent Answer This command instructs the modem to wait for the time specified in register S7 followed by 5 seconds of continuous silence before it proceeds dialing the following digits The modem disconnects and responds with NO ANSWER if it fails to detect continuous silence or it responds with BUSY if it detects a busy tone PCM 3600 User s Manual Pausel Comma A command instructs the modem to wait for the time interval speci fied in register S8 before it proceed
64. s the modem to pulse dial 9 wait for two seconds for the comma character then tone dial 913 0792 Word or Digital Response Codes IV This command instructs the modem to send response codes in either word form or digit form as follows vo Send response codes in digital form This form is convenient when using the modem with software that does not handle character strings efficiently Vi Send response codes in word form such as OK or CONNECT This form is easier for the user to read Response Set Selection Xn Range 0to4 Default 4 This command determines which response code shall be enabled or disabled See the section of response code for more information Long Space Disconnect IY This command enables or disables the long space disconnect feature of the modem YO Disables long space disconnect Y1 Enables long space disconnect The modem will hang up when it receives a 1 6 seconds continuous break signal Also it will send a 4 second break signal before disconnecting when it receives command ATH or when it detects a DTR ON to OFF transition if amp D2 option is selected Reset Z This command resets the modem with factory defaults FDP and a stored configuration profile SCP It also performs a modem self test Some modems have additional SCPs for which you should refer to your Getting Started manual Z1 Reset the modem with SCP1 Z2 Reset the modem with SCP2 Auto dial at Power On amp An An R
65. s with the following commands on the command line This is useful when the modem is connected to a PBX system In such case dialing when connecting the modem to an outside line takes a while The duration of the pause is default at 2 seconds and can be changed by assigning a new value to register S8 You may even use multiple commas in sequence to get a longer pause time Dial the Stored Number n This dial modifier is an alternative to the dial modifier S n Issue n after the dial command D instructs the modem to dial the stored telephone number STN previously saved with the amp Z command For example AT amp Z0 9 13 0792 Save 913 0792 to STNO ATDT O Dial the stored number STNO ATDT886 2 0 Dial 886 2 913 0792 8862 plus STNO ATDT 2NS 5 Dial STN2 If busy swap dial STNS Remember that the modem command buffer counts n as 2 characters though you may store up to 49 digits 48 Escape Characters I 1 The escape character instructs the modem to leave from data state and to enter to command state without breaking the connection This is effective only in the asynchronous mode In order to let the modem distinguish the escape characters from data the escape character must be issued with a guard time period before and after This is called the escape sequence To enter the escape sequence while the modem is on line in data state 1 Wait for one second of guard time without typing or transferring anything 2 Ent
66. t to send response codes by issuing command Q1 it will always send a response code after executing a command line The response code can be displayed in word or in digit form depending on the V command issued Command X0 to X4 lets you select different response sets of the modem which enables or disables certain response codes In general application you can select X4 the default which enables all response codes so that the most specific response message can be displayed If you plan to write your own software for special applications you may select the response set you require by issuing an appropriate X command The following table shows the response codes from 0 to 8 related to each command The means the response code is disabled for the corresponding command The remaining response codes are enabled 22 PCM 3600 User s Manual by key command x1 x2 x3 x4 but disabled by key command x0 Commandstoenabtethe Response Code response code 0 OK x0 xl x2 x3 x4 1 CONNECT x0 xl x2 x3 x4 2 RING x0 xl x2 x3 x4 3 NO CARRIER x0 xl x2 x3 x4 4 ERROR x0 xl x2 x3 x4 5 CONNECT 1200 xl x2 x3 x4 6 NO DIAL TONE x2 x4 7 BUSY x3 x4 8 NO ANSWER x2 x3 x4 Selected response codes are listed below Each number on the left is the digit equivalent short form of the response code 0 OK The command line stored in the command buffer has been executed without error 1 CONNECT Modem has successfully established a connect
67. ta communications throughout the world the Bell standard and the CCITT recommendation For 1200 bps protocols the Bell standard is used mainly in the United States and Canada while the CCITT standard is used in most other countries For 2400 bps and faster protocols the CCITT standards are used internationally The follow ing table shows common communications protocols listed from the highest to the lowest DCE speed DCE Speed Bell CCITT Synchronous 28800bps N A V 34 async sync 14400 bps N A V 32bis TCM async sync 9600 bps N A V 32 QAM amp TCM asyne sync 2400 bps N A V 22bis async sync 1200 75 bps N A V 23 Main host async 75 1200 bps N A V 23 Back user async 1200 bps 212A V 22 async sync 0 300 bps 103 V 21 async Chapter 2 Modem Fundamentals 11 Data communications requires that both modems on a link use the same protocol The protocol determines the communications speed and transmission standard Bell or CCITT To change protocols you can issue a B command and the modem automatically goes to the highest speed of that protocol If you want to specify a particular protocol speed issue a B command Speeds of the Modem During an on line communications path your modem is located between the local computer and remote modem It has to communi cate with both the remote modem and local computer through the telephone line and serial port cable respectively Figure 1 1 describes the DCE speed relationship between modems
68. the original SCP and becomes the new SCP For information on the SCPs of your particular modem refer to your Getting Started manual Major Stored Configuration Profile Major SCP The major SCP is the SCP that is loaded into the ACA each time the modem is turned on or reset by ATZ To designate an SCP as the major SCP issue amp Y followed by the SCP number For example issuing amp Y1 designates SCP1 as the major SCP Active Configuration Area ACA The ACA is a portion of the random access memory RAM in your 4 A modem that holds the configuration settings that determine the modem s current operating characteristics When the modem is turned on or reset by command ATZ the ACA is first loaded with the FDP and then is overwritten by the major SCP The commands you issue to the modem actually change the contents of the ACA However once the modem is turned off all the settings in the ACA vanish To save the current ACA configuration to a SCP for further use issue command amp W followed with the number of the SCP For example issue amp W1 saves the current configuration to SCP1 The next time you want to use the same configuration just issue AT amp 1 to load the ACA with the SCP1 previously saved Issuing amp VO command displays the current configuration profile the stored configuration profiles as well as the current speed data format parity and protocol Stored Telephone Numbers STN The STN are the dig
69. way of describing this modulation demodulation process In addition to converting data to sound a modem performs functions such as dialing answering calls and adjusting settings for local telephone conditions Commands must be issued to the modem to control these functions and settings Data Format In asynchronous serial communications data bytes are disassembled into individual bits and then transmitted bit by bit along with interval bits and checksum bits in the order of start bit data bits parity stop bits and so on The interval bits start bit and stop bit signal to the receiving party the beginning and end of a byte The checksum bit and parity allow the receiving party to check the accuracy of the received data The pattern in which a byte is disassembled is called the data format Modems at both ends of a link should use the same data format Otherwise the data may be misinterpreted and appear garbled The most commonly used data formats include the following types Before you dial a bulletin board or connect on line with any remote modem make sure your modem supports the required data format your software can specify the required data format and that you have specified the correct data format 4 f Start Bit Data Bits Parity Stop Bit Total 1 8 none 1 10 1 7 none 2 10 1 7 even odd 1 10 1 7 mark space 1 10 Communications Protocols Two popular groups of communications protocol are currently used in da

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