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2842R

1. d The 2 Wire Leased Line Connect the 2 wire leased line to the positions marked TXA and TXB It should be used in conjunction with the DIP switches to set the line type of the modem otherwise it might fail to make connections The SG position is used to connect the signal ground to other equipments the FG position is used to connect the framing ground of the power source 4 Connect the modem to the computer Your modem provides a 25 pin RS 232C serial port connector which is used to connect the modem to any of the serial ports on your computer or terminal Please make sure that the computer or terminal has been turned off before you connect the modem with it 5 Connect the modem to the power adapter and the power source Make sure the power switch of the modem is in OFF position and plug the power adapter to the power socket of your modem Plug the other end of the power cable into the power source Installation Check Turn the power switch to ON position Check the modeny s front panel to determine its current operating state If there is no problem with the 2 14 installation the modem will automatically enter the command state when you turn on the power Another way to check if your modem has been properly installed is to use a proper communication software to input the following commands from your computer or terminal to the modem lt Enter gt ATZ lt Enter gt If your modem is functioning properly 1t
2. Selects LAP M error correction mode Failure to make a LAP M error correction results in the modem hanging up Forces amp Q5 and S48 0 Note TheAT K1 command can override the ATIN4 command Selects MNP error correction mode Failure to make an error correction connection results in the modem Forces amp Q5 S36 4 and S48 128 AT Rn Serial Port Ring Indicator Control AT RO telephone AT RI Keeps the ring indicator ON for the duration of the call Default Turns OFF the ring indicator after the telephone call is 4 21 answered This command controls the RS 232C pin No 22 ITU T V 24 No 125 signal Calling Indicator You can set this pin to always ON or ON untill answered during the telephone call AMS Modem Status Display This command displays the active command setting and lists the command The following is an example of the screen display when the AT S command is issued AT MS Report 11 1 2400 28800 Protocol 11 V 34 Mode 1 Auto with V 8 Min Speed 2400 Max Speed 28800 DTE SPEED 115200 bps DATA BITS 8 PARITY NONE STOP BIT 1 DCE SPEED Idle LINK LAYER PROTOCOL Idle COMPRESSION Idle LAST DIAL NUMBER T 886 2 999 5155 CMD DESCRIPTION OPTION CMD DESCRIPTION OPTION Bl BELL OR TU Bell EI COMMAND ECHO On LI SPK VOLUME Low MI SPKMODE ee Mode 1 Press ESC to stop or press ANY KEY to continue CMD DESCRIPTION OPTION CMD
3. modifier in the ATD command amp Same definition as modifier in the ATD command Same definition as modifier in the ATD command CRSm Dialing Stored Number Command Dials the telephone number that previously stored in memory location m The range of m is between 0 to 5 You can store these telephone numbers using AT amp Z command please refer to Chapter 4 in AT command mode or using PRN command below PRN m n Store Telephone Number in Location m This command stores telephone number in memory location m for later dialing It is identical with the AT amp Z command in AT command mode The range of m is between 0 to 5 The n is a dial string of up to 23 characters Valid dial string characters are O to 9 dial modifiers and for tone dialing RLN Display the Stored Telephone Number This command shows the six location O to 5 stored telephone numbers You can use this command to verify the number that you stored DIC Disregard Incoming Call The DIC command disables the auto answer function of the modem in ITU T V 25bis operation mode CIC Connect Incoming Call 6 2 This command enables the auto answer function of the modem CNL Execute AT Command This command allows the user to issue and execute the AT command while in the V 25bis command mode ITU T V 25bis Result Code The result code shows the result of the command been executed Detail descriptions of the result codes are showed below
4. 0 4 5 9 12 13 14 10 0 15 dB 10 0 15 dB 0 10 0 31 dB 58 60 0 255 Minute 60 1 255 Second Table 5 1 Modem S registers 52 Register Description SO Number of Rings to Auto Answer Sets the number of rings required before the modem automatically answers a call Setting this register to zero disables the auto answer function Range 0 255 rings Default 1 S1 Ring Counter SI is incremented each time the modem detects a ring signal on the telephone line S1 is cleared if no rings occur over an eight seconds interval Range 0 255 rings Default 0 S2 Escape Character S2 holds the decimal value of the ASCII character used as the escape character The default value corresponds to an ASCII A value over 127 disables the escape process 1 e no escape character will be recognized Range 0 127 ASCII decimal Default 43 S3 Carriage Return Character Sets the command line and result code terminator character Pertains to asynchronous operation only Range 0 127 ASCII decimal Default 13 Carriage Return S4 Line Feed Character 5 3 Sets the character recognized as a line feed Pertains to asynchronous operation only The Line Feed control character is output after the Carriage Return control character 1f verbose result codes are used Range 0 127 ASCII decimal Default 10 Line Feed S5 Backspace Character Sets the character recognized as a backspace Pertains to asynchronous oper
5. 2 Enables extended services K2 Power Level Adjustment for cellular use Mn 0 Auto adjustment MO Default 1 Force adjustment MI Break handling Kn 0 NKO selected 1 K selected 2 K2 selected 3 K3 selected 4 K4 selected 5 KS selected Default MNP block size An 0 64 bytes AO 1 128 bytes A1 Default 2 192 bytes A2 3 256 bytes A3 Bit Mapped Options Status Indicates the status of command options Default Bits 0 1 Bits 2 6 Bit 3 Bit 4 Bit 5 Bit 7 Compression protocol selection Cn 0 Disabled C0 1 MNP5 C1 2 V 42 bis C2 3 MNP 5 and V 42 bis C3 Default Auto retrain and fallback fall forward En 0 Retrain and fallback fall forward disabled E0 1 Retrain enabled E1 2 Return and fallback fall forward enabled E2 Modem to modem flow control Gn 0 Disabled GO Default 1 Enabled G1 Block mode control Ln 0 Stream mode LO Default 1 Block mode L1 Reserved Enable fallback to V 22bis V 22 Qn 0 Disabled Q0 1 Enabled Q1 Default S46 Data Compression Selection This register controls whether the data compression takes effect or not 5 15 S46 136 Using error correction without data compression S46 138 Using error correction with data compression Default 138 S48 V 42 Negotiation Action The V 42 negotiation process determines the capabilities of th
6. ATO1 Enters on line data mode with a retrain before returning to on line data mode ATQn Result Code Command ATQO0 Sends result codes to the local system Default ATQI Prohibits the modem from sending result codes to the local system Some of the central site computers do not recognize the result code of the modem please use the ATQ1 command to disable the result code of the modem ATSr n Change The Content of S Register ATSr n r indicates the number of S register n indicates the content of S register 48 ATSr Select S register AT Read pre selected S register AT n Change the content of pre selected S register to n This command can change the content of S register The content n should be in decimal form ATSr Read the content of S register r This command causes the modem to return a 3 digits decimal number indicates the content of the specified S register The r indicates the number of the S register ATVn Result Code Type ATVO Selects short digit form result codes ATVI Selects long verbose form result codes Default The command result code is reported in two ways The first is the long form is reported in verbose type result code This is easy to read for user The second is the short form is reported in numeric digit form This is usefull for the software programmer to identify during program application The result code is also devided into standard and extended result codes The sta
7. control and set the modem to 4 Wire or 2 Wire leased line operation and activate the dial back up function Dial Back up Operation If the leased line quality is not good enough to maintain data transmitting the modem will retrain and if retrain fails the modem will lose carrier The originate modem will automatically dial the stored telephone number 7 1 in NVRAM from 0 to 5 If the time interval that specified by register S212 cannot connect Default 60 seconds the modem will go back to leased line and try again to connect and so on until the modem connect successfully If the dial up line connect successfully the modem will begin to transmit data If the time interval of the register S211 is achieved Default 60 minutes the modem will automatically stop transmitting and change the dial up line to leased line and try to connect The dial line will be hold If the leased line connect successfully the dial back up sequence will be ended and the dial up line will be hanged up If the connection is failed after the time interval that specified by the register S212 the modem will go back to dial up line and await the next time interval that specified by the register S211 to achieve If you want the modem to manually restore to the leased line please use the front panel switch V D to hang up the dial up line during dial back up mode and entering restore sequence 7 2 CHAPTER 8 SPECIAL FUNCTIONS The modem includes four sp
8. RESULT CODE DESCRIPTION VAL Command valid and executed successfully INV Command error can not be executed CNX m Modem connect to the remote modem The m indicate the DCE speed INC Ring signal detected CFI m Failure of dialing the m represents the meanings below ET Line busy RT No answer CB Local modem busy NT No carrier NS Memory location is empty no telephone number stored AB Receive interrupt while dialing LSN m n Display the stored telephone numbers m indicates the memory location of the telephone number n indicates the telephone number HDLC Sync Operation of ITU T V 25bis Use the DIP switch 3 8 to ON to configure your modem to operate at V 25bis mode Turn the power switch OFF and then ON again to let the modem to read the DIP switches and configure itself to ITU T V 25bis command mode To use the HDLC command and indications are the 6 3 same as the V 25bis command above You have to use the format of HDLC High level Data Link Control ar Flag Address Control Message FCS Flag Sei Flag Opening Closing flag 01111110 7EH Address Address Field 11111111 FFH Control Control Field 00000011 03H or 00010011 13H Message Command to or Response from modem FCS Frame check Sequence The message is 8 bit ASCII code The modem will ignore the par
9. call progress frequency band before continuing with the next dial string parameter If the modem does not detect these 5 seconds of silence before the expiration of the call abort timer S register 7 the modem will terminate the call attempt with a NO ANSWER message If busy detection is enabled the modem may terminate the call with the BUSY 4 5 result code If answer tone arrives during execution of this parameter the modem handshakes amp Wait for AT amp T bong tone for credit card dialing before continuing with the dial string If bong is not detected within the time specified by S register 7 the modem will abort the rest of the sequence return on hook and generate an error message Dial pause The modem will pause for a time specified by S register 8 before dialing the digits following Return to command state Added to the end of a dial string this causes the modem to return to the command state after it processes the portion of the dial string preceding the This allows the user to issue additional AT commands may be placed in the original command line following ne and or may be entered on subsequent command lines The modem will enter call progress only after an additional dial command is issued without the terminator Use ATHO to abort the dial in progress and go back on hook di Enable calling tone Applicable to current dial attempt only ATEn Echo Command The modem enab
10. compromise equalizer This command can be used when the modem is attached to either a flat line or a cellular connection AT EO Disables the equalizer AT El Enables the equalizer Default 4 29 Introduction CHAPTER 5 REGISTERS This chapter describes each register and explains how to change its value Some registers control a single function while others control several functions and are bit mapped Bit mapped registers are recommended for reading modem status only Commands to Change or Read Registers ATSn AT AT ATSn ATSn Changes the value of a register n number of register 777 new value of register in decimal Changes the value of the last referenced register new value Displays the value of the last referenced register Points to new register 9999 n number of register to point Displays the contents of the register selected with n 19 99 n number of register to point The modem uses registers to store configuration status Some of the registers control only one function but some of them are called bit mapped registers which control several functions in single register Table 5 1 summarizes the functions of each register used by the modem Register Function Description Default Range Units SO Rings to Auto Answer 1 0 255 Rings SI Ring Counter 0 0 255 Rings S2 Escape Character 43 0 127 ASCII 51 S3 S4 S5 S6 S7 S8 S9 S10 S11 S12 S14 S16
11. control extra functions An alphabetical listing of commands is listed below Command Syntax The command must be preceded by AT ATtention code except A and escape commands AT can be entered as upper or lower case characters and can NOT be deleted by backspace or delete keys The attention code is used by the modem to determine the speed and data format of the incoming data from DTE More than one command can be entered in one command line and may be separated by space for readability The command line can NOT exceed 40 characters excluding the attention code and must be ended by the ASCII character specified by S register 3 The default of the S register 3 is the decimal 13 Carriage Return A line without carriage return will be ignored Commands following the AT are processed after receiving the Carriage Return character and the space added for readability will be ignored Any parameters following the AT command that were ignored will be treated as equal to 0 AT Command Summary ATA Manual Eeer ii 4 4 A Repeat Last Commande 4 4 ATBn Select ITU T BELL Mod Sissi 4 4 ATDn ee ee 4 4 ATEn Echo O e namie 4 6 ATHn Hang Up The Telephone Lime arianna 4 6 4 1 ATIn ATLn ATMn ATNn ATOn ATP ATQn ATSr n ATT ATVn ATWn ATXn ATYn ATZn AT amp Cn AT amp Dn AT amp Fn AT amp Gn AT amp Kn AT amp Ln AT amp Mn AT amp Qn AT amp Rn AT amp Sn AT amp Tn AT amp Un AT amp V AT amp Wn AT amp Xn AT
12. desired mode and finally set the DIP switch 4 1 to ON position to let the modem read DIP switch while power on or upon reception of ATZ command The above setting can also be set via AT command and S registers and save it using the AT amp W command 2 Set the DIP switch 3 8 to ON to configure your modem to operate at ITU T V 25bis command mode 3 Turn the power switch OFF and then ON again to let the modem to read the DIP switches and configure itself to ITU T V 25bis command mode The modem is now ready to operate at ITU T V 25bis command mode The AT command is no longer valid all the actions that you want the modem to perform has to issue by V 25bis command ITU T V 25bis Command Set The V 25bis command set provides you to do dialing storage dialing storage of telephone number auto answer manual answer etc The command can be entered in either upper or lower cases Detail descriptions about the command set are listed below 6 1 CRN n Dialing Command This command dials a telephone number specified by the parameter n The n in this command is a dial string which includes telephone number 0 to 9 and for tone dialing only dial modifiers please refer to Chapter 4 ATD command Any dial modifier specified in ATD command is valid here in ITU T V 25bis command mode There are four extra dial modifiers that V 25bis defined listed below Same definition as W modifier in the ATD command lt Same definition as
13. number which specifies the lowest rate at which the modem may establish a connection The value is decimal coded in units of bps e g 2400 bps The default is 300 for 300 bps 4 lt max_rate gt is an optional number which specifies the highest rate at which the modem may establish a connection The value is decimal coded in units of bps e g 14400 bps specifies the highest rate to be 14400 bps The default is 28800 for 28800 bps REMARK 14400bps Function The 14400bps modem do not support the AT MS command To change the protocol and connect mode please use the ATS37 m and ATNn command MNP 10 COMMAND SET 4 27 AT Mn Power Level Adjust Command Enables or disables adjustment of the transmit power level to accommodate the signalling requirements of cellular telephone equipment AT MO Disables power level adjustment during MNP 10 link negotiation The AT MO command will allow the transmitter adjustment if cellular operation is requested by the remote modem Default AT MI Enables power level adjustment during MNP 10 link negotiation NOTE AT MI should not be used with AT H2 AT Hn Link Negotiation Speed This command controls the connection speed for link negotiations before upshift occurs between two MNP 10 modems AT HO Link negotiation occurs at the highest supported speed Default AT H1 Link negotiation occurs at 1200bps used primarily for establishing cellular connections AT H2 Link negotiation occu
14. remote modem break is passed to the DTE as follows In direct mode the break length is passed in normal mode and in error correction mode a 300 ms break is passed AT F View Stored Telephone Number 4 19 This command shows the content of the four stored telephone numbers AT Gn Modem Port Flow Control AT GO AT G1 Disables modem port flow control Default Enables modem port flow control If enables the modem port flow control the modem will use the XON XOFF characters to do the flow control This command only valids when the modem is in normal mode has no effect during error correction or direct mode connection AT Kn Break Control Controls the response of the modem to a break received from the DTE or the remote modem or the B command according to the parameter supplied The default of this command is AT K5 The response is different in three separate states describe below Break received from Bn command DTE while in connect state during on line mode Enter on line command mode no break sent to the remote modem Same as 0 Immediately send break to remote modem K1 Clear data buffers and send break to remote modem received from DTE while in on line command state Purge buffers immediately send break to remote modem Purge buffers immediately send break to remote modem Immediately send break to remote modem Immediately send break to remote modem Break received from
15. the modem will go on hook when it encounters the Flash dial modifier in the dial string Range 0 255 10 mS interval Default 70 S30 Inactivity Disconnect Timer This register monitors the activity on the line It specifies the time that the modem waits before hanging up while no data is received or sent The timer is disabled when set to 0 511 Range 0 255 10 seconds Default 0 Disabled S31 Bit Mapped Options Status Indicates the status of command options For 2842 RM modem Bit 0 Reserved Bits 1 0 Fix mode NO 1 Multi mode N1 Default Bits 2 3 0 WO Default 1 WI 2 W2 Bits 4 0 N3 off 1 N3 on Bits 5 7 Reserved For 1442 RM modem Bit 0 0 N3 off 1 N3 on Bits 1 0 Fix mode NO 1 Multi mode N1 Default Bits 2 3 0 WO Default 1 WI 2 W2 Bits 4 0 N2 off 1 N2 on Bits 5 7 Reserved S32 Xon Character Sets the value of the XON character for software flow control Range 0 255 ASCII decimal Default 17 CTL Q S33 Xorr Character Sets the value of the XOFF character for software flow control Range 0 255 ASCII decimal Default 19 CTL S 5 12 S36 LAP M Failure Control This value indicates what should happen upon a LAP M failure These fallback options are initiated immediately upon connection if S48 128 If an invalid number is entered the number is accepted into the register but S36 will act as 1f the default value has been entered S
16. the password and telephone number 1 Enter password and call back telephone number and then activate call back security function at the answer modem 2 The user dial for connection the answer modem will ask to enter password The terminal of the originate modem shows ENTER PASSWORD After the originate user keyin the correct password the answer modem will hang up and call the corresponding telephone number The terminal of the answer modem shows CHECK OK and CALL BACK IN PROGRESS 3 If you enter wrong password The answer modem will ask password for two more times Each entry has a time limit of 20 seconds The modem will hang up automatically when the third wrong password has entered This function can be simplified for only password protection To acomplish this function enter the password follows the colon sign and then lt CR gt using AT S command After entering the password the answer modem will check for password only and will NOT hang up and call back anymore AT Commands for Call Back Security AT E Set Call Back Security This command controls the ON OFF of call back security Only the answer modem is needed to activate the call back security O EOU E Call back security disabled El Call back security enabled default X X Remark Please enter at least one set of the password before 8 2 activating the call back security function to ensure the modem answers correctly A
17. will respond with the message OK However if this message fails to appear trun off your modem and computer or terminal and check all the steps detailed in section Installing Your Modem When you are certain that the modem is correctly installed repeat the procedure listed above If the modem still do NOT response please contact your dealer 2 15 CHAPTER 3 MORE ABOUT THE MODEM This chapter describes a few concept about the modem the user should read this chapter carefully to avoid miss understanding or confusing about the modem s function The Modem Mode The modem has three basic modes the command mode data mode and escape mode In the command mode you can enter command to the modem to set registers parameters and carry out a variety of dialing and control functions Details about commands are given in Chapter 4 In the data mode you can transmit and receive data over the telephone line to another remote modem The data mode can be further subdivided into three modes The first is the originate mode under which the modem originates a call the second is the answer mode under which the modem answers the incoming call The third is the self diagnostic mode under which the transmitted data is looped back through the modem allowing evaluation of the modem s performance and line condition When the modem is in data mode if you issue the escape character defined in S register 2 three times with the guard time defined
18. 00 selects V 32 9600 or 4800 bps c To emulate issuance of the ATNOS37 x command sequence to select fixed mode operation specify the lt max_rate gt and lt min_rate gt both to be the same requested speed and lt mod gt to be the modulation for that speed For example AT MS 11 0 16800 16800 selects V 34 16800 bps fixed mode no comparable S register 37 value AT MS 9 0 12000 12000 selects V 32bis 12000 bps fixed mode same as ATNOS37 10 4 26 For lt automode gt automode enabled i e automatically select speed and modulation The modem connects at the highest possible rate in accordance with V 8 or multi mode if V 8 is not supported by the remote modem a If lt max rate gt is greater than the highest rate supported by the modulation specified by lt mod gt the modem auotmodes down from the highest rate of the selected modulation For example AT MS 10 1 1200 24000 selects automoding down from V 32bis 14400 bps b To emulate issuance of the ATN1S37 x sequence command specify the modulation and the rate to start automoding down from using lt mod gt and lt max_rate gt respectively Set lt min_rate gt to 300 to allow automoding all the way down to V 21 300 bps For example AT MS 11 1 300 16800 selects automode starting at V 34 16800 bps no comparable S register 37 value AT MS 9 1 300 12000 selects automode starting at V 32bis 12000 bps same as ATN1S37 10 3 lt min_rate gt is an optional
19. 10 S006 WAIT DIAL TONE 002 S008 PAUSE TIME Li 002 S010 CARRIER LOS DISC 014 S012 ESC GUARD TIMER 050 S020 AUTOSYNC CHAR 000 S025 DELAY TO DTR OFF 005 S029 FLASH DIAL TIMER 070 S032 XON CHAR s2 52 20 ani 017 S037 LINE CONNECT SPD 000 S046 COMPRESS CONTROL 138 5082 BREAK CONTROL 128 S091 PSTN XMIT LEVEL 010 5099 LL XMIT LEVEL ee 010 OK LO MO KO M26 CMD MNP BLOCK XFER Mode 0 MNP10 PWR ADJUST ue Off KEY INTERRUPT oe On MNP10 XMIT LEVEL 26 dbm DESCRIPTION OPTION COMPROM EQULIZER On RING COUNTER lee 000 lt CR gt CHAR o Li 013 lt BS gt CHAR ean sna 008 WAIT CARRIER Lu 050 CARRIER RESPONSE 006 DTMF DURATION 095 TEST TIMER ansia 000 SLEEP INACT lia ea 000 RTS TO CTS DELAY 001 CONNECT INACT Lu 000 XOFF CHAR anre a lei 019 HANGUP DELAY Ln 020 V42 NEGO CONTROL 007 CALL FAILURE COD 000 FAX XMIT LEVEL Lu 010 AT Kn Keyboard Interrupt Command AT KO Enables keyboard interrupt during handshake Default AT K1 Disables keyboard interrupt d
20. 36 0 Modem disconnects S36 1 Modem stays on line and a Direct mode connection is established S36 2 Reserved S36 3 Modem stays on line and a Normal mode connection is established S36 4 An MNP connection is attempted and if it fails the modem disconnects S36 5 An MNP connection is attempted and if it fails a Direct mode connection is established S36 6 Reserved S36 7 An MNP connection is attempted and if it fails a Normal mode connection is established Default 7 S37 Desired Line Connection Speed Desired line connection speed If an invalid number is entered the number is accepted into the register but S register 37 will act as 1f the default value has been entered S37 0 Attempts auto mode connection S37 1 3 Attempts to connect at 300 bps 53724 Reserved 93725 Attempts to connect at V 22 1200 bps S37 26 Attempts to connect at V 22 bis 2400 bps S37 7 Attempts to connect at V 23 75 1200 bps S37 8 Attempts to connect at V 32 bis V 32 4800 bps 937 9 Attempts to connect at V 32 bis V 32 9600 bps 5937210 Attempts to connect at V 32 bis 12000 bps 937211 Attempts to connect at V 32 bis 14400 bps 5937212 Attempts to connect at V 32 bis 7200 bps Default 0 S38 Delay before Forced Hang up 5 13 This register specifies the delay between the modem s receipt of the ATHO command to disconnect or ON to OFF transition of DTR if the modem is programmed to follow the signal and the disconnect operation Applic
21. 45 Jack Terminal Block There are two versions for the rack mounted type modem The RJ 45 phone jack or terminal block are used for connecting the telephone line and handset If you are using the RJ 45 phone jack type please refer to the RJ 45 Connector in Standalone Modem Rear Panel above for the wiring information If you are using the terminal block type the detail wiring information are descibed below the same as Figure 2 4 LA and LB Telephone Line Terminals These two terminals are for the user to connect to the public telephone line PA and PB Phone Set Terminals These two terminals are for the user to connect to the telephone set TXA and TXB Transmit Line Terminals These two terminals are the transmit line when in 4 wire leased line mode They also are the full duplex transmit and receive line when in 2 wire leased line mode RXA and RXB Receive Line Terminals These two terminals are the receiving line when in 4 wire leased line mode The DIP Switches There are 5 DIP switches on the modem P C Board you have to remove the modem P C Board from the casing standalone case or rack mounted 2 9 shelf to see or adjust these DIP switches On power up or reception of the ATZ command the modem will scan the DIP switches and configure itself to meet the setting If any AT command issued changes the setting after power up or ATZ it will change the setting of the modem The function of these DIP switches is described
22. Atrie 2842RM MODEM User s Manual Atrie 2842RM MODEM USER S MANUAL TABLE OF CONTENTS CHAPTER 1 INTRODUCTION CVV ST VLE Wir ae TL a aden e did 1 1 Remarks varsle 1 1 2842 Modem Features reseenenneneenenneneunennenerneneenerneneuneenenenenenenenenenenenenvnvnene 1 2 CHAPTER 2 INSTALLATION Package Contesta ASA RIE 2 1 Modem Panel Desc i k ea Se ee 2 1 The DIP Witches ol i i oh ri 2 9 Modem Installation tia 2 13 The Modem Mode siii ani i bill 3 1 The Modem Port and Serial POTt 3 1 Flow Control ege AAA hn a A ia 3 3 The Modem Operating Modest dd o e 3 5 The ITUST V42 V 42bIS I EE O 3 6 Th GI Fax D ele Te ee ee aicns ku hh Licio da 3 8 The Voice Functio insae bss 3 8 brodd mme ZOS EGY a atte ca Sac ae nase unas RIA RICREA LOCRI 4 Command Syntax raid dass gioia al s dd dida dada 4 1 AT Command Summary iaa ias 4 1 AT Command ERE rat 4 4 MNPIG Command Setti robia ln 4 27 CHAPTER 5 REGISTERS A nesen 5 1 Commands to Change or Read Regist r iconica ballando degna 5 1 Register Description ia sillin dildo 5 3 CHAPTER 6 ITU T V 25BIS OPERATION Contigurationsol ITU T Nee il ia 6 1 HDLC Sync Operation of ITU T V 2 DIS z pl Nee Susane 6 3 CHAPTER 7 DIAL BACK UP OPERATION PEPA AA r 7 1 Dial Back up Opsvik 7 1 CHAPTER 8 SPECIAL FUNCTIONS Connection see as 8 1 Call Bak SN sr 8 1 CHAPTER 1 INTRODUCTION Overview This manual is written for the models bel
23. Bell 103 300 69 Bell 212 1200 74 V FC 28800 26400 24000 21600 19200 16800 or 14400 The modem may also automatically switch to another modulation automode subject to the following constraints a There is no standard way to switch from Bell to ITU T in automode b The DTE may disable automode operation see lt automode gt 4 25 below c The DTE may constrain the range of modulations available by specifying the lowest and highest rates see lt min_rate gt and lt max_rate gt below 2 lt automode gt is an optional numeric value which enables or disables automatic modulation negotiation using ITU T V 8 or ITU T multi mode handshake The options are lt automode gt Option Selected Notes 0 Automode disabled 1 Automode enabled using V 8 or multi mode Default The default value is 1 which enables automode Note however there are modulations for which there is no automatic negotiation e g Bell 212 lt mod gt 69 For lt automode gt 0 automode disabled i e fixed modulation a If lt max rate gt is within the rates supported by the selected modulation the selected rate is that specified by lt max_rate gt For example AT MS 9 0 1200 4800 selects V 32 4800 bps fixed rate b If lt max rate gt is greater than the highest speed supported by the modulation specified by lt mod gt the starting rate is the highest rate supported by the selected modulation For example AT MS 9 0 2400 144
24. DESCRIPTION OPTION NI MULTI MODE en Auto mode T DIAL MODE ee Tone dial Q0 QUIET MODE ee Off VI VERBOSE MODE ee On WO NEGO PROGRES MSG DTE X4 RESULT CODE TYPE Mode 4 YO LONG SPACE DISC we Off SCH DCE OPTION ee Always on amp DO DTR OPTION Always on amp G0 GUARD TONE 0 Off amp K3 FLOW CONTROL RTS CTS SLO LINE MOD ee PSTN amp PO PULSE RATE 39 61 10pps amp Q5 CONNECT MODE Error Correct amp RI RTS CTS ee in Always on 80 DSR OPTION Always on amp UO V 32 9600 TCM 0 i On amp X0 SYNC CLOCK eee Internal S YO POWER ON PROFILE Profile 0 C3 COMPRESSION Enable Both E2 AUTO RETRAIN Enable FF FB L LINE LEVEL eee Idle Q LINE OUALITY ee Idle RO RINGBACK OPTION Off Al MNP BLOCK SIZE we 128 G0 MODEM FLOW CNTRL Off K5 BREAK CONTROL Mode 5 Rl RI OPTION ee Follow ring HO MNPIOLINK SPEED Hightest KO MNPIOEXT SERVE Off RI RTS OPTION ee Normal Press ESC to stop or press ANY KEY to continue CMD DESCRIPTION OPTION Q1 MNPIOFBACK 2400 oe On S000 RINGS TO ANSWER 000 S002 ESCAPE CHAR eee 043 S004 lt LF gt CHAR Lie 0
25. DTE Rate 0 0to 300 bps 1 600bps 2 1200 bps 3 2400 bps 4 4800 bps 5 9600 bps 6 19200 bps 7 38400 bps or higher Assumed DTE parity 0 Even 1 Not used 2 Odd 3 None Default Guard Tone amp Gn 0 None amp G0 Default 1 None 8G1 2 1800 Hz 8G2 5 9 S25 Delay to DTR This register has two functions describes below Normally this S register 25 defines the length of time the modem recognizes a DTR changed The unit of S register 25 is hundredth of a second When sets to AT amp Q1 it controls the length of time the modem waits to check DTR after establishing a connection The unit of S register 25 is second This allows enough time to disconnect the modem from an asynchronous terminal and attach it to a synchronous terminal without forcing it back to the command mode After this time delay the unit of S register 25 is changed to hundredth of a second All the DTR status changes must last longer than the time specified by S register 25 before the modem recognizes the DTR changed Range 0 255 1 second for synchronous mode 1 right after connect 0 01 second otherwise Default 5 526 RTS to CTS Delay Interval This register controls synchronous mode and asynchronous direct mode only has no effect in asynchronous normal or error correction mode When Clear To Send CTS tracks Request To Send RTS and the modem detects an OFF to ON transition on RTS S register 26 sets the length of time the modem wa
26. FF for more than the period in S register 25 in units of hundredths of a the data connection will be synchronous Selects synchronous data mode This mode allows DTR to act as Voice Data switch The call is manually initiated DTR is inactive When DTR becomes actives the proceeds in originate or answer mode according to panel LCD s setting AT amp Pn Select Pulse Dial Make Break Ratio This command determines the Make Break ratio used during pulse dialing It has no effect in tone dialing AT amp PO AT amp PI AT amp P2 Selects 39 61 Make Break ratio at 10 pulses per second Selects 33 67 Make Break ratio at 10 pulses per second Default Selects 39 61 Make Break ratio at 20 pulses per second 4 14 AT amp P3 Selects 33 67 Make Break ratio at 20 pulses per second AT amp Qn Select Communication Mode This command selects synchronous or asynchronous error control or normal mode operation AT amp QO Communicates in asynchronous mode AT amp QI Communicates in synchronous mode 1 Async to Sync AT amp Q2 Communicates in synchronous mode 2 stored number dial AT amp Q3 Communicates in synchronous mode 3 voice data switch AT amp Q4 Selects AutoSync Set S registers 19 20 and 25 to the desired values before selecting AutoSync operation with amp Q4 After the CONNECT message is issued the modem waits the period of time specified by S register 25 before examining DTR If DTR is ON the modem enters t
27. Mn and AT En commands to support cellular connections Default 3AH Bits 0 4 Initial Cellular Power Level Setting Mn Bit 5 Compromise Equalizer Enable Command En Bits 6 7 Reserved S211 Dial Back up Restore Timer This register defines the restore timer when dial back up enabled That means when leased line s carrier is lost and the dial up line is connected successfully this timer starts to count and when the time is up the modem will hold the dial up line and switch to leased line try to connect to remote modem Range 0 255 Minutes Default 60 212 Dial Back up Timer This register defines the time interval that when the modem try to change line type When dial back up starts leased line is lost and try dial up line or restore starts dial up line is hold and try leased line the modem will try each line type for the time interval that define by this register Range 1 255 Seconds Default 60 5 18 CHAPTER 6 ITU T V 25BIS OPERATION The modem supports ITU T V 25bis command You can use application programs that support V 25bis command to drive the modem Configuration of ITU T V 25bis To configure your modem to operate at ITU T V 25bis mode please follow the procedures below 1 Set the DTE speed DIP switch 1 5 to 1 8 to the speed meets your terminal or computer And set the line speed DIP switch 1 1 to 1 4 according to the remote modem Set the operating mode DIP switch 2 1 2 2 to the
28. On On 6 dBm On On Off On 8 dBm Off On Off On 10 dBm On Off Off On 12 dBm Off Off Off On 14 dBm On On On Off 16 dBm Off On On Off 18 dBm On Off On Off 20 dBm Off Off On Off 22 dBm On On Off Off 24 dBm Off On Off Off 26 dBm On Off Off Off 28 dBm Off Off Off Off 30 dBm Modem Installation Installing Your Modem 1 Look for a location for the modem A suitable location for the modem is one that is near the power outlet and close to the telephone line and your computer It should be placed on a sturdy level surface where there is enough space for unimpeded operation 2 Check the modem s settings Y ou must check the modem carefully to make sure that all the DIP switches and the front panel switches are in proper position Please refer to the sections before on this chapter for details on the modem s settings 3 Connect the modem to the telephone line The modem has a terminal block or RJ 45 connector which allows user to connect 2 wire PSTN 4 wire leased line or 2 wire leased line a The PSTN Line 2 13 Connect the RING and TIP of PSTN line to the positions marked LA and LB b The Telephone Set Line Connect the RING and TIP of telephone set line to the positions marked PA and PB c The 4 Wire Leased Line Connect the transmitting pair of 4 wire leased line to the positions marked TXA and TXB connect the receiving pair of 4 wire leased line to the positions marked RXA and RXB
29. S18 S19 S20 Carriage Return Character Line Feed Character Backspace Character Wait Time for Dial Tone Wait Time for Carrier Pause Time for Dial Delay Carrier Detect Response Time Delay for Hanging Up after Carrier Loss DTMF Duration and Spacing Escape Code Guard Time Bit Mapped Register Bit Mapped Register Test Timer Bit Mapped Option AutoSync HDLC Address or BSC Sync Character Bit Mapped Register Bit Mapped Register Bit Mapped Register Delay to DTR RTS to CTS Delay Interval Bit Mapped Register Bit Mapped Register Flash Dial Modifier Timer Inactivity Timer Bit Mapped Options Status Xon Character XoFF Character Negotiation Fallback Desired Line Speed Delay before Forced Hang up Bit Mapped Options Status Bit Mapped Options Status Bit Mapped Options Status Data Compression Selection Negotiation Selection Break Signaling Control Call Failure Reason Code PSTN Transmit Attenuation Level Fax Transmit Attenuation Level Negotiation Message Options Leased Line Transmit Attenuation Level Cellular Transmit Level Restore Timer Backup Timer 13 0 127 ASCH 10 0 127 ASCH 8 0 32 ASCH 2 2 255 Sec 45 1 255 Sec 2 0 255 Sec 6 1 255 1 Sec 14 0 255 1 Sec 95 50 255 001 Sec 50 0 255 02 Sec 0 0 255 Sec 0 0 255 0 255 01 Sec 1 0 255 01 Sec 70 0 255 01 Sec 0 0 255 10 Sec 17 0 255 ASCII 19 0 255 ASCII 7 0 7 0 0 12 5 0 255 Sec 138 136 or 138 7 0 7 or 128 For compatibility only
30. T L Call Back Security Password List The modem will display all the passwords and telephone numbers after reception of this command AT S Store the Call Back Password and Telephone Number This command stores the password and telephone number for call back security The length of the password is 10 digits and the telephone number is 20 digits The command format is listed below ATL Sn lt password gt lt telephone number gt lt CR gt Where n 0 to 19 If only the password and the colon sign been input the modem will do the password check only 8 3
31. TXA DC 48V GND TXB TB TB TXB RXA RA RA PXA RXB RB RB PXB CH15 CHI4 CH1 CHO AC POWER 10 BASE T Figure 2 6 Rack Mounted Modem Rear Panel Terminal Block The rack mounted modem s rear panel contains AC power source jack DC power source terminator Power failure alarm terminator Ground terminator 16 RS 232 25 pin D type connectors and 16 RJ 45 phone jacks or 16 terminal blocks AC Power Source Jack This jack is for the user to connect the AC power to the modem The acceptable range is from AC 90V to 260V 47Hz to 63Hz DC Power Source Terminator This terminator is for the user to connect the DC 48V power to the modem The acceptable range is from DC 36V to 72V Power Failure Alarm Terminator This terminator is for the user to connect the power failure signal to an alarm circuit to indicate that the redundancy power is failed This function can only be used if this modem is configured to dual power system Groud Terminator This terminator contains the signal groud and framing ground The signal ground is for the user to connect to another equipment The framing ground is for the user to connect to the protection groud of 2 8 the power source to avoid damage from unexpected high voltage RS 232 D Type Connector The 16 D type connectors is for the user to connect the terminal to the modem There are 16 modems in one shelf CHO to CH15 please make sure to make the right connection to respective channel RJ
32. able to error correction connection only This register can be used to ensure that data in the modem buffer is sent before the modem disconnects 1 IfS register 38 is set to a value between 0 and 254 the modem will wait that number of seconds for the remote modem to acknowledge all data in the modem buffer before disconnecting If time expires before all data is sent the NO CARRIER result code is issued to indicate that the data has been lost If all data is transmitted prior to time out the response to the ATHO command will be OK 2 If S register 38 is set to 255 the modem does not time out and continues to attempt to deliver data in the buffer until the connection 1s lost or the data is delivered Range 0 255 seconds Default 5 S39 Bit Mapped Options Status Bits 0 3 Flow control option amp Kn 0 No flow control amp K0 1 Unidirectional RTS CTS amp K1 2 Unidirectional XON XOFF amp K2 3 RTS CTS amp K3 Default 4 XON XOFF amp K4 5 Transparent XON XOFF amp K5 6 Both methods amp K6 7 DTR DSR amp K7 8 Unidirectional DTR DSR amp K8 Bits 4 5 DSR option amp Sn 0 amp SO selected Default 1 amp SI selected 2 amp S2 selected S40 Bit Mapped Options Status Indicates the status of command options Bits 0 1 MNP Extended Services Kn 0 Disable extended services K0 Default 5 14 S41 Bit 2 Bits 3 5 Bits 6 7 1 Enables extended services K1
33. amp Yn AT amp Zn m AT Cn AT En AT L AT Q AT Rn AT An AT Bn AT F AT Gn AT Kn AT Nn Identification Commande 4 6 Speaker Volume Control 4 7 Speaker COMO AA ia la aa 4 7 Set Multi or Fix Mode Handshake 4 7 Return to On Line Mode ninia tener 4 8 SetPulse A IN na 4 8 Result Code Comando ias 4 8 Change The Content of S Register 4 8 SI DAL 4 9 Result Code TP 4 9 Negotiation Progress Message Command 4 11 Extended Result Codes see 4 11 Long Space Dsconnect in 4 11 e a eth co a a a ee 4 12 Serial Port DCD Controla 4 12 Serial Port DTR Control die 4 12 Restore Factory Seine iio ita 4 12 Select Guard Ke n Nisrani iiia ai 4 13 Serial Port Flow Controla 4 13 Telephone Line Type Select Command 4 13 Asynchronous Synchronous Mode Selection 4 14 Select Communication Mode 4 14 Serial Port RTS Option Command 4 15 Serial Port DSR Control Command 4 15 Eoop FestFuncnons ia 4 15 Trellis Coding Modulation Selection Command 4 16 View Profiles and Stored Telephone Number 4 16 Store Current Configuration ie 4 16 Select Synchronous Clock Source 4 16 Power On Profile Selection Command 4 17 Store Telephone Number zis pr
34. and must be the last one on a command 4 17 line AT Cn Data Compression Protocol Selection This command enables or disables data compression negotiation The modem can only perform data compression on an error correction link AT CO Disables data compression AT CI Enables MNPS error correction AT C2 Enables V 42bis data compression AT C3 Enables both MNPS and V 42bis data compression Default AT En Retrain and Rate Negotiation Command AT EO Disables auto retrain feature AT E1 Enables auto retrain feature Default AT E2 Enables auto retrain and rate negotiation with fall back forward feature The AT En command controls the auto retrain and rate negotiation features of the modem Auto retrain enables the modem to monitor the line quality and request a retrain if the line quality is too poor Rate negotiation feature enables the modem to change the line speed during the V 34 V 32bis or V 32 retrain sequence according to the line quality If retrain is encountered the modem will stop the data flow for a shot period of time AT L Line Signal Level Returns a value which indicates the received signal level The value returned is a direct indication at the telephone line connector For example 009 9 dBm 043 43 dBm and so on AT Q Line Signal Quality Reports the line signal quality The line quality shows the line noise the distortion and the frequency shift of the telephone network Based on the lin
35. aster than the old ITU T multi mode hadshake If the modem can not detect an ANSam or CM signal from the remote modem the modem will abort the ITU T V 8 handshake and using other method to connect 3 Fix mode Handshake If you want to connect to the remote modem with a particular speed then the fix mode handshake ATNO is useful for you Using the fix mode handshake will cause the modem to use the DTE speed to make connection The connection speed will not exceed the DTE speed it can only perform the auto fallback from V 34 28800bps to V 34 2400bps or V 32bis 14400bps to V 32 4800bps or V 22bis 2400bps to V 22 1200bps Another way to determine the connection speed is the S register 37 Setting the S register 37 to a none zero value will cause the modem to connect to particular speed regardless of the DTE speed and will also perform the same auto fallback as describes above Flow Control Flow control is the ability to turn on and turn off the flow of information between transmitting devices Most computers and terminals support flow control However if the terminal device does not support flow control it flow control should be disabled on both the modem port and the terminal serial port You should also operate the terminal serial port at the same speed with the actual connection speed The modem can receive and transmit data over the serial port at a speed different from the modem port If the serial port operates at a s
36. ation only The modem will not recognize the Backspace character if it is set to a value that is greater than 32 This character can be used to edit a command line When the echo command is enabled the modem echoes back to the local DTE the Backspace character an ASCII space character and a second Backspace character this means a total of three characters are transmitted each time the modem processes the Backspace character Range 0 32 ASCII decimal Default 8 Backspace S6 Wait Time for Dial Tone before Blind Dialing or after W Dial Modifier Sets the length of time in seconds that the modem will wait before starting to dial after going off hook when blind dialing The Wait for Dial Tone call progress feature W dial modifier in the dial string will override the value in S register 6 The modem always pauses for a minimum of 2 seconds even if the value of S register 6 is less than 2 seconds Range 2 255 seconds Default 2 S7 Wait Time for Carrier after Dial for Silence or for Dial Tone after W Dial Modifier 1 Sets the length of time in seconds that the modem will wait for carrier before hanging up The timer is started when the modem finishes dialing originate or 2 seconds after going off hook 5 4 answer In originate mode the timer is reset and restart upon detection of answer tone 2 Sets the length of time in seconds that modem will wait for silence when encountering the dial modif
37. back up It can meet most application requirements The 2842 modem can operate in both the asynchronous and synchronous modes and provide 100 error free data transmission and data compression with auto dial redial auto answer and full call progress monitoring functions Moreover it supports dynamic packet size adjustment to ensure optimum data throughput 2842 Modem Features Compatible with BELL 103 212A standards and ITU T V 21 V 22 V 23 V 22bis V 32 V 32bis V 25bis V 42 V 42bis recommendations Compatible with ITU T V 34 V 8 V FC recommendations and Microcom MNP10 2842 modem only Provides Hayes AT command set with programmable S register Provides ITU T V 25bis auto answer auto dial recommendation Supports ITU T V 42 V 42bis error correction and data compression recommendations Supports Microcom Networking Protocol MNP Class 5 data compression protocol Provides multi mode handshake according to ITU T recommendation Utilizes full duplex asynchronous transmission with a maximum effective throughput of 57600bps 2842 modem s maximum throughput is 115200bps Provides 100 error free data transmission Supports dynamic packet size adjustment to optimize data throughput Provides 2 wire full duplex dial up line operation Provides 4 wire or 2 wire full duplex leased line operation with dial back up option Asynchronous and synchronous operation selectable on
38. below DIP SWITCH DEFINITION DIP SWITCH SO N STATE DESCRIPTION Reserved Sets secondary chanel on Off Sets secondary chanel off On Off DIP SWITCH S1 TION STATE DESCRIPTION Select different DCE speed see S1 1 S1 4 1 2 3 4 The DCE Line Speed Selection 1 2 3 4 When S0 4 off When S0 4 on On On On On V 21 300 bps BELL 103 Off On On On V 23 1200 75 bps V 34 2400 bps On Off On On V 22 1200 bps V 34 4800 bps Off Off On On V 22b 2400 bps V 34 7200 bps On On Off On V 32 4800 bps V 34 9600 bps Off On Off On V 32b 7200 bps V 34 12000 bps On Off Off On V 32 9600 bps V 34 14400 bps Off Off Off On V 32b 12000 bps V 34 16800 bps On On On Off V 32b 14400 bps V 34 19200 bps Off On On Off V 34 16800 bps V 34 21600 bps On Off On Off V 34 19200 bps V 34 24000 bps Off Off On Off V 34 21600 bps V 34 26400 bps On On Off Off V 34 24000 bps V 34 28800 bps Off On Off Off V 34 26400 bps V 34b 31200 bps On Off Off Off V 34 28800 bps V 34b 33600 bps Off Off Off Off Following DTE Speed The DTE Speed Selection 5 6 7 8 On On On On 1200 bps Off On On On 2400 bps On Off On On 4800 bps Off Off On On 7200 bps On On Off On 9600 bps Off On Off On 12000 bps On Off Off On 14400 bps Off Off Off On 16800 bps On On On Off 19200 bps Off On On Off 21600 bps On Off On Off 24000 bps Off Off On Off 26400 bps On On Off Off 28800 bps Off On Off Off 38400 bps On Off Off Off 57600 bps Off Off Off Off 115200 bps The Modem Operating Mode Sel
39. both DIP switch and AT command Provides manual dial manual answer auto dial auto answer redial and full call progress monitoring functions Group III Facsimile with EIA SP 2388 service class 1 and class 2 command as an option CHAPTER 2 INSTALLATION Package Contents Carefully unpack the product package that you have received The following is a checklist of the contents of the package 2842 RM modem A Dip Switch Definition A modem power cable Two telephone cables for RJ 45 and RJ 11 A terminal box 2842 User s Manual If there is any wrong missing or damaged parts please contact your dealer Modem Panel Description Modem Front Panel SQ TST HS RD TD CD CTS TR SL MR V D TE O A MA AA AL DL RL TP Figure 2 1 Rack Mounted Modem Front Panel 2 1 sO HS TD CTS S 0000000000 RD CD TR MR Figure 2 2 Standalone Modem Front Panel The 2842 RM modem s front panel contains ten LED indicators and six push button switches see Figure 2 1 and 2 2 These LED indicators serve to display the current operating status and these push button switches serve to configure the modem The following sections describe the functions of LED indicators and the push button switches LED Indicators SO TST HS MR Signal Quality Indicates the signal quality of the telephone line On Good Flash Medium Off Bad Test I
40. clocks are turned ON with the frequency of 1200 Hz or faster corresponding to the speed that is selected for modem operation AT amp X0 Selects internal clock The modem generates the transmit clock signal and applies it to the TXCLK output at the serial interface Default AT amp KXI Selects external clock The local DTE causes the transmit clock signal on the XTCLK input of the serial interface The modem applies this clock to the TXCLK output at the serial interface AT amp X2 Selects slave receive clock The modem drives the transmit clock signal from the incoming carrier and applies it to the TXCLK output at the serial interface AT amp Yn Power On Profile Selection Command This command selects the prestored profile O or 1 to recall when turn ON the power of the modem This command has NO effect when issuing the ATZ command the user should use the ATZO or ATZ1 to recall profile when software reset AT amp YO Recalls profile 1 when power on Default AT amp YI Recalls profile 2 when power on AT amp Y2 Recalls profile 3 when power on AT amp Y3 Recalls profile 4 when power on AT amp Zn m Store Telephone Number AT amp Zn mThe n indicates the telephone number locations is valid within 0 to 9 The mis a dial string of up to 35 characters Valid dial string characters are O to 9 dial modifiers and for tone dialing Modem will ignore invalid characters and truncate dial strings longer than 35 characters This comm
41. d Options Status Indicates the status of command options S22 Bit 0 Bit 1 Bit 2 Bits 3 4 Bits 5 6 Bit 7 Reserved Ring indicator control Rn 0 Ring indicator ON RO 1 Ring indicator OFF after answer AR 1 Default CTS behavior amp Rn 0 CTS tracks RTS amp RO 1 CTS always on amp R1 Default DTR behavior amp Dn 0 amp DO selected 1 amp DI selected 2 amp D2 selected Default 3 amp D3 selected RLSD DCD behavior amp Cn 0 amp CO selected 1 CI selected Default 2 amp C2 selected Long space disconnect Yn 0 YO selected Default 1 YI selected Bit Mapped Options Status 5 8 Indicates the status of command options Bits 0 1 Bits 2 3 Bits 4 6 Bit 7 Speaker volume Ln 0 Low LO same as L1 1 Low L1 Default 2 Medium L2 3 High L3 Speaker control Mn 0 Speaker OFF MO 1 Speaker ON until connect M1 Default 2 Always ON M2 3 ON during handshake M3 Limit result codes Xn 0 XO selected 4 Xl selected 5 X2 selected 6 X3 selected 7 X4 selected Default Ring back message command Rn 0 Disables ring back message RO Default 1 Enables ring back message R 1 523 Bit Mapped Options Status Indicates the status of command options Bit 0 Bits 1 3 Bits 4 5 Bits 6 7 Grant RDL 0 RDL not allowed amp T5 1 RDL allowed amp T4 Default
42. d and framing ground The detail descriptions are listed below SG Signal Ground Terminal Connect this terminal to another eguipmen s SG may reduce the noise interference 2 6 FG Framing Ground Terminal Connect this terminal to the framing ground of the power source the earth can prevent some damage from unexpected high voltage TXA and TXB Transmit Line Terminals These two terminals are the transmit line when in 4 wire leased line mode They also are the full duplex transmit and receive line when in 2 wire leased line mode RXA and RXB Receive Line Terminals These two terminals are the receiving line when in 4 wire leased line mode LA and LB Telephone Line Terminals These two terminals are for the user to connect to the public telephone line PA and PB Phone Set Terminals These two terminals are for the user to connect to the telephone set Rack Mounted Modem Rear Panel ON OFF RJ4 R945 RJ45 FG SG O 0 BUZZER O O DC 48V GND LEC SU CH15 0 0 CHIA CHO CM AC POWER 10 BASE T Figure 2 5 Rack Mounted Modem Rear Panel RJ 45 2 7 CHIS CHIA Cu CHO NSOE Z 3 FG SG BUZZER LA LA LA LA LB LB LB LB PA PA PA PA PB PB PB PB TXA TA TA
43. e completion of the 4 4 handshake if the AT KO command is issued Dial Modifies The valid dial string parameters are described below Punctuation characters may be used for clarity with parentheses hyphen and spaces being ignored 0 9 Dialing digits O to 9 a The star digit tone dialing only The gate digit tone dialing only A D DTMF digits A B C and D J Perform MNP 10 link negotiation at 1200bps for this call only K Enable power level adjustment during MNP 10 link negotiation for this call only L Re dial last number The modem will re dial the last valid telephone number The L must be immediately after the D with all the following characters ignored P Select pulse dialing Pulse dial the numbers that follow until a T is encountered T Select tone dialing Tone dial the numbers that follow until a P is encountered R This command will be accepted but not acted on S n Dial the number stored in the directory n 0 to 5 See AT amp Zn m Flash the modem will go on hook for a time defined by the value of S register 29 W Wait for dial tone The modem will wait for dial tone before dialing the digits following W If no dial tone is detected within the time specified by S register 7 the modem will abort the rest of the sequence return on hook and generate an error message Wait for silence The modem will wait for at least 5 seconds of silence in the
44. e from voice to data or vice versa Originate Answer Selects between the originate and the answer mode When the switch is in the PUSH position the modem is in the originate mode when in the POP position the modem is in the answer mode In the originate mode activating the data mode sets your modem to a waiting for answer tone state Conversely in the 2 3 answer mode activating the data mode makes your modem generate an answer tone This switch is effective only when D V been pushed or the DIP sw2 6 2 wire or 4 wire leased line operation been on otherwise you should use AT command to enter originate or answer mode MA AA Manual Answer Auto Answer AL RL DL TP Selects the manual answer or auto answer If this switch is in PUSH position the modem is in the auto answer mode The S register O defines the ring count that the modem will answer the phone If this switch been pushed while the S register is 0 the modem will answer the phone at the end of the first ring If this switch is in POP position the modem will not answer phone even the S register 0 contains none 0 value Analog Loopback In command mode sets the switch to PUSH position will cause the modem to perform analog loopback test If you push this switch during connection the modem will drop the line and performing analog loopback Remote Digital Loopback When connected sets the switch to PUSH position will ca
45. e made as a force fallback of V 42 with S register 48 and 36 S48 The V 42 Negotiation Action Register The negotiation process determines the capabilities of the remote modem If the capabilities of the remote modem are known and negotiation is unnecessary this process can be bypassed if desires The following options are selectable using S register 48 S48 7 Enables negotiation Default S48 0 Disables negotiation bypass the detection and negotiation phases and process with LAP M S48 128 Disables negotiation bypass the detection and negotiation phases and proceed at once with the fallback action specified in S register 36 This option can be used to force the modem to use MNP to communicate S36 The V 42 Negotiation Fallback S register 36 specifies the action to take when the desired connection cannot be made The options are S36 0 Modem disconnects S36 21 Modem stays on line and a Direct mode connection is established 37 S36 3 Modem stays on line and a Normal mode connection is established S36 4 An MNP connection is attempted if it fails the modem disconnects S36 5 An MNP connection is attempted if it fails a direct connection iS established S36 7 An MNP connection is attempted if it fails a normal connection is established Default These fallback options are initiated immediately on connection if S register 48 128 This register can be used with S register 48 128 to set the mode
46. e quality retrain or fallback fall forward may be initiated if enabled by AT EI or AT E2 4 18 The line quality is reported in three decimal digits range from 000 to 128 The modem will return ERROR if not connected to the remote modem AT Rn Ring Back Message Command AT RO Disables ring back message Default ATGR1 Enables ring back message If issues the AT R1 command the modem will return the RING BACK or 102 depending on the ATVn command message to indicate the ring back signal AT An Select Maximum MNP Block Size The modem will operate an MNP error correction link using a maximum block size controlled by the parameter supplied ATVAO The maximum MNP block size to be 64 characters AT AI The maximum MNP block size to be 128 characters Default ATVA2 The maximum MNP block size to be 192 characters ATVA3 The maximum MNP block size to be 256 characters AT Bn Transmit Break to Remote In non error correction mode the modem will transmit a break signal to the remote modem with a length in multiples of 100 ms according to parameter n specified If a number in excess of 9 is entered 9 is used The command works in conjunction with the S register 82 In error correction mode the modem will signal a break through the active error correction protocol giving no indication of the length The modem will return a NO CARRIER result code if not connected Note When the modem receives a break from the
47. e remote modem However when the capabilities of the remote modem are known and negotiation is unnecessary this process can be bypassed if desired If an invalid number is entered it is accepted into the S register but S register 48 will act as if 128 has been entered S48 0 Disables negotiation bypass the detection and negotiation phases and proceed with LAP M S48 7 Enables negotiation S48 128 Disables negotiation bypass the detection and negotiation phases and proceed at once with the fallback action specified in S register 36 This content can be used to force MNP Default 7 S82 Break Handling Options S register 82 is for compatibility purpose only changing this register will not have any affect S86 Call Failure Reason Code When the modem reports a NO CARRIER result code a value is written to this S register to help determine the reason for the failed connection S register 86 records the first event that contributes to a NO CARRIER message The cause codes are S86 0 Normal disconnect no error occurrs S86 4 Loss of carrier S86 5 V 42 negotiation failed to detect an error correction modem at the other end S86 9 The modems could not find a common protocol S86 12 Normal disconnect initiated by the remote modem S86 13 Remote modem does not respond after 10 re transmissions of the same message S86 14 Protocol violation 5 16 S91 PSTN Transmit Attenuation Level Sets the transmit attenuation leve
48. ecial functions that offer more applications and secure protections for users These functions are only on the modem equip with EPROM version upper than 2 0 The details of four special functions are listed below Connection Security Callback Security Connection Security This function is designed specially for people who need security connection The connection modems have to be model 2842 RM or 1442 RM and the same password when this function activated please refer to AT PC for password setting When the modems connect it will confirm password each other If the password check is passed the modems enter data mode If not hang up This action has no need to enter password it will confirm right after connection automatically The AT Commands for Connection Security AT OP Set Connection Security This command controls the ON OFF of the connection security You need to enter password to turn ON or OFF the function AT PC Change the Password of the Connection Security The length of the password are 5 digits You can use this command to change the password The factory default is modem Call Back Security This function is designed for restricted user group The user have to use 8 1 particular phone line and password to connect This modem can store 20 sets of password and telephone number The length of password are 10 digits and telephone number are 20 digits You can use colon sign to separate
49. ection Direct Mode MNP Mode V 42 Mode Auto Reliable Mode The Flow Control Selection Disable Flow Control Enable Bidirection Xon Xoff Flow Control Enable Unidirection CTS RTS Flow Control Enable Bidirection CTS RTS Flow Control The Line Operation Selection 4 Wire Leased Line Operation 2 Wire Leased Line Operation Power On Dial Up Line Operation Dial Up Line Operation Enable Dial Backup Function Disable Dial Backup Function Non Redundancy Code Modulation Trellis Code Modulation DIP SWITCH S3 5 6 7 8 On Off 3 4 On On Off On On Off Off Off 5 6 7 On On On On DESCRIPTION DTR following ITU V 24 108 1 Recommandation DTR following ITU V 24 108 2 Recommandation Ignore RTS RTS following ITU V 24 105 Recommandation Synchronous Asynchronous Operation Mode Selection Synchronous Mode with External Clock Synchronous Mode with Slave Clock Synchronous Mode with Internal Clock Asynchronous Mode with 8 bits Character Length Asynchronous Mode with 9 bits Character Length Asynchronous Mode with 10 bits Character Length Asynchronous Mode with 11 bits Character Length V 25bis Command AT Command Read Dip Switch for Power On Configuration Read NVRAM for Power On Configuration Reserved Transmit Level Selection for Dial Up Line Operation 4 dBm 6 dBm 8 dBm 10 dBm Transmit Level Selection for Leased Line Operation 0 dBm 2 12 Off On On On 2 dBm On Off On On 4 dBm Off Off
50. er off while dialing then on until the modem receives a carrier Controls the speaker Immediately takes effect upon execution ATNn Set Multi or Fix Mode Handshake ATNO Fix mode handshake The connection speed depends on the DTE speed or S register 37 speed It can NOT connect with higher speed modem The remote modem must have the ability to fall back 1f using higher speed than your 4 7 modem ATNI Multi mode handshake Follows the recommendation of ITU T multi mode handshake It can automatically change the connection speed to make most efficient connection Default ATN3 Same as ATN1 but without V 23 mode This command controls the handshake method of the modem When the modem is set to answer mode it usually sets to multi mode handshake ATNI to get the most effective connection If the remote modem s speed is known you can set the modem to fix mode handshake and adjust the DTE speed to meet the remote modem s speed to reduce the time needed for handshake ATOn Return to On Line Mode This command determines how the modem will enter the on line data mode If the modem is in the escape on line command mode whether enters the on line data mode with or without retrain If the modem is in the off line command mode no connection ERROR is reported ATOO Enters on line data mode without a retrain Generally if a connection exists this command connects the DTE back to the remote modem after an escape
51. he synchronous operating state if DTR is OFF the modem terminates the line connection and returns to the asynchronous command state Stopping AutoSync AutoSync operation is stopped upon loss of carrier or the ON to OFF transition of DTR Loss of carrier will cause the modem to return to the asynchronous command state and either do not terminate the line connection AT amp DI active or terminate the line connection any other AT amp Dn command active AT amp Q5 Communicates in error correction mode Default AT amp Q6 Communicates in asynchronous mode with automatic speed buffering for interfaces requiring constant speed between the DTE and DCE AT amp Rn Serial Port RTS CTS Option Command AT amp RO CTS follows RTS at all time Default AT amp RI Assumes CTS always on This command selects the CTS option of the serial port Some of the DTE need to set different options you can select AT amp RO or AT amp RI according to the specification of DTE This command effects only in synchronous mode and asynchronous direct mode In V 25bis operation the CTS acts according to V 25bis recommendation AT amp Sn Serial Port DSR Control Command 4 15 AT amp SO DSR remains ON at all time Default AT amp SI DSR follows the ITU T recommendation AT amp S2 DSR follows carrier AT amp Tn Loop Test Functions AT amp TO Ends loop test AT amp TI Local analog loop back AT amp T3 Local digital loop back AT amp T4 Responds to remote d
52. ided for compatibility with existing communication software S register 37 is not updated by the AT Ms command 2 Sub parameters can be not entered enter a comma only or lt ENTER gt to skip the last sub parameter but remain at their current values Reporting Selected Options The modem can send a string of information to the DTE consisting of selected options using the following command AT MS The response is lt mod gt lt automode gt lt min_rate gt lt max_rate gt For example 11 1 300 28800 Reporting Supported Options The modem can send a string of information to the DTE consisting of supported options using the following command 4 24 AT MS The response is list of supported lt mod gt values list of supported lt automode gt values list of supported lt min_rate gt values list of supported lt max_rate gt values For example 0 1 2 3 9 10 11 64 69 74 0 1 300 28800 300 28800 Sub Parameter Definitions 1 lt mod gt A decimal number which specifies the preferred modulation automode enabled or modulation automode disabled to use in originating or answering a connection The options are lt mod gt Modulation Possible Rates bps Notes 0 V 21 300 1 V 22 1200 2 V 22 bis 2400 or 1200 3 V 23 1200 See Note I 9 V 32 9600 or 4800 10 V32 bis 14400 12000 9600 7200 or 4800 11 V 34 28800 26400 24000 21600 19200 16800 14400 12000 9600 7200 4800 or 2400 Default 64
53. ier before continuing with the next dial string parameter Range 1 255 seconds Default 45 SS Pause Time for Dial Delay Sets the time in seconds that the modem must pause when the dial modifier is encountered in the dial string Range 0 255 seconds Default 2 S9 Carrier Detect Response Time Sets the time in tenths of a second that the carrier must be present before the modem considers it valid and turns on CD signal As this time is increased there is less chance to detect a false carrier due to noise from the telephone line Range 1 255 tenths of a second Default 6 0 6 second S10 Delay for Hang Up after Carrier Loss This delay time allows the carrier to momentarily disappear without causing the modem to disconnect Both modems should have equal values in S register 10 otherwise disconnect occurs when the lower value is reached If the modem can NOT disconnect the line correctly please adjust the register to a lower value If the modem disconnects the line very often please adjust the register to a higher value If the modem connect to V 32 or above protocols this register is ignored The modem will use line quality to disconnect the telephone line Range 0 255 tenths of a second Default 14 1 4 seconds 5 5 S11 DTMF Duration and Spacing This register controls the duration and spacing of DTMF tones The content of this register representing the duration and spacing between DTMF tones genera
54. iest 4 17 Data Compression Protocol Selection 4 17 Retrain and Rate Negotiation Command 4 18 Line Stena Evelina ai Lul ds 4 18 Line Signal Ola 4 18 Ring Back Message Commande 4 18 Select Maximun MNP Block Size 4 18 Transmit Break to Remote 4 19 View Stored Telephone Number 4 19 Modem Port Flow Control 4 19 Break Controls NN 4 19 Operatino Mode a bia 4 20 AT Rn Serial Port Ring Indicator Control 4 21 AT S Modem Status Dispaly aaa ala 4 21 AT Kn Keyboard Interrupt Commande 4 23 AT Rn Senal PortR ES Opiong ssieas reno 4 23 AT MS Select Modulationi rosa 4 23 The Escape Code us desserten 4 27 AT Mn Power Level Adjust Command 4 27 AT Hn Link Negotiation Speed ix cacsccsssscaeiokctsseaxsdeaesreeseeonsneden 4 28 AT Kn MNP Extended Services rrneroononoroneveenorernnrevennerenrere 4 28 AT Qn Enable Fallback to V 22b1s V 22 4 28 ATOMn Initial Cellular Power Level Setting 4 29 AT En Compromise Equalizer Enable Command 4 29 4 3 AT Command Set ATA Manual Answer The modem will go off hook and attempt to answer an incoming call if correct conditions are met Upon successful completion of answer handshake the modem will go on line in answer mode The modem will en
55. igital loop back request Default AT amp TS Ignores remote digital loop back request AT amp T6 Initiates ITU T remote digital loop back AT amp T7 Remote digital loop back with self test AT amp T8 Local analog loop back with self test AT amp Un Trellis Coding Modulation Selection Command This command selects whether to use trellis coding modulation or not Using trellis coding modulation will provide up to 4 dB of extra noise immunity improve data reliability in V 32 mode Both the local and remote modem should be set to enable to ensure trellis coding modulation takes place AT amp UO Enables trellis coding modulation Default AT amp UI Disables trellis coding modulation AT amp V View Profiles and Stored Telephone Number This command shows the active configuration and four user profiles AT amp Wn Store Current Configuration AT amp WO Saves current configuration at user profile 1 including commands and registers Default AT amp WI Saves current configuration at user profile 2 including commands and registers AT amp W2 Saves current configuration at user profile 3 including commands and registers AT amp W3 Saves current configuration at user profile 4 including commands and registers 4 16 AT amp Xn Select Synchronous Clock Source Selects the source of the transmit clock for the synchronous mode operation In asynchronous mode the transmit and receive clocks are turned OFF In synchronous mode the
56. in S register 12 the modem will enter escape mode In the escape mode the modem will not drop the line but entering the command mode Any characters that coming from the DTE will be treated as command rather than data and will be executed after ENTER character has been received But some of the AT commands can not be excuted during the escape mode such as ATDn ATA AT amp Wn etc The Modem Port and Serial Port Modem port means data link between two modems serial port means data link between computer or terminal DTE and modem DCE The modem port and serial port of the modem are independent There are buffers between modem and serial ports so different speeds are possible The following sections discuss these related concepts 3 1 Automatic Speed Matching Automatic speed matching matches the speed of the modem port to the speed of the remote modem connection can be established between two modems even if the two modems are not initially set to the same speed If the remote modem is not capable of automatic speed matching a connection may or may not be established depending on the speed to which both modems are set The connection speed may be determined by the originating or the answering speed The resulting connection speed will be shown on the terminal as below CARRIER 28800 PROTOCOL LAP M COMPRESSION V 42BIS CONNECT 115200 The CARRIER 28800 means the modem is connecting to a remote modem in ITU T V 34 which allow
57. its before turning on CTS CTS tracks RTS when AT amp RO is set Range 0 255 hundredths of a second Default 1 S27 Bit Mapped Options Status Indicates the status of command options Bits 0 1 3 Synchronous asynchronous selection amp Mn amp Qn Bit3 Bit1 BitO 0 0 0 8MO0 or amp Q0 selected amp M1 or amp Q1 selected amp M2 or amp Q2 selected amp M3 or amp Q3 selected amp Q4 selected amp Q5 selected Default i a SS Do pre CN DD 5 10 Bit 2 Bits 4 5 Bit 6 Bit 7 1 1 0 amp Q6 selected Reserved Synchronous clock selection amp Xn 0 Internal clock amp X0 Default 1 External clock amp X1 2 Slave clock amp X2 ITU T Bell mode selection Bn 0 ITU T mode BO 1 Bell mode B1 Default Reserved S28 Bit Mapped Options Status Indicates the status of command options Bits 0 2 Bits 3 4 Bit 5 Bits 6 7 Reserved Pulse dialing amp Pn 0 39 61 Make Break ratio at 10 pulses per second SPO 1 33 67 Make Break ratio at 10 pulses per second amp P1 Default 2 39 61 Make Break ratio at 20 pulses per second amp P2 3 33 67 Make Break ratio at 20 pulses per second amp P3 Reserved MNP Link Negotiation Speed Hn 0 Link negotiation at highest speed HO Default 1 Link negotiation at 1200 bps H1 2 Link negotiation at 4800 bps H2 S29 Flash Dial Modifier Time Sets the length of time in units of 10mS
58. ity bit when received the V 25bis command from DTE The modem sends 7 data bits and odd parity to computer when the modem responses to DTE The control field of each response should be 03H and the last response should be 13H if the responses are multiple 6 4 CHAPTER 7 DIAL BACK UP OPERATION The modem provide dial back up function You can use this function to ensure the data s continuity of leased line operation if your data is important If leased line is malfunctioned the modem will automatically dial the stored number in NVRAM and try to connect to dial up line in order to continue data transmission The data transmission must stop during the process of telephone line change flow control is essential to avoid data lose while dial back up function is activated Preparation 1 Use the AT command AT amp Zn m to store the remote telephone number into the NVRAM of the modem Upto six telephone numbers can be stored 2 Connect the leased line and dial up line to the rear panel connectors please refer to Chapter 2 Modem Rear Panel for detail connect information 3 Change the content of the registers S211 S212 according to the system requirement Register S211 is the dial back up automatically restore timer the unit is minute and the default is 60 minutes register S212 is the dial back up timer the unit is second and the default is 60 seconds AT Use the AT command or DIP switch 2 3 to 2 7 to activate flow
59. l from 0 to 15 dB for the PSTN mode resulting in a transmit level from 0 to 15 dBm Range 0 to 15 dB Corresponding to 0 to 15 dBm transmit level Default 10 10 dBm transmit level S92 Fax Transmit Attenuation Level Sets the transmit attenuation level from 0 to 15 dB for the fax mode resulting in a transmit level from 0 to 15 dBm Range 0 to 15 dB Corresponding to 0 to 15 dBm transmit level Default 10 10 dBm transmit level S95 Extended Result Codes The bits in this register can be set to override some of the ATWn command options A bit set to a 1 in this register will enable the corresponding result code regardless of the ATWn setting Bit 0 CONNECT result code indicates DCE speed instead of DTE speed Bit 1 Appends ARQ to CONNECT XXXX result code in error correction mode XXXX bps rate Bit 2 Enables CARRIER XXXX result code XXXX bps rate Bit 3 Enables PROTOCOL XXXX result code XX XX protocol identifier Bit 4 Reserved Bit 5 Enables COMPRESSION XXXX result code XXXX compression type Bits 6 7 Reserved S99 Leased Line Transmit Attenuation Level Sets the transmit attenuation level from O to 31 dB for the Leased Line mode resulting in a transmit level from 0 to 31 dBm Range 0 to 31 dB Corresponding to 0 to 31 dBm transmit level Default 10 10 dBm transmit level 5 17 S201 Cellular Transmit Level The bits in this register are set by the AT amp
60. les or disables the echo of characters to the DTE according to the parameter supplied ATEO Disables command echo ATEI Enables command echo Default ATHn Hang Up The Telephone Line ATHO Directs the modem to disconnect the remote modem and hang up Default ATHI Causes the modem to go off hook ATIn Identification Command ATTO Reports product code 288007 ATII Reports a pre computed checksum in the format of CheckSum XXX ATP Performs the calculation of ROM checksum and check with 46 the pre computed checksum If correct reports OKT not reports ERROR ATI3 Reports firmware revision in the format of 28800 Version SA X X ATI4 Reports model name EPROM version issue date ATI5 Reports country code area code ATI6 Reports DATA PUMP version Returns the identification code and checksum result of the modem REMARK 14400bps Modem Function For the 14400bps modem it reports 14400 when ATIO command is received It reports 14400 Version SB X X when ATI3 command is received ATLn Speaker Volume Control The modem uses software volume control to avoid poor contact of the volume VR The volume is divided into 3 steps described below ATLO L1 Low speaker volume ATL2 Medium speaker volume Default ATL3 High speaker volume ATMI Speaker Control ATMO Speaker always off ATMI Speaker on until the modem receives a carrier Default ATM2 Speaker always on ATM3 Speak
61. low control must be activated when in error correction mode The ITU T V 42 V 42bis The ITU T V 42 supports two methods of error correction LAP M and as a fallback Alternative Protocol MNP4 compatible The modem offers a negotiation technique for determining and establishing the best method of error correction between two modems This technique involves two phases the detection phase and the negotiation phase In the detection phase which occurs immediately after the establishment of the modem handshake the communicating modems exchange a sequence of detection patterns to verify that both modems support the error correction technique In the negotiation phase which follows the 3 6 detection phase the communicating modem exchange configuration information to make a best connection When the modem originates a call it will send a detection pattern and wait for the answering modem to respond If the answering modem responds they will enter the negotiation phase 1f the answering modem does not respond the originating modem will send the alternative handshake pattern and try to make the alternative connection If the detection phase fails or negotiation does not achieve the desired connection type the modem can hang up fallback to alternative protocol MNP4 or fallback to a standard asynchronous mode Desired action to take is selected with S register 36 Since MNP does not support a detection phase the selection of MNP must b
62. m reports only the DTE speed 4 10 e g CONNECT 57600 Subsequent responses are disabled Default ATWI Upon connection the modem reports the line speed the error correction protocol and the DTE speed respectively Subsequent responses are disabled ATW2 Upon connection the modem reports the DCE speed e g CONNECT 14400 Subsequent responses are disabled ATXn Extended Result Codes ATXO The modem ignores dialtone and busy tone when dialing Sends standard result codes when a connection is completed regardless of connection speed ATX1 The modem ignores dialtone and busy tone Sends extended result codes when a connection is made ATX2 The modem ignores busy tone Sends NO DIALTONE if no dialtone is detected in 5 seconds of a dial attempt Sends extended result codes when a connection is made ATX3 The modem ignores dial tone Sends BUSY if busy tone is detected Sends extended result codes when a connection is made ATX4 The modem sends NO DIALTONE if no dialtone is detected in 5 seconds of a dial attempt Sends BUSY if busy tone is detected Sends extended result codes when a connection is made Default ATYn Long Space Disconnect This command sets the modem whether to disconnect when a space of 1 6 seconds or more is received from the remote modem or not ATYO Disables the long space disconnect feature Default ATYI Enables the long space disconnect feature ATZn Reset The rese
63. m to MNP mode only For example Modem with S48 128 FUNCTION S36 4 An MNP is attempted if fails disconnects S36 5 An MNP is attempted if fails a Direct mode is made S36 7 An MNP is attempted if fails a Normal mode is made S46 Data Compression Protocol Selection This register selects whether the data compression is effective or not S46 136 Execute the error correction protocol without data compression S46 138 Execute the error correction protocol with data compression The GIII Fax Function The modem supports the ITU T V 27ter V 29 and V 17 for GIII fax It uses the EIA Class 1 and Class 2 command for compatibility of most communication software It can support from 2400bps to 14400bps GIII Fax speed 3 8 The Voice Function The modem optionally supports VOICE function The voice function include a voice pass through mode which allows the host to transmit and receive audio signals It uses an ADPCM voice coder and decoder for compression and decompression It can compress and decompress voice signals to allow efficient digital storage of voice messages Using this voice option with the voice application software to achieve the voice function such as answering machine voice on demand and voice mail function 3 9 CHAPTER 4 AT COMMAND GUIDELINES Introduction This chapter gives you a detailed explanation of commands available The commands include the Hayes AT command set and some other commands that
64. mmand mode on detecting ON to OFF transition of DTR AT amp D2 Goes ON HOOK on detecting ON to OFF transition of DTR Default AT amp D3 Resets the modem on detecting ON to OFF transition of DTR 412 Controls the action on detecting the ON to OFF transition of DTR You can use this command to meet the special requirements for terminals or computers AT amp Fn Restore Factory Setting The factory default setting is stored on the EPROM whatever the modem sets you can always return to default setting by this command AT amp FO Restore factory configuration 0 Default AT amp FI Restore factory configuration 1 The AT amp FO restores the default settings in each AT command description The AT amp FI restores the AT D2S0 1595 44 command and the others are the same as AT amp FO AT amp Gn Select Guard Tone AT amp GO Disables guard tone Default AT amp GI Disables guard tone AT amp G2 Selects 1800 Hz guard tone AT amp Kn Serial Port Flow Control AT amp KO Disables local flow control AT amp K1 Enables unidirectional RTS CTS hardware flow control AT amp K2 Enables unidirectional XON XOFF software flow control AT amp K3 Enables bi directional RTS CTS hardware flow control Default AT amp K4 Enables bi directional XON XOFF software flow control AT amp K5 Enables transparent XON XOFF software flow control AT amp K6 Enables both RTS CTS and XON XOFF flow control Default for fax mode AT amp K7 Enables bi di
65. ndard result code is reported while the ATXO command is issued The extended resulted code is reported while other ATXn parameter is issued Some other result codes are reported upon ATW1 command issued The detail result codes are listed below Short Form Long Form Standard Extended 0 OK S 1 CONNECT 2 RING j 3 NO CARRIER 4 ERROR A 5 CONNECT 1200 6 NO DIALTONE 7 BUSY S 8 NO ANSWER AS 4 9 9 CONNECT 0600 10 CONNECT 2400 11 CONNECT 4800 12 CONNECT 9600 13 CONNECT 7200 14 CONNECT 12000 15 CONNECT 14400 16 CONNECT 19200 17 CONNECT 38400 18 CONNECT 57600 19 CONNECT 115200 22 CONNECT 1200TX 75RX 23 CONNECT 75TX 1200RX 40 CARRIER 300 44 CARRIER 1200 75 45 CARRIER 73 1200 46 CARRIER 1200 47 CARRIER 2400 48 CARRIER 4800 49 CARRIER 7200 50 CARRIER 9600 51 CARRIER 12000 52 CARRIER 14400 53 CARRIER 16800 54 CARRIER 19200 55 CARRIRE 21600 56 CARRIER 24000 57 CARRIER 26400 58 CARRIER 28800 59 CONNECT 16800 61 CONNECT 21600 62 CONNECT 24000 63 CONNECT 26400 64 CONNECT 28800 66 COMPRESSION CLASS 5 67 COMPRESSION V 42 bis 69 COMPRESSION NONE 70 PROTOCOL NONE T11 PROTOCOL LAPM 80 PROTOCOL ALT 81 PROTOCOL ALT CELLULAR F4 FCERROR 2 Xx Xx Xx Xx Xx Xx Xx Xx Xx Xx Xx Xx Xx Xx Xx Xx Xx KF Xx Xx Xx XxX Xx Xx Xx Xx KF HF SS 2 2 KF SZ SS Xx KF KF ATWn Negotiation Progress Message Command This command controls the format of CONNECT messages ATWO Upon connection the mode
66. ndicator Lights up when the modem is performing self test It will also flash when the modem is in test mode and the test failed or when the modem connect in error correction mode and found error data received High Speed Indicates the speed of the modem In command mode if the DTE to Modem speed is 9600bps or above the indicator will light up In data mode if the line speed is 9600bps or above the indicator will light up Modem Ready Lights up when power is applied to the modem 2 2 CD CTS TR SL TD Carrier Detect Lights up when carrier signal from a remote modem is detected Clear to Send Indicates the status of RS 232C D SUB connector pin 5 This LED turns ON when the modem is ready to receive data from DTE Terminal Ready Lights up when the RS 232C DTR signal is asserted which indicates that the computer or terminal is ready Switch Leased Line This LED lights up when the modem is on switch line dial up line goes off when on leased line This LED also indicates the dial back up by flashing Receive Data Flashes when the local DTE Data Terminal Equipment receives data from the modem Transmission Data Flashes when your local DTE transmits data into the serial port of the modem Front Panel Switches V D O A Voice Data Toggles between the voice mode and the data mode This switch is a toggle switch push and release the switch once will change the mod
67. ow 1 The standalone 28800bps modem 2 The rack mounted 28800bps modem We will call these modems 2842 modem latter on and will show the difference between these modems if necessary The 28800bps standalone modems are standalone modems with individual casing while the 28800bps rack mounted modems are 16 modems build into a 19 inches shelf which can be fixed into a 19 inches rack The modem is a high speed Hayes compatible modem which can be used with various types of computers and terminals It meets to the BELL 103 212A standards and ITU T V 21 V 22 V 23 V 22bis V 32 V 32bis V 25bis V 42 and V 42bis recommendations and also equippes with the Microcom Networking Protocol MNP class 5 service It can be instructed via the Hayes AT command set to automatically dial or answer or to perform MNP class 5 service or ITU T V 42 V 42bis recommendations It can also be instructed via ITU T V 25bis command to perform auto dial or auto answer functions The effective throughput of full duplex asynchronous communication can be 57600bps and also the modem can support the ITU T multi mode handshake recommendation REMARK 2842 Modem Function For the 2842 modem it also compatible with the ITU T V 34 V 8 V FC and MNPIO to perform 28800bps communication The effective throughput is also increased to 115200bps It supports 2 wire full duplex dial up line 2 wire full duplex leased line and 4 wire full duplex leased line with 2 wire dial
68. peed greater than the modem port the buffer fills to capacity If the computer 3 3 or terminal attached to the serial port of the modem supports flow control there is no loss of data when the buffer fills Flow control is achieved by using two methods software flow control and hardware flow control Software Flow Control The modem supports two types of software flow control the first is the unidirectional flow control and the second is the bi directional flow control In unidirectional software flow control only the modem can control the terminal s data flow Xorr and Xon characters are sent by the modem to the local or remote computer The XorF character Determined by S register 33 signals the local or remote computer to pause the flow of data while the Xon character Determined by S register 32 signals the local or remote computer to resume the flow of data The bi directional software flow control uses Sort and Xon characters to control both the modem s and the computer s or terminal s data flow Your modem supports software flow control on both the modem port and the serial port it also supports hardware flow control on the serial port When flow control is enabled on the modem port the serial port an XOFF character received over the communication lines causes the modem port to stop transmitting data from the modem buffer to the communication lines If the local device attached to the serial port continuously sends data
69. rectional DTR DSR hardware flow control AT amp K8 Enables unidirectional DTR DSR hardware flow control This command controls the type of flow control between the modem and the serial port of the computer or terminal When the modem connects to the remote modem using normal mode or error correction mode the data flow between the modem and the serial port should be controlled by flow control to avoid data loss If the modem connects to remote modem using direct mode this command will be ignored Please refer to Chapter 3 for 4 13 detail of flow control AT amp Ln Telephone Line Type Select Command AT amp LO AT amp LI AT amp L2 Disables leased line operation enables PSTN operation Default Enables 2 wire leased line operation disables PSTN operation Enables 4 wire leased line operation disables PSTN operation AT amp Mn Asynchronous Synchronous Mode Selection This command determines the asynchronous or synchronous operating mode The modem treats the amp M command as subset of the amp Q command AT amp MO AT amp MI AT amp M2 time second AT amp M3 while handshake the front Selects direct asynchronous operation Default Selects synchronous data mode with Async off line command mode Selects synchronous data mode with Async off line command mode Same as amp M1 except that amp M2 enables DTR dialing of stored telephone number at location 0 The modem will disconnect if DTR is O
70. remote modem while in connect state during non error corrected connection Purge buffers immediately send break to DTE Purge buffers immediately send break to DTE Immediately send break to DTE Immediately send break to DTE Same as 0 Send break to remote Send break to DTE modem with data in sequence with 4 20 data Send break to remote Send break to remote Send break to DTE Default modem in sequence modem with data in sequence with with transmitted data data AT Nn Operating Mode This command controls the preferred error correcting mode to be negotiated in a subsequent data connection This command has the similar function with the S register 36 and 48 and AT amp Qn command Changing this command will affect these registers and command s content AT NO correction ATINI ATIN2 first connection the modem ATIN3 ATIN4 ATINS MNP hanging up selects normal speed buffered mode disables error mode Selects direct mode and is equivalent to MO SOU mode of operation Forces amp Q0 Selects reliable error correction mode The modem will attempt a LAP M connection and then an MNP Failure to make a reliable connection results in hanging up Forces amp Q5 S36 4 and S48 7 Selects auto reliable mode This operates the same as N2 except failure to make a reliable connection results in the modem falling back to the speed buffered normal mode Forces amp Q5 S36 7 and S48 7 Default
71. ress amp T4 Bit 4 RDL requested 0 RDL not requested Default 1 RDL requested amp T6 Bit 5 RDL with self test 0 Disabled Default 1 Enabled amp T7 Bit 6 Local Analog Loop Back LAL with self test 0 Disabled Default 1 Enabled amp T8 Bit 7 Reserved S18 Test Timer Sets the length of time the modem conducts a diagnostic test S register 18 is available only when the modem is set to 1200bps or higher When S register 18 is set to 0 the modem will not end the test You must enter the AT amp TO command to end the test Range 0 255 seconds Default 0 S19 Bit Mapped Options Defines the options for AutoSync operation see amp Q4 command S register 19 must be set to the desired value before amp Q4 is issued Bit 0 Reserved Bit 1 BSC HDLC format selection 0 BSC selected Default 1 HDLC selected Bit 2 Address detection enable disable 0 Disabled Default 57 S20 Bit 3 Bit 4 Bits 5 7 1 Enabled NRZI NZI coding selection 0 NRZI selected Default 1 NZI selected Idle indicator select 0 Mark idle Default 1 Flag or Sync idle Reserved AutoSync HDLC Address or BSC Sync Character Defines the HDLC address S register 19 bit I 1 or BSC Sync Character S register 19 bit 1 0 for AutoSync operation see amp Q4 command S register 20 must be set to the desired value before amp Q4 is issued Range 0 255 Default 0 S21 Bit Mappe
72. rs at 4800bps used primarily to negotiate an MNP 10 connection on less than average quality telephone lines AT Kn MNP Extended Services Enables or disables conversion of a V 42 LAP M connection to an MNP 10 connection AT KO Disables V 42 LAP M to MNP 10 conversion Default AT K1 Enables V 42 LAP M to MNP 10 conversion AT K2 Enables V 42 LAP M to MNP 10 conversion inhibits MNP Extended Services initiation during V 42 LAP M answer modem detection phase AT On Enable Fallback to V 22bis V 22 Enables or disables fallback from MNP 10 to V 22bis V 22 4 28 AT Q0 Disables fallback to 2400 bps V 22bis and 1200 bps V 22 Fallback is enabled only to 4800 bps AT Q1 Enables fallback to 2400 bps V 22bis and 1200 bps V 22 Default When the modem is connected to V 34 the AT Q0 command cause the modem to fallback to V 34 2400bps the AT Q1 command cause the modem to fallback to V 22 1200bps ATO Mn Initial Cellular Power Level Setting Sets the initial transmit power level for upshift at connect until line conditions can be determined AT MO corresponds to 26dBm ATOM I corresponds to 30dBm AT M2 through AT M10 correspond to 10dBm and AT M11 through ATEM31 corespond to 11dBm to 31dBm respectively ATOMO 26 dBm Default ATOMI 30 dBm ATOM to AT M10 10 dBm AT MII 11 dBm AT MI12 12 dBm AT M30 30 dBm ATOM31 31 dBm AT En Compromise Equalizer Enable Command Enables or disables the V 32
73. s user to transmit or receive date at 28800bps The PROTOCOL LAP M means the modem has negotiated with the remote modem and established an ITU T V 42 connection The COMPRESSION V 42BIS indicates that the two modems are using ITU T V 42bis to do data compression Finally the CONNECT 115200 shows that the modem is using 115200bps to communicate with the DTE These result codes may or may not be shown on the terminal screen depending on the setting of the modem The modem supports three methods of automatic speed matching 1 Multi mode Handshake The multi mode handshake ATN1 follows the ITU T multi mode handshake recommendation which can provide full range of speed to connect to the other modem That means whatever speed protocol the modem is set to the modem can connect to BELL 103 212A and ITU T V 21 V 22 V 23 V 22bis V 32 V 32bis V 34 without changing speed This feature is convenience for the user to connect to an unknown modem 32 2 ITU T V 8 Multi mode Handshake The modem supports ITU T V 8 multi mode handshake The V 8 will cause the answering modem to send a ANSam signal and if the originate modem is capable of V 8 it response with CM After that both modems will begin a protocol handshake to determine modulation method error correction protocol and whether using celluar connection When all the condition is cleared both modem begin the preselected ITU T handshake This procedure makes the modems connect f
74. t command performs the following 1 Disconnects the telephone line 2 Performs self test diagnostics 3 Clears the modem and serial port buffer 4 11 4 Restores the profiles that stored in NVRAM 5 Reads configuration switches 6 Enters the command mode The ATZ command can also select the profile 0 or 1 to recall Key in ATZ or ATZO will cause the modem to recall profile 0 ATZ1 will cause the modem to recall profile 1 The Escape Code The Escape Code returns the modem to the command state from the online state without releasing the telephone line This command consists of an escape guard time defined by S register 12 default I second and an escape character ASCII code of which is specified in S register 2 default The escape character must be entered three consecutive times with a guard time before and after the three characters The modem returns to the local command state and sends the result code OK without releasing the telephone line connections Also see the ATOn and AT amp D1 commands AT amp Cn Serial Port CD Control AT amp CO Sets CD always ON AT amp Cl Sets CD to follow the state of carrier Default AT amp C2 Sets CD ON except during disconnect 3 5 sec Controls the CD signal of the serial port Use this command to achieve special effects to meet the need of central site computers AT amp Dn Serial Port DTR Control AT amp DO Assumes DTR ON AT amp DI Enters co
75. ted during tone dialing Range 50 255 milliseconds Default 95 95 milliseconds S12 Escape Code Guard Time Sets the time delay which must be present before and after entering the three characters escape code sequence Set this guard time to zero will disable the escape feature Range 0 255 1 50 of a second Default 50 1 second S14 Bit Mapped Options Status Indicates the status of command options Bit 0 Reserved Bit 1 Command echo En 0 Disabled E0 1 Enabled E1 Default Bit 2 Quiet mode Qn 0 Sends result codes QO Default 1 Does not send result codes Q1 Bit 3 Result codes Vn 0 Digit VO 1 Verbose V1 Default Bit 4 Keyboard Interrupt command Kn 0 Enables keyboard interrupt KO Default 1 Disables keyboard interrupt K1 Bit 5 Tone T Pulse P 0 Tone T Default 1 Pulse P Bit 6 Trellis Coding Modulation selection amp Un O Enables trellis coding modulation amp U0 Default 1 Disables trellis coding modulation amp U1 Bit 7 Originate Answer 0 Answer 1 Originate Default 5 6 S16 Bit Mapped Test Options Status Indicates the test in progress status Bit 0 Local Analog Loop Back 0 Disabled Default 1 Enabled amp T1 Bit 1 Reserved Bit 2 Local Digital Loop Back 0 Disabled Default 1 Enabled amp T3 Bit 3 Remote Digital Loop Back RDL status 0 Modem not in RDL amp T5 Default 1 RDL in prog
76. ter the connect state after exchanging carrier with the remote modem If no carrier is detected within the period specified in S register 7 the modem hangs up Any character entered during the connect sequence will abort the connection attempt ATA Repeat Last Command There is no need to type lt Return gt after the has typed the modem executes the last executed command immediately ATBn Select ITU T BELL Mode When the modem is configured to line speed of 300 or 1200 bps the modem will select BELL or ITU T modulation according to the parameter supplied Any other line speed will use an ITU T modulation recommendation ATBO Selects ITU T recommendation at 300 or 1200 bps during call establishment and a subsequent connection Default ATB1 Selects BELL standard at 300 or 1200 bps during call establishment and a subsequent connection ATDn Dial This command directs the modem to go off hook dial according to the string n entered and attempt to establish a connection in originate mode If no dial string is supplied the modem will go off hook and attempt the handshake in originate mode The modem will have up to the period of time specified by S register 7 to wait for carrier and complete the handshake If this time expires before the modem can complete the handshake the modem will go on hook with the NO CARRIER response This command will be aborted in progress upon receipt of any DTE character befor
77. the buffer eventually fills When this happens the modem sends an Xorr character from the serial port to instruct the local device to stop transmitting data In effect the local device will stop send data and will only restart sending when it receives an Xon message from the remote system Hardware Flow Control The modem supports two types of hardware flow control the unidirectional and the bi directional hardware flow control The unidirectional hardware flow control is similar to the Xon XoFF unidirectional software flow control It accomplishes flow control by turning ON and OFF of CTS Clear to send signal When the CTS signal is turned OFF the local device will cease to send data to the serial port of the modem data transmission will only be resumed when the CTS signal is turned ON Bi directional flow control uses both the CTS Clear to Send and the RTS Request to Send The RTS signal works in the same manner as the 3 4 CTS signal 1 e the modem stops sending data to the serial port of the local device when the RTS signal is turned OFF and resumes sending data only when RTS signal is turned ON For most of the applications the unidirectional hardware flow control is sufficient Examples of these applications are systems primarily involved in downloading files For applications that need to support file uploading and do not support Xon Xorr flow control bi directional hardware flow control is recommended so that the local de
78. the connection speed However the maximum modem to modem throughput continues to be equal to the connection rate For instance 1f the DTE is set to 115200bps and the modem connects at 28800bps CARRIER 28800 then as long as the DTE does not overflow the transmit buffer data will pass intact and the terminal speed must remain at 115200bps Throughput will not exceed 28800bps Since it 1s difficult to ensure that the DTE will not overflow the transmit buffer two methods are provided to indicate to the DTE whether it can send data to the modem or not These two methods are hardware flow control and software flow control When hardware flow control is enabled the RS 232 control line CTS is controlled by the modem it indicates to the DTE whether it can send data or not When software flow control is enabled the modem sends control characters Xon Xorr to the DTE to do flow control Conversely the DTE may also indicate to the moderny s ability to receive data by RTS an RS 232 control line in hardware flow control or by Xon Xorr software flow control characters Error Correction Mode The modem support ITU T V 42 error correction protocol When configured to V 42 the modem looks for incoming protocol of V 42 from the remote modem and try to establish an error correction connection The modem will provide data buffer so that the terminal speed may be different from the connection speed It also provides error detection and error correction F
79. uring handshake This command controls the keyboard interrupt function After the modem enters the waiting for handshake state if any character coming from the terminal to the modem before the handshake has finished the modem will drop the telephone line and return the NO CARRIER result code If your system will send characters during the handshake sequence please use this command to disable the keyboard interrupt This command controls only in AT command mode If you set the modem to power on operation V 25bis or dumb mode the modem will ignore AT Kn command and act as disable keyboard interrupt AT Rn Serial Port RTS Option AT RO Ignore RTS signal Default AT RI RTS action follows RS 232 definition 4 23 This command controls the RTS option of the serial port You can select the options according to the requirement of DTE AT MS Select Modulation This extended format command selects the modulation optionally enables or disables automode and optionally specifies the lowest and highest connection rates using one to four subparameters The command format is AT MS lt mod gt lt automode gt lt min_rate gt lt max_rate gt lt ENTER gt Notes 1 For 14400 bps and lower speeds the ATNn command and S register 37 can alternatively be used in which case the AT Ms sub parameters will be modified to reflect the ATNn and S37 x setting Use of the ATNn and S37 x commands is not recommended but it is prov
80. use the remote modem to perform digital loopback test Digital Loopback Sets the switch AL and RL to PUSH position in the same time when connected with another modem will cause the modem to perform the digital loopback test Test Pattern When the modem is performing self test this switch selects whether to send test pattern automatically or not If it is set to PUSH position the modem will send test pattern automatically when entering self test If you want to stop sending just released this switch to POP position Modem Rear Panel 2 4 Standalone Modem Rear Panel 2 0A ON SE oC Dol SG MATE LA LB E DTE FG RxARxB PA PB 381 OFF AC 110 220 Figure 2 3 Standalone Modem Rear Panel The standalone modem s rear panel has one power switch one fuse holder one power cable one serial port RS 232C one RJ 45 connector and one terminal block for wiring see Figure 2 3 The following sections detailedly describe the functions of each part Power Switch The power switch controls the whole power of the modem Turn the switch to OFF position will turn off the modem Power Cable The power cable is for the user to plug into the wall outlet of the AC power source The modem uses AC 110V or 220V as input rating Please contact your dealer for power rating Fuse This fuse holder contains a f
81. use of 2 0A 250VAC The user should NOT change this fuse with different specification RS 232C Serial Port The serial port is a female DB25 connector for the RS 232 cable This connects your modem to your local computer or terminal RJ 45 Connector This jack is for the user to connect the telephone line and telephone set There are 8 connector pins inside this jack the detail description about these pins from right to left are listed below 2 5 Figure 2 4 RJ 45 Connector 1 2 LA and LB Connect the PSTN telephone line to these two pins Use these two pins to do dialing and answering the PSTN telephone system You can also use these two pins to do dial back up function 3 4 PA and PB Connect the telephone set to these two pins You can use the telephone set to dial telephone number and talk to the other end or do manual dialing function using these two pins 5 6 TXA and TXB These two pins perform two functions The first is the transmit and receive pair of the 2 wire leased line operation And the second is the transmit pair of the 4 wire leased line operation 7 8 RXA and RXB Connect the 4 wire leased line s receiving pair to these two pins This connector is identical to the terminal block below Terminal Block There is a terminal block on the rear panel it contains 10 terminals which can be wired to 4 wire leased line or 2 wire leased line 2 wire dialup line telephone set signal groun
82. vice can also control the flow of data from the modem The modem also supports hardware flow control using DTR Data Terminal Ready and DSR Data Set Ready signal in the RS 232 The DTR signal works in the same manner with the RTS signal and the DSR signal works in the same manner with the CTS signal when setting the modem to do DTR DSR hardware flow control The Modem Operating Mode The modem operating mode determines how the modem communicates with the remote modem The modem operating modes are direct mode normal mode and error correction mode These modes are described bellow Direct Mode A direct mode connection is equivalent to any standard 28800bps modem connection In a direct mode connection the maximum throughput is equal to the connection rate and the terminal DTE rate must always match the connection rate For instance if the DTE is set to 28800bps CARRIER 28800 the throughput will not exceed 28800bps On the other hand if the DTE is set to 28800bps and the modem falls back to a 9600bps connection CARRIER 9600 the terminal must be adjusted to operate at 9600bps and the throughput will never exceed 9600bps The flow control AT amp K command is ignored when the modem is set to direct mode The serial port speed is always adjusted to the connection speed of the modem port Normal Mode 3 5 In a Normal mode connection the modem provides data buffers This allows the terminal speed to be different from

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