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4.4

SNM15

Use of the Modem

Digicom SpA

AT COMMANDS

The AT command set has become a de facto industry standard for
commanding low, medium and high speed asynchronous modems.
The SNM 15 modem’s extended AT command set is fully
compatible with the original AT command set, but in addition, it
contains command for error control, speed conversion and
stored numbers for auto-dialling.

There are two basic modes of operation for SNM 15:

COMMAND

mode

and

DATA mode

.

COMMAND mode

is when the

modem is not connected to another modem, that is “off-line” or
idle condition. In this mode the modem will accept commands
beginning with the AT prefix.

DATA mode

is when the modem

is connected to another modem, that is “on - line” condition or
operative. While in this condition all the characters sent from
DTE are interpreted as data and they are sent to the remote mode.
You may switch from data to command mode by entering an
escape sequence. The default escape sequence is +++ (see
Register S12) which must have a period of one second before and
after its being keyed, where no other characters are sent to the
modem. To go back into data mode simply type

ATO<CR>

.

The AT commands fall into three categories:

1.

”AT”

or

“at”

+ <command body> + <CR>

Most AT commands belong to this category. This command can
be divided into three additional sub-categories:

«
...
24
25
26
27
28
...
»

Содержание SNM15

Страница 1: ...SNM15 OPERATION MANUAL SNM15 rev 1 0 del 07 91 COD 7D0548...

Страница 2: ...ctronic otherwise without the prior written permission of the publishers The contents of this booklet may be modified without prior permission Every possible care has been taken in testing and putting...

Страница 3: ...42bis 2 6 INSTALLATION 3 1 introduction 3 1 Connection to the DTE Data Terminal 3 1 Connecting to the Telephone Line and Telephone 3 1 Operational Test 3 3 USE OF THE MODEM 4 1 introduction 4 1 Contr...

Страница 4: ...uration of S Registers from AT to V 25bis 6 23 DIAGNOSTICS 7 1 Introduction 7 1 Enabling Remote Loop 2 7 1 Disabling Remote Loop 2 7 2 Enabling Loop 3 7 2 Disabling Loop 3 7 3 Resetting the Hardware 7...

Страница 5: ...uits theoperationalconditionofthemodemandtheoperation and test enabling switches On the rear panel there are the power supply cord the protection fuses and the mains switch There are also the line con...

Страница 6: ...T Theformercanbeusedindifferentlyfor programming the modem and transmitting data to a remote modem the latter can only be used to program the modem Communication procedure asynchronous Start Stop seri...

Страница 7: ...be transferred from the DTE to the DCE and vice versa Operational mode Inordertoprogramandenablethe connection the format is start stop asynchronous whereas data can be transmitted in either asynchron...

Страница 8: ...SG Signal ground 8 109 CF DCD Data carrier detect 9 12 V test voltage 10 12 V test voltage 11 12 13 14 15 114 DB TC Internal transmission clock 16 17 115 DD RC Reception clock 18 141 CN L3 Request for...

Страница 9: ...o accepts an external timer external clock supplied on circuit C113 of the interface provided that it has the tolerance levels envisaged by the CCITT Received Data Clock in synchronous mode the modem...

Страница 10: ...wer C125 RI delay 500 ms 100 ms compared to the initialcallvoltage Answer tone 2100 Hz 1 Hz of the duration of 3 3 sec 1 ms Automaticdisconnection within 30 seconds per failure to synchronize with the...

Страница 11: ...nsplayed bythesedevicesarealreadypresentintheformofcommandsand communication protocol messages They are particularly useful in the case of manual calls or loop tests for the switches Controls on the F...

Страница 12: ...1 8 SNM15 Introduction Digicom SpA Controls on the Rear Panel ON OFF power supply switch on off PWR C108 C107 C103 C104 C109 C142 LINE Front view of SNM 15 Rear view of SNM 15...

Страница 13: ...rogrammed values the modem will be initialized with the default values and then go into the AT environment TheV 25bisisenabledbythecommand AT Vn seecommand V With parameter n you select the control of...

Страница 14: ...ol seecommand U infact ifthefeaturesofthelinewhen being connected become worse the modem will be forced to retransmit many blocks several times This might lead to the saturation of modem buffer especi...

Страница 15: ...es of the MNP supported by the SNM 15 modem we will give a brief informative summary of the 5 levels defined by this protocol MNP CLASS 1 Asynchronous error correction protocol half duplex or byte ori...

Страница 16: ...he length of the packets from 1 to 256 characters in dynamic mode Ifthedatachannelhasrelativelyfewerrors theMNPwill automatically increase the length of the packets thus obtaining greater efficiency a...

Страница 17: ...g function Obviously the choice of the level exclusively depends on the features of the modem and occurs AUTOMATICALLY see column E 4 or 5 when it is connected by establishing the maximum common level...

Страница 18: ...TT V 42 and V 42bis V 42 and V 42bis are standard error correction and data compression tecniques stated by CCITT V 42bis allows to have a more efficient data compression respect MNP5 infact the line...

Страница 19: ...sed with the modem are given in the introduction Please remember that the V 28 standard recommends that the interface cables must be no longer than 15 m The interface connector is a standardized 25 co...

Страница 20: ...3 2 SNM15 Installation Digicom SpA INSTALLATION OF THE SNM 15 COMMAND PORT MAIN PORT RJ11 TO DTE DTE telephon plug RJ11 SNM15 RJ11...

Страница 21: ...C107 DSR and C109 DCD should light up the modem will in fact be programmed accordingtoitsdefaultvaluethatenvisesthecriteriaDCDand DSR forced to operate Check out whether the telephone line is correctl...

Страница 22: ...the display and LED lamp C142willlightuponthemodem Thesamethingcanbedone by keying in the command AT T1 from the terminal Press the push button TEST again to disable the loop or key in the ESCAPE seq...

Страница 23: ...in standby the key is out Control Devices on the Front Panel DATA Voice dataswitching Whenthisunstablepush button is pressed will cause the modem to be connected to thetelephoneline inANSorORGmode see...

Страница 24: ...ysettocallandtoanswer typicallyin unattended automatic systems In leased or manual connections on of the two modems should be preset to call and the other to answer TEST Enabling the analogical and di...

Страница 25: ...a red LED lamp ON indicates that there is data on the interface circuit C104 received data therefore the flashing of C104 LED indicates that siifant data are being received C109 Data Carrier Detect re...

Страница 26: ...In this mode the modem will accept commands beginning with the AT prefix DATA mode is when the modem is connected to another modem that is on line condition or operative While in this condition all th...

Страница 27: ...hiscommandisknownastheescapesequenceandisusedwhen the modem is in data mode and you want to put it into command mode The ATO command will return the modem to data mode Command Buffer The AT command bu...

Страница 28: ...eds of 300 1200 2400 bits per second The modem has the ability to perform interface speed up to 9600 bps See I command for details The modem will accept even odd mark space and no parity Data length E...

Страница 29: ...n line H Connection disconnection from the line I Modem ID L Loudspeaker volume M Loudspeaker control Nn Zxx Stores telephone number O Online Q Quiet mode Sx Sets register x Sx Reads register x V Verb...

Страница 30: ...Command port B Displays Black List numbers C Displaysconfiguration D Asynchronous C108 1 mode E Data compression H CTS handling in asynchronous mode I Adaptive rate control M CCONF interface signal S...

Страница 31: ...preceded by the Attention Code AT nor is followed by a carriage return ATA This command causes the modem to go off hook immediately answeranincomingtelephonecallandbegintheanswersequence ATD Thiscomm...

Страница 32: ...standard 1200 bps full duplex F5 V 22bis standard 2400 bps full duplex ATH This command controls the telephone switch hook causing the modemtogoimmediatelyon hookandterminateacallconnection H0 Disconn...

Страница 33: ...f M1 Loudspeaker on until the carrier is detected M2 Loudspeaker always on ATNn Zxx This command allows the writing in one of the twenty locations ofmemoryavailable n is one of the 20 locations availa...

Страница 34: ...themodemconfiguration parameters stored in the S Registers Sr xx Where r is the register number and xx is the value to be written in the register ATSr This command displays the value of the S Register...

Страница 35: ...one absent 7 BUSY lineengaged 8 NO ANSWER no answer 10 CONNECT 2400 connected at 2400 bps 12 RDL GRANTED digital loop on 13 RDL DENIED digital loop off 15 aborted aborted message 20 BUF active BUFFER...

Страница 36: ...one ATY This command enables or disables the disconnection with the BREAK character if the modem is receiving a BREAK signal from the remote modem for a period longer than 1 5 sec it will be disconnec...

Страница 37: ...t has been implemented for use of modem when a transition to OFF of DCD C109 is necessary in order to close the communication port and viceversa C109 is necessary to open the communication port and to...

Страница 38: ...nous data transmission is protected against any errors entered by the transmitting support Both modems provided with an error correction take care of codingthedatatobetransmittedtoensurethatthecorresp...

Страница 39: ...LAPM corrector enabled in reliable mode If at the end of the negotiation it does not find the corrector on the remote modem the connection is dropped E4 MNP enabled in autoreliable mode If at the end...

Страница 40: ...f data SNM 15 can reconstruct the parity of the received data This function I3 allows the dialog between two DTEs which use different parities ex 7 EVEN and 7 ODD The modem analyses and reconstructs t...

Страница 41: ...tion of this criterion causes the modem to be disconnected M2 The modem dials the number stored in memory location N0 when DTR is raised communication is synchronous The modem hangs up the call and re...

Страница 42: ...andC106 see register S26 This command is only valid for synchronous operation R0 C106 follows C105 R1 The modem ignores C105 106 is fixed ON R2 C106 is fixed at ON AT S This command enables or disable...

Страница 43: ...S49 and S50 registers U0 flow control disabled U1 software flow control enabled with XON OFF characters U2 software flow control enabled with XON OFF characters These characters are transferred to the...

Страница 44: ...rceofthesynchronoustransmission clock at the DTE interface when the modem is in data mode synchronous mode only X0 Internal clock supplied by the modem X1 External clock supplied by the DTE AT Y This...

Страница 45: ...MAND MAIN COMMAND N A USE OF THE SNM 15 PORTS N A NOT AVAILABLE the modem can be disconnected by C108handling AT B Displays the numbers in the black list B0 displays the delayed and forbidden numbers...

Страница 46: ...s lowered D0 asynchronous C108 1 disabled D2 asynchronous C108 1 enabled COMMAND E This command controls the integral data compression feature of the modem during error control connections Infact besi...

Страница 47: ...selected Speedat9600bpscanalsobeselectedthroughasoftwareswitch if 1 7 dip switch is at ON at the power on the modem is ready to work at 9600 bps same as I7 command I0 Autobaud enabled from 300 to 240...

Страница 48: ...of the S registers AT T This command disables the answer tone when the originate modem does not control it When answer tone is disabled it is necessary to force the modulation standard F command The...

Страница 49: ...tly interpreted you need to take into account the following conditions do not transmit any characters for the time determined by register S12 The default value is one second key in the ESCAPE code in...

Страница 50: ...The P modifier instructs the modem to pulse dial a telephone number The T modifier instructs the modem to dial subsequent digits of a Tn in tone mode To dial 0331263122 number send the following stri...

Страница 51: ...s not detected the call will be aborted and the message NO DIAL TONE will be displayed ATD This command instructs the modem to pause during dialling for the number of seconds set by the value of S8 re...

Страница 52: ...ANSWER 0 COMMAND ANSWER ENABLED V MESSAGES 1 MESSAGES IN EXTENDED FORM X MESSAGE EXT 1 RESULT CODE ENABLED CONNECTnnnn Y BREAK 0 DISCONNECTION FOR BREAK DETECTION DISABLED C DCD DSR CONTROL 0 DCD DSR...

Страница 53: ...IEDBYTHEMODEM Y PORT POSITION 0 MAIN PORT D ASYNCH C108 1 0 DISABLED E DATA COMPRESS 1 ENABLED V 42BIS MNP CLASS 5 I DTE SPEED 0 BY AUTOBAUD H CTS IN ASYNC 1 CTS NORMAL M CCONF OPTION 0 DISABLED T ANS...

Страница 54: ...em compatiblewithhostsoftwarealreadywrittenfordial upmodems For synchronous applications the protocol format is HDLC with ASCII NRZ code Duties of the DTE During the call stage the DTE has to Make sur...

Страница 55: ...part of the V 25bis auto call procedure Parameter Thisisavariablethatcanaccompanycommandsandindications Address Thisisatwofigureprogrammablevariableindicatingtheposition in which a telephone number is...

Страница 56: ...made Fromthispointon ifeventheninthcallwereunsuccessful itwill be no longer possible to call the number in question until the 120 minute timer associated to it has run out FORBIDDEN state Only once th...

Страница 57: ...ossibletocallnewnumbersuntilanewposition has been vacated in the Black List This guarantees that any other unsuccessful phone calls may be inserted into the Black List with all the envisaged limitatio...

Страница 58: ...maximum of 9 will be made with a delay time of 2 minutes since the end of the previous attempt Forbidden Call If the telephone number has been called unsuccessfullyforaminimumofattemptsequalto9 itwill...

Страница 59: ...ndTindicatethestateparametersgiven above e g RDNO2 From DTE LSNO2 064745871 D25000 from DCE InthiscasetheinformationoftheDCEwillconfirmthatnumbers correspondingtoarea02inthememoryis064745871 ithasbeen...

Страница 60: ...7databitsandEVENparity Itshouldthusbenoted thattheoperationsalwaystakeplacewitha10start stopcharacter format Every command must be followed by Carriage Return and Line Feed characters The commands to...

Страница 61: ...EST FOR CALL WITH A TELEPHONE NUMBER STORED IN THE DCE It is the equivalent of the previous request withthedifferencethatthenumber is already present in the DCE memory The command is always accompanie...

Страница 62: ...restoindicatetheposition in the memory of one specific number to be examined RLF RLF REQUEST FOR THE LIST OF FORBIDDENNUMBERS Upon request the DCE will supply the address thetelephonenumberand thestat...

Страница 63: ...heprevious onethatallowstheDCEtoconnect the incoming call previously ignored The DCE must get the CIC command within 10 sec of receiving DIC CLA CLAXX ADDRESS CANCELLATION This command allows the DTE...

Страница 64: ...state is stored in the non volatile configuration EOF EOF ECHO OFF Faced with this command the DTE will not echo anycommandsthatitreceivesfrom the DTE The new echo state is stored in the non volatile...

Страница 65: ...n allocated to the separators Separator No 2 2 second pause indication Separator No 3 5 second pause indication Separator No 4 10 second pause indication Separator wait tone wait for dialing tone The...

Страница 66: ...e DCE to inform the DTE that the call was successfulandthattheconnection has been established OFL OFL OFF LINE INDICATION This indication allows the DCE to inform the DTE that the disconnectionhasbeen...

Страница 67: ...and CTS LSN LSNXX YY Y LIST OF STORED NUMBERS InreplytoaRLNZSPTcommand of the DTE The first two commands are meant to indicate the position in the memory followedbythetelephonenumber and the state of...

Страница 68: ...n indication CFI CALL STAGE CB This parameters is meant to inform the DTE that the DCE is not available for the call it is being tested is in loop or it is performing other functions incompatible with...

Страница 69: ...answer tone from the remote DCE test on 60 5 sec ET The call is hung up because an occupied tone of the dialed number is detected test on 40 5 sec AB Giventheabsenceofchecks handshakenotestablishedby...

Страница 70: ...r an X period DIC VAL INC Incoming calls not accepted CIC VAL INC Incoming calls accepted CIC INV Command not accepted becauseitwasgivenmore than 10 sec after DIC PRNXX Y Y VAL Storing of the telephon...

Страница 71: ...ach commandthatitgetsfrom the DTE EOF VAL The DCE will not echo anycommandthatitfrom the DTE CSP 300 VAL Speedbroughtto300bps after the warning VAL CSP 1200 VAL Speed brought to 1200 bps after the war...

Страница 72: ...SDLC and it corresponds to 7E in hexadecimal or to 01111110 in bynary A Address Thisisusuallyachangingfieldbutin this case it has a fixed value and it must be FF hex or 11111111 binary C Control This...

Страница 73: ...ONOUS V 25BIS COMMANDS COMMAND FORMAT DESCRIPTION CRN CRNXX XX REQUEST FOR CALL WITH TELEPHONE NUMBER SUPPLIEDBYDTE Itissentfrom the DTE to start up the procedure The command is always accompanied by...

Страница 74: ...separated by the number to be stored with the symbol SYNCHRONOUS V 25BIS INDICATIONS INDICAT FORMAT DESCRIPTION INV INV INVALID COMMAND The DCE warns the DTE that is not able to perform the command it...

Страница 75: ...he commands from AT to V 25bis COMMAND DESCRIPTION V 25bis default E ECHO 1 ECHOENABLED P M F STANDARD 0 MULTISTANDARD I L ALARM 2 MEDIUMLOUDSPEAKERVOLUME P M LOUDSPEAKER 1 SPEAKERONUNTILCARRIER ISDET...

Страница 76: ...NSWERTONEENABLED 0F X CLOCKCONTROL 0 SUPPLIEDBYTHECONNECTION P F Fixed the value assumed in V 25bis is independent from and fixed by the value set in Hayes P Passing thesettingsetinHayesisalsomaintain...

Страница 77: ...ONDS 02 Waiting time for dial tone I S7 1 255 SECONDS 30 Waiting time for carrier I S8 0 255 SECONDS 02 Pause time for I S9 1 255 1 10 s 06 Answer tone detection time 06 F S10 1 255 1 10 s 07 Disconne...

Страница 78: ...log loop is enabled loop3 T6 Sends a request for a remote digital loop loop 2 N B The loop functions are only active for connections without MNP or buffers Enabling Remote Loop 2 This loop can be enab...

Страница 79: ...2 Enabling Loop 3 ToenableLoop3 themodemmustbeOFFLINE thenkeyinthe command AT T1 or press the TEST push button on the front of the modem after a few seconds the modem will answer with the message CON...

Страница 80: ...werswith OK keyin AT T0orpress the TEST push button on the front panel of the modem N B The modems must be set OFF LINE Representation of Local Loop 3 Resetting the Hardware It is possible to reset th...

Страница 81: ...tor RememberthattheinternalregistersMUSTNOTbemodifiedby the user in case of any possible malfunctioning of the unit The command S allows you to write or read the values contained in these registers Sr...

Страница 82: ...ecteds RING counter This register counts the number of rings that are detected by the modem in period of 8 seconds S2 Escape character Contains the character used to activate the ESCAPE sequence defau...

Страница 83: ...m If this time passes by without detecting the carrier the modem will display the message NO ANSWER The value is entered in seconds S8 Pause for character This determines the pause time needed to dete...

Страница 84: ...e watch time that comes before or after the ESCAPE charactersequence Thevalueisexpressedisfiftiethsofasecond S13 S14 S15 S16 S17 Internal registers 25 Delay for the DTR ON OFF Disconnection This deter...

Страница 85: ...character This register contains the decimal value of the fallback character used with error corrector applications The default value is 13 which corresponds to the Carriage Return character S49 S50...

Страница 86: ...S 02 Waiting time for dialing tone S7 1 255 SECONDS 30 Waiting time for the carrier S8 0 255 SECONDS 02 Pause time for characters S9 1 255 1 10 s 06 Answer tone detection time S10 1 255 1 10 s 07 Disc...

Страница 87: ...NCHRONOUS CONNECTION WITHOUT AUTO ANSWER FEATURE The default programming allows you to make a phone call in compliance with the V 21 V 22 or V 22bis standards without needing to set any parameters of...

Страница 88: ...2 modulation ATF4 1 AT E4 MNP enabled AT E4 auto answer enabled ATS0 2 2 AT E1 MNP option 5 enabled AT E1 AT W Stores the configuration AT W ATDn automatic call 1 This command is optional 2 The modem...

Страница 89: ...enable the synchronous emulation on the Main Port without causing the modem to be disconnected due to absence of C108 Obviouslyeverythingmustbedonewithinthetimesetonregister S25 usually 30 sec to stop...

Страница 90: ...ll from the Main Port Repeat the operations described above without sending the command to enable the COMMAND PORT Remember that the ESCAPE FUNCTION is no longer available with this configuration The...

Страница 91: ...F OFF 2 dBm OFF ON OFF OFF 3 dBm ON ON OFF OFF 4 dBm OFF OFF ON OFF 5 dBm ON OFF ON OFF 6 dBm OFF ON ON OFF 7 dBm ON ON ON OFF 8 dBm OFF OFF OFF ON 9 dBm ON OFF OFF ON 10 dBm OFF ON OFF ON 11 dBm ON O...

Страница 92: ...DS1 1 Reserved for future use DS1 2 Reserved for future use DS1 3 Reserved for future use DS1 4 Reserved for future use DS1 5 Reserved for future use DS1 6 Reserved for future use DS1 7 OFF interface...

Страница 93: ...A 3 SNM15 Dip Switches setting Digicom SpA Topographical view of SNM 15 1 JA1 DS2 DS1 4 3 2 1 8 7 6 5 4 3 2 1 JB1 U2 1 1 PWR C108 C107 C103 C104 C109 C142 LINE...

Страница 94: ...u consult the operating system manual To run the program you only need to key in RUN and to quit CTRL E 10 REM 20 REM Simpleterminalemulation 30 REM program for programming 40 REM the SNM 15 modem 50...

Страница 95: ...230 REM 1 2 3 4 5 240 OPEN com2 1200 e 7 1 rs cs ds cd AS 1 260 IF EOF 1 THEN 270 ELSE GOSUB 340 270 A INKEY IF A THEN GOTO 260 280 IF ASC A FINE THEN CLOSE SYSTEM 290 PRINT 1 300 GOTO 260 340 REM I...

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