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- July 25, 1994
-
- The complexity of modems today is such that great care must be taken in
- setting up the 'initialization string. This string is what connects the
- modem to the outside world, and how it will react.
-
- My intention is to take some of the frustration out of setting up a modem
- for optimal use. As many modems come merely with a single sheet on how to
- install it into your computer, this text will aid you in getting the most
- out of your communications package.
-
- Jim Dickson
- Mississauga, Ontario
- Internet RN1020@ROSE.COM
-
-
- ***************************************************************************
-
-
- MODEM COMMANDS
-
- Command Function
-
- A manually answer incoming call
-
- A/ repeat last command executed. Do not precede A/ with AT or follow
- with ENTER.
-
- AT appear at the beginning of every command line
-
- B_ B0 = CCITT V.22/V.22bis compatibility
- B1 = Bell 103/212A compatibility
-
- D_ 0 throu*gh 9
- # and *
- P (pulse dialing)
- R (include at end of Dial command line to call originate-only
- modem).
- T (touch-tone dialing)
- W (wait for second dial tone)
- @ (wait for one or more rings, followed by 5 seconds of silence.
- , (pause)
- ! (flash)
- ; (return to Command Mode after dialing)
-
- DS=n dials 1 of 4 telephone numbers (n) stored in the modem's
- nonvolatile memory
-
- E_ E0 = commands are not echoed
- E1 = commands are echoed
-
- +++ switch from Data Mode to Command Mode; pause 1 second before
- typing; do not follow with carriage return (see Registers S2
- and S12.
-
- H_ H0 = modem is on-hook (hung up)
- H1 = modem is off-hook, line and auxiliary relay
-
- I_ I0 = display product identification code
- I1 = factory test
- I2 = internal memory test
-
- L_ L1 = low speaker volume
- L2 = medium speaker volume
- L3 = loud speaker volume
-
- M_ M0 = internal speaker off
- M1 = internal speaker off until carrier detected
- M2 = internal speaker always on
- M3 = speaker on until carrier detected and off while dialing
-
- O_ O0 = return to data mode
- O1 = modem does not send responses
-
- Sr? read value in register r (r = 0-27)
-
- Sr=n set register r to value n (r = 0-27; n = 0-255)
-
- V_ V0 = single digit response
- V1 = word responses
-
- X_ X0 = Hayes Smartmodem 300 compatibility
- X1 = include CONNECT 1200 and CONNECT 2400 responses
- X2 = include dial tone detection responses
- X3 = include busy signal detection responses
- X4 = include both dial tone and busy signal detection responses
-
- Y_ Y0 = modem does not send or respond to break signals
- Y1 = modem sends break signal for 4 seconds before discontinuing
-
- Z_ Z0 = retrieves active configuration profile from stored
- configuration profile 0 and performs 2 sec. modem self test
- Z1 = retrieves active modem configuration profile from stores
- configuration profile 1
-
- &C_ &C0 = keep carrier detect signal always ON
- &C1 = turn on carrier detect signal when remote carrier signal is
- present
-
- &D_ &D0 = modem ignores the Data Terminal Ready signal
- &D1 = modem returns to command mode and asynchronous operation
- following an ON to OFF DTR transition
- &D2 = modem hangs up, returns to the command mode, and prepares
- for asynchronous operation following and ON to OFF DTR
- transition
- &D3 = modem resets following an ON to OFF DTR transition
-
- &F restores the modem to the default operating characteristics
-
- &G_ &G0 = guard tone disabled
- &G1 = 550 Hz guard tone
- &G2 = 1800 Hz guard tone
-
- &J_ &J0 = modem will use an RJ11, RJ41S, or RJ45S telephone jack
- &J1 = modem will use an RJ12 or RJ13 telephone jack
-
- &L_ &L0 = modem is set up for dialup operation
- &L1 = modem is set up for leased-line operation
-
- &M_ &M0 = modem is configured for asynchronous operation
- &M1 = modem enters synchronous mode after dialing asynchronously
- &M2 = synchronous terminal support only
- &M3 = manually originating a synchronous call
-
- &P_ &P0 = United States setting for off-hook(make) to on hook(break)
- ratio
- &P1 = UK and Hong Kong setting for off-hook to on-hook ratio
-
- &R_ &R0 = modem turns on its Clear To Send signal when it detects the
- Request To Send signal from the attached computer or terminal
- &R1 = modem ignores the Request To Send signal and turns on its
- Clear To Send when ready to receive data synchronously
-
- &S_ &S0 = DSR remains on at all times
- &S1 = DSR operates according to RS-232C specifications
-
- &T_ &T0 = ends test in progress
- &T1 = performs local analog loopback test
- &T3 = performs local digital loopback test
- &T4 = modem achnowledges remote digital loopback test performed
- by a remote modem
- &T5 = modem ignores a remote modem's request for a remote digital
- loopback test
- &T6 = perform a remote digital loopback test
- &T7 = perform a remote digital loopback test and self test
- &T8 = perform a local analog loopback test and self test
-
- &V displays configuration profiles
-
- &W_ &W0 = stores the modem's active configuration profile in stored
- configuration profile 0
- &W1 = stores the modem's active configuration profile in stores
- configuration profile 1
-
- &X_ &X0 = modem provides synchronous clock on EIA pin 15
- &X1 = modem accepts an externally provided synchronous clock from
- the carrier detect signal being received and provides the
- clock on EIA pin 15
-
- &Y_ &Y0 = designates configuration profile 0 to be the default
- configuration profile. When modem is turned on or reset,
- configuration profile 0 will be retieved as the active
- configuration profile
-
- &Y1 = designayes configuration profile 1 to be the default
- configuration profile. When modem is turned on or reset,
- configuration profile
-
- &Zn stores up to 4 telephone numbers in the modem's non-volatile
- memory. Use DS=n to dial a number
-
-
- S-REGISTERS
-
- DEFAULT
-
-
- Register Range Value Function
-
- S0 0-255 rings 1 rings to auto-answer calls
-
- S1 0-255 rings 0 count number of incoming rings
-
- S2 0-127 ASCII 43 escape character
-
- S3 0-127 ASCII 13 carriage return character
-
- S4 0-127 ASCII 10 line feed character
-
- S5 0-32,127 ASCII 8 backspace character
-
- S6 0-255 seconds 2 dial tone wait time
-
- S7 1-255 seconds 30 wait time for remote carrier
-
- S8 1-255 14 delay time between loss of remote 1/10
- seconds carrier and hangup
-
- S9 1-255 6 carrier detect response time
- 1/10 seconds
-
- S10 1-255 14 delay time between loss of remote
- 1/10 seconds carrier and hangup
-
- S11 50-255 95 duration and spacing of touch tones
- milliseconds
-
- S12 0-255 50 escape characters guard time
- 1/50 seconds
-
- S13 undefined
-
- S14 bitmapped echo, response, dialing and register
- originate/answer register
-
- S15 undefined
-
- S16 0, 1, 2, 4 0 modem tests
-
- S17 undefined
-
- S18 0-255 seconds 0 length of modem tests
-
- S19 undefined
-
- S20 undefined
-
- S21 bit-mapped jack, clear to send & data terminal register
- ready signals, and long space disconnect
-
- S22 bit-mapped speaker and response register
- register
-
- S23 bit-mapped 7 remote digital loopback request, data
- register rate, parity and guard tone
- register
-
- S24 not used
-
- S25 0-255 5 data terminal ready delay 1/100 seconds
-
- S26 0-255 seconds 1 request-to-send-to-clear to 1/100 seconds
- send delay fpr half-duplex operation
-
- S27 bit-mapped async/sync operation and line register
-
-
-
- MODEM RESPONSES
-
-
-
- Word Number
- Responses Responses
- (V1 command) (V0 command) Meaning
-
- OK 0 modem successfully executed a command.
- Modem has switched from data mode to
- command mode
-
- CONNECT 1 data connection made with remote modem
- at any baud rate
-
- RING 2 modem has detected an incoming ring.
- Modem will only answer when given the
- A command, or when S0 is greater than 0
-
-
- NO CARRIER 3 remote carrier signal lost or not detected
- within the time specified by S7; modem
- returns to command mode.
-
- ERROR 4 modem found an error in your command line,
- and returns to command mode
-
- CONNECT 1200 5 modem has made a data connection at
- 1200 bps
-
- NO DIALTONE 6 with the W command, waits up to W
- command time; modem begins dialing
- as soon as dial tone is detected.
-
- when blind dialing, modem waits the S6
- register time, then dials, regardless
- of whenther dial tone is detected
-
- BUSY 7 modem has detected a busy signal after
- dialing automatically
-
- NO ANSWER 8 you sent the Wait for Quiet Answer
- (@) command and the modem did not
- detect 5 secons silence
-
- CONNECT 2400 10 modem has made a data connection at
- 2400 bps
-