Multi-Tech Systems MT5600SMI-L34 manual Registers, Wait Time for Carrier, Silence, or Dial Tone

Chapter 5 – AT Commands, S-Registers, and Result Codes

S-Registers

Certain modem values, or parameters, are stored in memory locations called S-registers. Use the S command to read or to alter the contents of S-registers (see previous section). * Register value may be stored on one of two user profiles with the command &W.

Register	Unit	Range	Default	Description
S0	1 ring	0–255	0	Number of Rings to Auto-Answer: Sets the number of rings until
				the modem answers. ATS0=0 disables autoanswer completely. *
S1	1 ring	0–255	0	Ring Counter: Counts the rings that have occurred. S1 is cleared if
				no rings occur over eight-second intervals.
S2	decimal	0–255	43 (+)	Escape Character: 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; e.g., no
				escape character will be recognized.*
S3	decimal	0–127	13 (^M)	Carriage Return Character: Sets the command line and result code
				terminator character. Pertains to asynchronous operation only.
S4	decimal	0–127	10 (^J)	Line Feed Character: 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 if
				verbose result codes are used.
S5	decimal	0–255	8 (^H)	Backspace Character : Sets the character recognized as a
				backspace. Pertains to asynchronous operation only. The modem will
				not recognize the Backspace character if it is set to a value that is
				greater than 32 ASCII. 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.
S6	seconds	2–255	2	Wait Time Before Blind Dialing or for Dial Tone: 1. Sets the length
				of time, in seconds, that the modem will wait before starting to dial
				after going off-hook when blind dialing. This operation, however, may
				be affected by some ATX options according to country restrictions.
				The “Wait for Dial Tone” call progress feature (W dial modifier in the
				dial string) will override the value in register S6. (When configured for
				US).
				2. Sets the length of time, in seconds, that the modem will wait for
				dial tone when encountering a “W” dial modifier before returning NO
				DIAL TONE result code. (W class). Default is country-dependent. The
				modem always pauses for a minimum of 2 seconds, even if the value
				of S6 is less than 2 seconds. *
S7	seconds	1–255*	50	Wait Time for Carrier, Silence, or Dial Tone:
				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 (answer).
				In originate mode, the timer is reset upon detection of answer tone if
				allowed by country restrictions.
				2. Sets the length of time, in seconds, that modem will wait for silence
				when encountering the @ dial modifier before continuing with the next
				dial string parameter.
				3. Sets the length of time, in seconds, that the modem will wait for dial
				tone when encountering a “W” dial modifier before continuing with the
				next dial string parameter. (US model.)
				The default is country dependent. *
S8	seconds	2–255	2	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. *

Multi-Tech Systems, Inc. SocketModem MT5600SMI Developer’s Guide 75