- Power Measurement Modem User's Guide

ION 7500 / ION 7600 User’s Guide S-Registers
Modem AT Commands Technical Note Page 285
S-Registers
S-registers are memory locations that store certain modem values or parameters.
S commands are used to read or alter the contents of S-registers.
%En
Fallback and Fall
Forward Control
n = 0, 1, or 2 2
%E0 Disable fallback and fall forward.
%E1 Enable fallback, disable fall forward.
%E2 Enable fallback and fall forward.
$MBn Online BPS Speed
n = speed in bits
per second
28,800
$MB75 Selects CCITT V.23 mode
$MB300 Selects 300 bps on-line
$MB1200 Selects 1200 bps on-line
$MB2400 Selects 2400 bps on-line
$MB4800 Selects 4800 bps on-line
$MB9600 Selects 9600 bps on-line
$MB14400 Selects 14,400 bps on-line
$MB19200 Selects 19,200 bps on-line
$MB28800 Selects 28,800 bps on-line
$MB33600 Selects 33,600 bps on-line
$SBn Serial Port Baud Rate
n= speed in bits
per second
115200
$SB300 Selects 300 bps at serial port
$SB1200 Selects 1200 bps at serial port
$SB2400 Selects 2400 bps at serial port
$SB4800 Selects 4800 bps at serial port
$SB9600 Selects 9600 bps at serial port
$SB19200 Selects 19,200 bps at serial port
$SB38400 Selects 38,400 bps at serial port
$SB57600 Selects 57,600 bps at serial port
$SB115200 Selects 115,200 bps at serial port
$SB230400 Selects 230,400 bps at serial port
Command Values Default Description
Register Unit Range Default Description
S6 seconds 2-65* 2*
Sets the time the modem waits after it goes off-hook before it begins to dial the
telephone number.
S7 seconds 1-255* 50*
Sets the time the modem waits for a carrier signal before aborting a call. Also sets
the wait for silence time for the @ dial modifier.
S8 seconds 0-65 2 Sets the length of a pause caused by a comma character in a dialing command.
S10 100 ms 1-254 20 Sets how long a carrier signal must be lost before the modem disconnects.
S11 1ms 50-150* 95* Sets spacing and duration of dialing tones.
S28 decimal 0, 1-255 1 0 disables, 1.255 enables V.34 modulation.
S30 1 minute 0, 1-255 0
Sets the length of time that the modem waits before disconnecting when no data is
sent or received. A value of zero disables the timer. See also the \T command
S35 decimal 0-1 0
0 disables, 1 enables the V.25 calling tone, which allows remote data/fax/voice
discrimination.
S36 decimal 0-7 7
Specifies the action to take in the event of a negotiation failure when error control is
selected. (See S48.)