S-registers – Multi-Tech Systems 7500 User Manual

Page 285

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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.)

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