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MultliModemISI Hybrid Series, ISIHI-2S 105
Chapter 5—TERMINAL ADAPTER AT Commands, S-Registers, Result Codes
Terminal Adapter
Terminal Adapter S-Registers
S-Registers are sections of memory in which values are stored that affect how the TA
operates. S-Registers are so-called because each has a name that begins with the
character
S
. Use the
S
command to assign a value to or to read the current value of an
S-register. To assign a value to an S-register, use the command
Sr=n
, in which
r
is the
register number, and
n
is the value you want to assign to the register, e.g.,
S7=45
.
To
read an S-register value, use the command
Sr?
, in which
r
is the register number, e.g.,
ATS7?
.
S-Register Summary
S-Register Function
S0 Rings until answer
S1 Ring count
S2 Escape character
S3 Carriage return character
S4 Line feed character
S5 Backspace character
S7 Wait for connection (abort timer)
S10 DCD Drop Time
S25 DTR Drop Time
S32 Escape sequence timeout
S50 Caller line ID (CLI)
S52 Auto-protocil detection
S53 Maximum frame size (X.75)
S0
Number of Rings Until Answer
Unit: 1 ring
Range: 0–255
Default: 1
Sets the number of rings the TA waits for before it answers and begins its connect
sequence.
S0=0
turns off the ability to automatically answer a call.
S0=1
causes the TA
to automatically answer after 1 ring. Note that if the
S0
value is set too high, the calling
device may time out before the TA answers the call. For autoanswer,
S0
must have a
non-zero value, DTR must be high (
&D
command), and the TA must be offline.
S1
Ring Count
Unit: 1 ring
Range: 0–255
Default: 0
Counts the number of rings that have occurred, up to a maximum of 255. It is a read-only
register and is seldom, if ever, used in typical operation.
S2
Escape Character
Unit: Decimal ASCII code
Range: 0–127
Default: 43 (+)
Specifies the character used by the TA to escape from data mode and return to
command mode.