Terminal Adapter S-Registers

Chapter 5—TERMINAL ADAPTER AT Commands, S-Registers, Result Codes

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.

Terminal Adapter

MultliModemISI Hybrid Series, ISIHI-2S

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ISIHI-2S specifications

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Multi Tech Equipment ISIHI-2S Terminal Adapter S-Registers, Register Summary, S2 Escape Character

Models: ISIHI-2S