Specifications

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Chapter 4 - AT Commands, S-Registers and Result Codes
Command: S r = n Set Register Value
Values: r = S-register number; n varies
Default: None
Description: Set value of register S r to value of n , where n is
entered in decimal format.
Command: S r ? Read Register Value
Values: r = S-register number
Default: None
Description: Read value of register S r and display value in 3-
digit decimal form.
Command: &S n Data Set Ready Control
Values: n = 0, 1, or 2
Default: 1
Description: &S0 Force DSR high (on).
&S1 Let DSR follow CD.
&S2 DSR drops on disconnect, then goes high again.
(Used by some CBX phone systems.)
Command: &SF n DSR/CD Interaction Control
Values: n = 0 or 1
Default: 0
Description: &SF0 Select DSR to follow CD.
&SF1 Select DSR to be independent.