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Chapter 4 - AT Commands, S-Registers, and Result Codes
S-Register: S5
Function: Backspace Character
Unit: Decimal ASCII code
Range: 0–32, 127
Default: 8 (^H)
Description:Specifies the character used by the TA to delete the previous character in the
command line.
S-Register: S7
Function: Wait for Connection (Abort Timer)
Unit: 1 second
Range: 0–255
Default: 45
Description:Sets the Abort Timer delay time, which is the length of time the TA waits for a
connection after dialing. If no connection is established during the specified
time, the TA ends the call.
S-Register: S8
Function: Pause Time for Comma
Unit: 1 second
Range: n=0-255
Default: 2 (2 seconds)
Description:S8 sets the length of the pause caused by a comma inserted in a dialing
command. The default setting is 2 seconds, where each unit is one second.
S8 may be set for up to 255 seconds.
S-Register: S10
Function: DCD Drop Time
Unit: 50 ms
Range: 0–254, 255
Default: 20
Description:Sets the time after a carrier signal is lost before the TA disconnects. (The
&C2 command must be in effect.) Default setting is one second. Maximum
delay is 25.4 seconds (S10=254). Set S10 to 255 to cause the TA not to
disconnect with loss of carrier.
S-Register: S25
Function: DTR Drop Time
Unit: 100 ms
Range: 0, 1–255
Default: 5
Description:Sets the time that DTR must remain low before TA disconnects. The S25 unit
value for 0 is 50 ms. For values from 1 through 255, the unit value is 100 ms.
S-register: S30
Function: On-line Inactivity Timer
Unit: 1 minute
Range: n=0 Does not disconnect
n=1–255
Default: 0 (does not disconnect)
Description:Makes the TA disconnect a data connection if no data is transmitted or
received for the specified time. It will NOT cause a POTS call (voice/modem/
fax) to disconnect. The timer restarts any time a data character passes
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