User guide

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Chapter 5 - AT Commands
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)
S8 Pause Time for Comma
S10 DCD Drop Time
S25 DTR Drop Tim
S29 Online Inactivity Timer Period
S30 Online Inactivity
S32 Escape sequence timeout
S34 Maximum escape sequence length
S50 Caller line ID (CLI)
S52 Auto-protocol detection
S53 Maximum X.75 Buffer Size
S54 B-Channel Origination Rate
S55 POTS Port Call Control
S56 Calling Party Number IE Settings
S57 Called Party Number IE Settings
S79 Reset Modem After Disconnect
S80 Persistent DTR Dialing Delay
S81 Link Setup Timeout
S84 Data to Terminal Delay
S85 Data to B-Channel Delay
S87 En-Block Analog Call Origination Delay
S89 Modem Ring/Dialtone Information
S154 B-Channel Answer Rate