AT commands
Digi TransPort User Guide 132
S register definitions
In addition to the AT commands there are a number of Special (“S”) registers. These registers
contain numeric values that may represent time intervals, ASCII characters or operational flags.
To display the contents of a particular “S” register, the ATS command is used in the form ATSn?
where n is the number of the register whose contents are to be shown.
To store a new value into a register, use the S command in the form ATSN=X where N is the
number of the register to be changed and X is the new value. For example, ATS31=4 would store
the value 4 in S31.
The router maintains one set of registers for each ASY port. By default, the S command operates
ONLY on the S register set for the active port. To select an alternative default port, use the
AT\PORT command first.
Each register can only be set to a limited range of values as shown in the table below:
Register Description Units Default Range
S0 V.120 Answer enable Rings 0 0-255
S1 Ring count Rings n/a n/a
S2 Escape character ASCII 43 0-255
S9 DCD on delay ms x 20 0 0-255
S10 Pulse time for DCD Low ms x 10 0 0-255
S12 Escape delay ms 50 0-255
S15 Data forwarding timer ms 2 0-255
S16 RS422/485 serial port
settings
N/A 0 0, 2, 3
S23 Parity N/A 0 0-2 5 6
S31 ASY interface speed refer to full description n/a 0-11
S33 DTR dialing N/A 0 0 1
S45 DTR loss de-bounce 0.05 seconds (0.25s) 1-255
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