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
