Westermo GDW-11 - Manual (Page 160)

160 V.24-V.25 commands 6615-2220
V.24-V.25 commands
+IPR – Fixed DTE rate
Description:
This commands specifies the data rate at which the DCE will accept commands.
NOTE:
… The serial autobauding feature is supported, and covers the following serial speeds
(only): 2400, 4800, 9600, 19200, 38400, 57600 bit/s. Beyond those serial speeds,
proper operation of the modem is not guaranteed.
… Any AT command issued by the DTE must start with both capital ‘A’ and ‘T’ (or ‘/’)
or both lower case ‘a’ and ‘t’ (or ‘/’), otherwise the DCE may return some garbage
characters and become desynchronized. Should this happen, the DTE simply issues
‘AT\r’ (at 2400 or 4800 bauds) once or twice or just ‘AT’ (at 9600 bauds) to resyn-
chronize the modem.
… The DTE waits for 1ms after receiving the last character of the AT response (which
is always ‘\n’ or 0x0A) to send a new AT command at either the same rate or a
new rate. Should this delay be ignored, the DCE can become desynchronized. Once
again, sending ’AT\r’ once or twice or just ‘AT’ causes the DCE to recover.
Caution:
When starting up, if autobauding is enabled and no AT command has yet been received,
the product sends all unsolicited responses (like RING) at 9600 bauds.
Syntax
AT+IPR=
Parameters:
baud rates that can be used by the DCE
0 (enables autobauding)
300
600
1200
2400
4800
9600
19200
38400
57600
115200