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OnCell G2150I AT Command Set V24-V25 Commands
9-2
Fixed DTE Rate: +IPR
Description: This command specifies the data rate at which the DCE will accept commands.
Notes:
y The serial autobauding feature is supported, and covers the following serial speeds (only):
2400, 4800, 9600, 19200, 38400, 57600 bps. Beyond those serial speeds, proper operation
of the G2150I is not guaranteed.
y 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 resynchronize the modem.
y The DTE waits for 1 ms 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 baud.
Command syntax: AT+IPR=<rate>
Command Possible responses
AT+IPR? +IPR: 9600
OK
Note: Current rate is 9600 bps
AT+IPR=? +IPR: (0, 2400, 4800, 9600, 19200, 38400, 57600), (300,
600, 1200, 115200)
OK
Note: Possible values, according to V25ter
Recommendation: the first set of values indicates the range of
auto-detectable baud rates (including 0). The second set of
values indicates the baud rates supported by the DCE but not
auto-detectable.
AT+IPR=38400 OK
Note: Disable autobauding and set rate to 38400 bps
AT+IPR=0 OK
Note: Enable autobauding
Defined values: <rate>: baud rates that can be used by the DCE
• 0 (enables autobauding)
• 300
• 600
• 1200
• 2400
• 4800
• 9600
• 19200
• 38400
• 57600
• 115200