SARA-R4/N4 series-AT Commands Manual
UBX-17003787 - R09

3IPC - Inter Processor Communication
Page 20 of 307
Parameter Type Description
This parameter is ignored and the value 0 is always displayed in case of read
command.
<N1> Number Maximum frame size:
• Allowed range is 1-1509.
• The default value is 31.
<T1> Number Acknowledgement timer in units of ten milliseconds. The allowed range is 1-255.
This parameter is ignored and the value 253 is always set.
<N2> Number Maximum number of re-transmissions:
• Allowed range is 0-5.
• The default value is 3.
<T2> Number Response timer for the multiplexer control channel in units of ten milliseconds. The
allowed range is 2-255.
This parameter is ignored and the value 254 is always set.
<T3> Number Wake up response timer. The allowed range is 0-255.
This parameter is ignored and the value 0 is always displayed in case of the read
command.
<k> Number Window size, for advanced operation with Error Recovery options. The allowed range
is 0-255.
This parameter is ignored and the value 0 is always displayed in case of the read
command.
3.1.4î™–î™–î™–î™–Notes
• If the multiplexer protocol is not started (the +CMUX set command has not been issued or returned an
error result code) and AT+CMEE is set to 2, the +CMUX read command returns the following error result
code: +CME ERROR: operation not allowed.
• For complete compatibility between u-blox products, leave the unsupported/unused parameters blank
(which are reported as blank by the +CMUX test command).
• <T1> must be lower than or equal to <T2>.
SARA-R4 / SARA-N4
• <subset> can only assume the value 0.
• <T1>, <T2>, <N2> values are ignored, since the related timers are not implemented.
• The command is only supported on the UART interface. It cannot be used on the USB port.
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