Specifications

Smart Machine Smart Decision
SIM900_AT Commands Manual_V1.07 84 2012.12.10
If error is related to ME functionality:
+CME ERROR: <err>
Note: The Command is writing only.
Parameters
<dtmf-string> Which has a max length of 20 characters, must be entered
between double quotes ("") and consists of combinations of the
following separated by commas. But a single character does not
require quotes.
1) <dtmf> A single ASCII characters in the set 0-9, #,*, A-D.
This is interpreted as a sequence of DTMF tones whose
duration is set by the +VTD Command.
2) {<dtmf>,<duration>} This is interpreted as a DTMF tone
whose duration is determined by <duration>.
<duration> Duration of the tone in 1/10 seconds range :1-255
Reference
GSM 07.07 [13]
Note
3.2.42 AT+CMUX Multiplexer Control
AT+CMUX Multiplexer Control
Response
+CMUX: list of supported (<mode>s),(<subset>s),(<port_speed>s),
(<N1>s),(<T1>s),(<N2>s),(<T2>s),(<T3>s),(<k>s)
OK
Test Command
AT+CMUX=?
Parameters
See Write Command
Response
+CMUX:[<mode>[,<subset>[,<port_speed>[,<N1>[,<T1>[,<N2>[,<T2
>[,<T3>[,<k>]]]]]]]]]
OK
ERROR
Read Command
AT+CMUX?
Parameters
See Write Command
Response
If error is related to ME functionality:
+CME ERROR: <err>
Write Command
AT+CMUX=<mo
de>[,<subset>[,<
port_speed>[,<N
1>[,<T1>[,<N2>[,
Parameters
<mode> Multiplexer transparency mechanism