Specifications

Smart Machine Smart Decision

SIM900_AT Commands Manual_V1.07 85 2012.12.10

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0 Basic option

<subset> The way in which the multiplexer controls channel is set up

0 UIH frames used only

<port_speed> Transmission rate

1 9 600 bits/t

2 19 200 bits/t

3 38 400 bits/t

4 57 600 bits/t

5 115 200bit/s

6 230 400 bits/t

7 460 800 bits/t

Proprietary values, available if MUX NEW PORT

SPEED FTR is activated

8 921 600 bits/t

Proprietary values, available if MUX NEW PORT

SPEED FTR is activated

<N1> Maximum frame size

1-255 Default: 127

<T1> Acknowledgement timer in units of ten milliseconds

1-254 Default:10 (100 ms)

<N2> Maximum number of re-transmissions

0-100 Default:3

<T2> Response timer for the multiplexer control channel in units

of ten milliseconds

2-255 Default:30

<T3> Wake up response timers in seconds

1-255 Default:10

<k> Window size, for Advanced operation with Error Recovery

options

1-7 Default:2

Reference

GSM 07.07 [13]

Note

The multiplexing transmission rate is according to the current serial baud

rate. It is recommended to enable multiplexing protocol under 115200

bit/s baud rate

Multiplexer control channels are listed as follows:

Channel Number Type DLCI

None Multiplexer Control 0

1 07.07 and 07.05 1

2 07.07 and 07.05 2

3 07.07 and 07.05 3

4 07.07 and 07.05 4