SIM800 Series_Multiplexer_Application Note_V1.04
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Note 5:
The bit means the channel of the MSC message send to.
4.2 Frame Transmission
After establishment of control channel and data channels, TE and MS can transmit data through UIH frames
between each other.
No
Step
Data Direction
Hex
Comment
TE<——>MS
1
TE sends AT command
"ATI<CR>" through DLC 1
——>
F9 07 EF 09 41 54 49
0D 58 F9
UIH Frame
MS feeds back through DLC
1
<——
F9 07 EF 09 41 54 49 0d
3F F9
F9 07 EF 21 0D 0A 53
49 4D 39 30 30 20 52 31
31 2E 30 0D 0A FF F9
F9 07 EF 0D 0D 0A 4F
4B 0D 0A 4A F9
UIH Frame
2
TE sends AT command
"AT<CR>" through DLC 2”
——>
F9 0B EF 07 41 54 0D
35 F9
UIH Frame
MS feeds back through DLC
2
<——
F9 0B EF 06 00 61 74
0D EF F9
F9 0B EF 0C 00 0D 0A
4F 4B 0D 0A DF F9
UIH Frame
3
DLC 3, 4 are same as
above
4.3 Power Saving Mode and Wake Up
Power saving
No
Step
Data Direction
Hex
Comment
TE<——>MS
1
TE sends PSC message
through DLC 0
——>
F9 03 EF 05 43 01
F2 F9
PSC Command
Frame