Siemens M55 Repair Manual page 7

Table 1: M55/M56 Bottom Connector Pin Description
Pin Name
1 POWER
2 GND
3 TX_1
4 RX_1
5 CTS_1
6 RTS_1
7 DCD_1
8 AUDIO_P
9
10 AUDIO_N
11 GND_MIC
12 EPP1
V 1.0
M55/M56
IN/OUT Notes
I/O POWER is needed for charging
batteries and for supplying the
accessories
O Serial interface
I Serial interface
I/O Data line for accessory bus
I/O Use as RTS in data operation
I/O Clock line for accessory bus
Use as DTC In data operation
O External loudspeaker
OI External loudspeaker
I External microphone
O External microphone
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