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SIM908 EVB kit User Guide
4.1 GSM serial ports
Pin
Signal
1
TXD
2
RXD
3
DCD
4
RI
5
CTS
6
GND
7
DTR
8
DEBUG_RX
9
RTS
10
DEBUG_TX
SIM908_EVB kit_ User Guide _V1.00
Figure 13: GSM serial ports
I/O
Description
O
Transmit data
I
Receive data
O
Data carrier detection
O
Ring Indicator
O
Clear to Send
GND
I
Data Terminal Ready
I
Receive data
I
Request to Send
O
Transmit data
17
2011.8.15
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