Main Interface And Debug Interface - SimCom SIM900B User Manual

SIM900B EVB kit User Guide
3.5

Main Interface and Debug Interface

Table 6: Main interface
Pin Signal
1 DCD
2 TXD
3 RXD
4 DTR
5 GND
7 RTS
8 CTS
9 RI
Table 7: Debug interface
Pin Signal
2 DBG_TXD
3 DBG_RXD
5 GND
SIM900B_EVB kit_User Guide_V1.02
Figure 8: Main interface and debug interface
I/O
O
O
I
I
I
O
O
I/O
O
I
Description
Data carrier detection
Transmit data
Receive data
Data Terminal Ready
GND
Request to Send
Clear to Send
Ring Indicator
Description
Transmit data
Receive data
GND
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2010-11-10