Test Interface - SimCom SIM900B User Manual

SIM900B EVB kit User Guide

4 Test Interface

4.1 J1---RS232
Table 9: RS232 pin list
Pin Signal
1 TXD
2 RXD
3 DCD
4 RI
5 CTS
6 GND
7 DTR
8 DBG_RXD
9 RTS
10 DBG_TXD
SIM900B_EVB kit_User Guide_V1.02
Figure 10: Test interface overview
Figure 11: J1 interface
I/O
O
I
O
O
O
I
I
I
O
16
Description
Transmit data
Receive data
Data carrier detection
Ring Indicator
Clear to Send
GND
Data Terminal Ready
Receive data
Request to Send
Transmit data
2010-11-10