Rs232 Interface - SimCom SIM900B EVB Development Kit Manual

SIM900B EVB User Guide

3.5 RS232 Interface

Serial Port——MAIN Interface
Debug Port——DEBUG Interface
Main Interface:
Pin Signal
1 DCD
2 TXD
3 RXD
4 DTR
5 GND
7 RTS
8 CTS
9 RI
Debug Interface:
Pin Signal
2 DBG_TXD
3 DBG_RXD
5 GND
SIM900B-EVB_UGD_V1.01
Figure 8： Serial Port and Debug Port
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
12 14.04.2010