User's Manual

SIM840W EVB User Guide
SIM840W-EVB_UGD_V1.00 17 2011-06-22
Pin
Signal I/O
Description
1 TXD O Transmit data
2 RXD I Receive data
3 DCD O Data carrier detection
4 RI O Ring Indicator
5 CTS O Clear to Send
6 GND GND
7 DTR I Data Terminal Ready
8 DEBUG_RX I Receive data
9 RTS I Request to Send
10 DEBUG_TX O Transmit data
4.3 J104
Figure 13: J104 Interface