User Manual

SIM900 EVB User Guide
SIM900-EVB_UGD_V1.01 16 08.12.2009
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
J104 Interface Pin List:
Pin Signal I/O Description
1 KCOL0
2 KROW0 I
3 KCOL1
4 KROW1
5 KCOL2
6 KROW2
Keypad array interface