SIM340DZ EVB User Guide
3.5 RS232 Interface
Figure 8: Serial Ports
Serial Port 1
——
MAIN Interface
Serial Port 2
——
DEGUG Interface
Main Interface:
Pin
Signal
I/O
Description
1 DCD O
Data carrier detection
2 TXD O
Transmit data
3 RXD
I
Receive data
4 DTR
I
Data Terminal Ready
5 GND
GND
7 RTS
I
Request to Send
8 CTS O
Clear to Send
9 RI O
Ring Indicator
Debug Interface:
Pin
Signal
I/O
Description
2 DEBUG_TX O
Transmit data
3 DEBUG_RX
I
Receive data
5 GND
GND
SIM340DZ-EVB_UGD_V2.01 Page 11 of 19
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