User's Manual

Serial Port 1
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
Serial Port 2
Pin Signal I/O Description
2 DEBUG_TX O Transmit data
3 DEBUG_RX I Receive data
5 GND GND
4.4 Antenna interface
Figure 5: Antenna interface
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