
Page 18 AmITX-BT-I
4.1.2. Serial COM Ports (COM1, COM2)
COM1: Supports RS-232/422/485
COM2: Supports RS-232 only
Pin # RS-232 RS-422 RS-485
1 DCD, Data Carrier Detect TX- RTX-
2 RXD, Receive Data TX+ RTX+
3 TXD, Transmit Data RX+ N/A
4 DTR, Data Terminal Ready RX- N/A
5 GND N/A N/A
6 DSR, Data Set Ready N/A N/A
7 RTS, Request To Send N/A N/A
8 CTS, Clear To Send N/A N/A
9 RI, Ring Indicator N/A N/A
SW14: Switch for mode selection of COM1 (default RS-232).
SW14
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