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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

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 47 48

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