Axiomtek IPC932-230-FL-ECM - Manual (Page 23)

IPC932-230-FL Series U ser’s Manual
Introduction 15
1.7.11 COM Connectors (COM1~COM2)
The COM port supports RS-232/RS-422/RS-485 mode operation, see table below for
its pin assignments. You can change the transmission mode via BIOS setting.
Pin RS-232 RS-422 RS-485
1
Data Carrier Detect
(DCD1)
TX1- DATA1-
2 Data Set Ready (DSR1) No connector No connector
3 Receive Data (RXD1) TX1+ DATA1+
4 Request to Send (RTS1) No connector No connector
5 Transmit Data (TXD1) RX1+ No connector
6 Clear to Send (CTS1) No connector No connector
7
Data Terminal Ready
(DTR1)
RX1- No connector
8 Ring Indicator (RI1) No connector No connector
9 Ground (GND) GND GND
10 Disconnect (NI) NI NI
11
Data Carrier Detect
(DCD2)
TX2- DATA2-
12 Data Set Ready (DSR2) No connector No connector
13 Receive Data (RXD2) TX2+ DATA2+
14 Request to Send (RTS2) No connector No connector
15 Transmit Data (TXD2) RX2+ No connector
16 Clear to Send (CTS2) No connector No connector
17
Data Terminal Ready
(DTR2)
RX2- No connector
18 Ring Indicator (RI2) No connector No connector
19 Ground (GND) GND GND
20 Disconnect (NI) NI NI