Serial Port1 Connector (Com1); Serial Port 2, 3, 4 Connectors (Com2, Com3, Com4) - AXIOMTEK SBC84831 Series User Manual

2.4.11 Serial Port1 Connector (COM1)

The COM 1 Port connector is a standard DB-9 connector.
Pin
1 DCD, Data carrier detect
2 RXD, Receive data
3 TXD, Transmit data
4 DTR, Data terminal ready
5 GND, ground
6 DSR, Data set ready
7 RTS, Request to send
8 CTS, Clear to send
9 RI, Ring indicator
2.4.12 Serial Port 2, 3, 4 Connectors (COM2, COM3,
COM4)
Here is the pin assignment list for your reference.
Pin Signal
Data Carrier Detect (DCD)
1
Receive Data (RXD)
3
Transmit Data (TXD)
5
Data Terminal Ready (DTR)
7
Ground (GND)
9
Jumpers and Connectors
SBC84831 All-In-One Capa Board User's Manual
Signal
Pin
Data Set Ready (DSR)
2
Request to Send (RTS)
4
Clear to Send (CTS)
6
Ring Indicator (RI)
8
N.C.
10
Signal
25