IBASE Technology IB836 Series User Manual page 28

2.5.1 COM1 RS-232/422/485 Port (CN4)
COM1 port is jumper-less and configurable in BIOS.
Pin Assignment
1 DSR, Data set ready
2
3
4 TX, Transmit
5 RX, Receive
Pin
RS-232
1 DSR
2 Ground
3 Ground
4 TX
5 RX
6 DCD
7 DTR
8 CTS
9 RTS
10 RI
20
Ground
Ground
Assignment
RS-422
NC
Ground
Ground
RX+
TX+
TX-
RX-
NC
NC
NC
Pin Assignment
6 DCD, Data carrier detect
7 DTR, Data terminal ready
8 CTS, Clear to send
9 RTS, Request to send
10 RI, Ring Indicator
RS-485
NC
Ground
Ground
NC
Data+
Data-
NC
NC
NC
NC
IB836 User's Manual