Chapter 1: Introduction | 5
BIH11-AHA User’s Manual
1�3
Rear Panel Connectors
COM1: Serial port Connectors (RS-232/RS422/RS485)
1
5
6
9
RS-232 (Default)
RS-422*
RS-485*
Pin Assignment
1
Carrier detect (DCD)
422 TXD-
485 DATA-
2
Received data (RXD)
422 TXD+ 485 DATA+
3
Transmitted data (TXD)
422 RXD+ NC
4
Data terminal ready (DTR) 422 RXD-
NC
5
Signal ground (GND)
GND
GND
6
Data set ready (DSR)
NC
NC
7
Request to send (RTS)
NC
NC
8
Clear to send (CTS)
NC
NC
9
*RI, 5V, 12V selected by
(selected by JP1 setting)
NC
NC
COM2: Serial Port Connectors (RS-232)
1
5
6
9
Pin Assignment
Pin
Assignment
1
DCD
2
RXD
3
TXD
4
DTR
5
GND
6
DSR
7
RTS
8
CTS
9
*RI, 5V, 12V selected by
(selected by JP2 setting)
Note
»
»
COM1/2 voltage selection is controlled by JP1/ JP2 setup.
»
»
COM1 (RS-232/422/485) & COM2 (RS-232) selection is controlled by JSEL1/JSEL2.
