21
GETTING TO KNOW YOUR IVH-7700
2.3.4 Serial Port COM 1 (CN19)/ COM 2 (CN26)
Serial
Port
Pin No.
RS-232
RS-422
(5-wire)
RS-422
(9-wire)
RS-485
(3-wire)
1,2
1
DCD
TXD-
TXD-
DATA-
2
RXD
TXD+
TXD+
DATA+
3
TXD
RXD+
RXD+
-----------
4
DTR
RXD-
RXD-
-----------
5
GND
GND
GND
GND
6
DSR
-----------
RTS-
-----------
7
RTS
-----------
RTS+
-----------
8
CTS
-----------
CTS+
-----------
9
RI
-----------
CTS-
-----------
The pin assignments are listed in the table as follow :
BIOS Setting
Function
COM 1 (CN19) /
COM 2 (CN26)
RS-232
RS-422 (5-wire)
RS-422 (9-wire)
RS-485
RS-485 w/z auto-flow control
Serial port 1 (COM 1) and serial port 2 (COM 2) can be configured for RS-232,
RS-422, or RS-485 with auto flow control communication. The default definition
of COM 1 and COM 2 is RS-232, if you want to change to RS-422 or RS-485,
you can find the setting in BIOS.
D I
PIN 1 ~ 8
DO
PIN 11 ~ 18
20
11
10
1
