External Connections
50 – Installation
VL-486-4 Reference Manual
J1, J4 – S
ERIAL
P
ORT
C
ONNECTORS
Connectors J1 and J4 provide signals for two serial I/O ports: COM1 and COM2. COM1 signals
connect to the 10-pin header connector at J1. COM2 signals connect to the 10-pin header
connector at J4. COM1 supports RS-232 operation only, and COM2 operates in RS-232, RS-422,
or RS-485 mode.
Table 25: J1, J4 RS-232 Serial Port Connector Pinout
J1, J4
Pin
Signal
Name
RS-232 Signal
Description
Signal
Direction
1
DCD
Data Carrier Detect
In
2
DSR
Data Set Ready
In
3
RXD*
Receive Data
In
4
RTS
Request To Send
Out
5
TXD*
Transmit Data
Out
6
CTS
Clear To Send
In
7
DTR
Data Terminal Ready
Out
8
RI
Ring Indicator
In
9
Ground
Ground
—
10
N/C
—
—
Table 26: J4 RS-422/485 Serial Port Connector Pinout
RS-422
RS-485
J4
Pin
Signal
Name
Description
Direction
Signal
Name
Description
Direction
1
N/C
—
—
N/C
—
—
2
N/C
—
—
N/C
—
—
3
TD2+
Transmit Data
Positive
Out
TD2+
Transmit Data
Positive
Out
4
TD2–
Transmit Data
Negative
Out
TD2–
Transmit Data
Negative
Out
5
N/C
—
—
N/C
—
—
6
Ground
Ground
Ground
Ground
—
7
RD2–
Receive Data
Negative
In
TD2/RD2–
Transmit/Receive
Data Negative
Out/In
8
RD2+
Receive Data
Positive
In
TD2/RD2+
Transmit/Receive
Data Positive
Out/In
9
N/C
—
—
N/C
—
—
10
N/C
—
—
N/C
—
—