VAR4 – Installation Guide
Issue: 02 complete, approved
Page 11 of 20
PSU 1 and PSU 2: Dual DC Power Supply
PSU 1
PSU 2
- +
- +
2-way pluggable Wago cage clamp terminal (female)
Signal Description
+
+V supply (18 V to 40 V DC)
-
0 V supply
1) PSU1 should come from an ASL Amplifier
Mainframe AUX DC SUPPLY OUT terminations.
Where possible, two mainframe outputs may be
paralleled to feed PSU1 (one from each of two
different mainframes) to provide a measure of
current sharing and redundancy.
2) PSU2 should come directly from the battery via
a fuse or breaker adequate to protect the cable
from the potentially dangerous short circuit
currents associated with SLA batteries.
RS232: RS232 Port
1
2
3
4
5
6
7
8
9
RX
TX DTR GND
RTS CTS
Standard 9-way D connector (male)
Pin No
Signal
Description
1, 6, 9
-
Not connected
2
RX
RS232 Received Data
3
TX
RS232 Transmitted Data
4
DTR
Data Terminal Ready
5 GND
Common
Ground
7
RTS
Request To Send
8
CTS
Clear To Send
EXP 1: RS485 Port
1
2
3
4
5
6
7
8
9
0V
RS485 DXP
RS485 DXN
Standard 9-way D connector (male)
Pin No
Signal
Description
1, 2, 4,
6, 7, 8
-
Not connected
Do not make connections to these pins.
3
0V
0 V Reference
5 RS485DXP
Data+
(EIA RS485 9600 baud)
9 RS485DXN
Data-
(EIA RS485 9600 baud)
