Honeywell Galaxy 3-48C Installation Instruction
Galaxy 3 Series Installation Manual
2-5
The 7 transistorised outputs on the Galaxy 3 Series can be configured to open collectors by setting the dip
switch SW3 to the OFF position.
switch SW3 to the OFF position.
NOTE: Output 2 on RIO 0 (relay output) is not affected.
The following table shows which outputs are controlled by which switches.
Table 2-1. SW3 Transistorised Outputs Control
RS485 Expansion Module (G3-520 only)
The RS485 Expansion Module can be attached to the G3-520 to give 2 extra RS485 (AB) lines.
The Expansion module must be wired in a daisy-chain configuration. That is, the A line from the previous
module is connected to the A3 or A4 terminal of the Expansion Module.
The RS485 (AB) line must have a 680 ohm resistor fitted across the A and B terminals of the last module on
the line. If two lines are connected, both ends must be terminated with a 680 ohm resistor and the appropriate
link (LK1 or LK2) removed.
The Expansion module must be wired in a daisy-chain configuration. That is, the A line from the previous
module is connected to the A3 or A4 terminal of the Expansion Module.
The RS485 (AB) line must have a 680 ohm resistor fitted across the A and B terminals of the last module on
the line. If two lines are connected, both ends must be terminated with a 680 ohm resistor and the appropriate
link (LK1 or LK2) removed.
RS485 Expansion Module
Figure 2-5. RS485 Expansion Module
+12V
+12V
+12V
+12V
1
2
3
4
2
AUX
TAMP
TAMP
G
N
D
RIO 0
1
3
RIO 1
+12V
4
1
2
0V
3
4
0V
RIO 0
5
6
0V
7
8
0V
1
2
0V
3
4
0V
RIO 1
5
6
0V
7
8
0V
A4
RS485
EXPANSION
MODULE
EXPANSION
MODULE
Jumpers
LK1
LK2
Twin
RS485
lines
RS485
lines
A3 B3
B4
(SW3)
RIO
Output
1
0
1
2
0
3
3
0
4
4
1
1
5
1
2
6
1
3
7
1
4