Rs485 Expansion Module (G3-520 Only) - Honeywell Galaxy 3-48C Installation Manual

Galaxy 3 Series Installation Manual
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.
NOTE: Output 2 on RIO 0 (relay output) is not affected.
The following table shows which outputs are controlled by which switches.

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.
+12V
1 2 3 4 5
0V 0V RIO 0 0V
(SW3)
1
2
3
4
5
6
7
Table 2-1. SW3 Transistorised Outputs Control
LK1
Twin
RS485
lines
+12V +12V
6 7 8 1 2 3 4
0V 0V 0V RIO 1
Figure 2-5. RS485 Expansion Module
RS485 Expansion Module
RIO Output
0 1
0 3
0 4
1 1
1 2
1 3
1 4
RS485
EXPANSION
MODULE
Jumpers
LK2
A3 B3 A4 B4
1
+12V
5 6 7 8
0V 0V
2-5
AUX
1 2 3 4
3 4
2
TAMP
RIO 1
RIO 0
G
N
D