Galaxy 3 Series Installation Manual
2-11
2. The system must be wired in a daisy-chain configuration. Spur and star configurations must not
be used as they reduce the immunity to electrical interference.
3. The cable used to connect the RS485 (AB) line must be screened twisted pair (Part No. W002) or
Belden 8723 equivalent.
4. Shielded twisted pair cable, where used, is connected to the earthing pillar on the Galaxy control
panel using the P-clip and nut supplied (refer to Figure 2-10).
5. The RS485 (AB) line must have a 680 Ω resistor fitted across the A and B terminals of the last
module on the line. If twin lines are connected, both ends must be terminated with 680 Ω resistors and
the appropriate link on the control panel PCB must be removed (refer to figure 2-9).
Figure 2-9. Twin AB Line Daisy-Chain configuration
RS485 Wiring Recommendations
To ensure that the system communicates at the maximum level of efficiency, the following recommendations
must be adhered to:
1. Each communication line can support 32 devices. The maximum number of devices on each line
are:
Table 2-5. Communication Devices
RS485 Recommendations
A
B
A
B
Galaxy
Control
Panel
680 Ω EOL
680 Ω EOL
A
B
Keypad/Keyprox
OR
Module
Keypad/Keyprox
OR
Module
Remove
LK3/LK5
Galaxy 3-48
(Line 1 only)
Galaxy 3-144
(Lines 1-2)
Galaxy 3-520
(Lines 1-4)
Keypads
8 8 per line 8 per line
Keyprox
3
3 (line 1)
4 (line 2)
3 (line 1)
7(lines 2, 3, 4)
RIO's/SPSU's
4 8 per line
15 (line1)
16 (lines 2, 3, 4)
Output Module
4 4 per line 4 per line
RF RIO
4 8 per line
15 (line 1)
16 (lines 2, 3, 4)
MAX
4 4 per line 8 per line
RS232
1 1 (line 1 only) 1 (line 1 only)
Telecoms
1 1 (line 1 only) 1 (line 1 only)
Printer
1 1 (line 1 only) 1 (line 1 only)
ISDN
1 1 (line 1 only) 1 (line 1 only)
Ethernet
1 1 (line 1 only) 1 (line 1 only)
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