Chapter 1: Installation
CDC4 Door Controller Installation and Programming Manual 27
Devices can be connected to CDC4 via the 4-pin RS-485 terminals for bus 1
(Figure 12 on page 13, item 19) or bus 2 (Figure 12, item 18).
Alternatively, devices can be connected to Bus 1 via the 4-pin plug-in RS-485
sockets (Figure 2 on page 7, items 17 and 20). The sockets are for easy
connection to the expander boards that support the connection such as the CDC-
2DWIF Dual Wiegand Interface.
Using the plug-in Bus 1 sockets
To easily connect an expander board to Bus 1, connect a 4-way RS-485 cable
(supplied with the expander board) to one of the 4-pin plug-in RS-485 cable
sockets (Figure 2 on page 7, items 17 and 20).
Refer to Figure 4 on page 12 for example connections of 4-way RS-485 cables
from a NAC to an expander board (items B and D).
Figure 15: Example CDC4 to CDC-2DWIF cable connections for RS-485 and lock power
A, C: 2-wire lock power cable
B, D: 4-wire RS-485 cable
Using the data bus terminals
An example connection of a reader to one of the local buses is shown in
Figure 16 on page 28.
CDC4
CDC-2DWIF
CDC-2DWIF
A B
C D
A
B
C
D
A
B
C
D
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