CK721-A Installation and Operation S300 Expansion Enclosures
24-10349-8 Rev. B 3-27
This document contains confidential and proprietary information of Johnson Controls, Inc.
© 2012 Johnson Controls, Inc.
Reader module addresses are assigned in terminal pairs:
1 and 2
3 and 4
5 and 6
7 and 8
No two reader modules connected to the same CK721-A can have the same address.
The address of the reader terminal pair is determined by SW1 switch settings on the
reader module as shown in
Table 3-13.
NOTE
When you install modules in a stack configuration, it is difficult to set the
switches of the first level modules and connect the RS-485 cables once
the stacked modules are installed.
Table 3-13: Reader Module Address Settings
Readers Address
(Terminal Pairs)
Reader Module SW1 Settings
1 2 3 4
1 & 2 Off Off Off
3 & 4 On Off Off *
5 & 6 Off On Off *
7 & 8 On On Off *
9 & 10 Off Off On *
11 & 12 On Off On *
13 & 14 Off On On *
15 & 16 On On On *
Notes:
1. All reader modules must have different settings.
2. Reader addresses are determined only by the SW1 switch settings, not by the
physical location of the module within the system.
* If a reader module is the last in the chain (this includes I/O modules, not just
reader modules) position 4 must be set ON.
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