CK721-A Installation and Operation Introduction
24-10349-8 Rev. B 1-9
This document contains confidential and proprietary information of Johnson Controls, Inc.ï€
© 2012 Johnson Controls, Inc.
CK721-A PANEL CONFIGURATION
Expanded Address S300 Bus Configuration
Each CK721-A can support up to 64 logical terminal numbers assigned to reader
modules and I/O modules. The expanded address S300 bus configuration requires
the use of the following hardware module types:
 RDR2S-A
 I8O4
 RDR8S
 I32O16
For optimum 64 terminal access grant response time, only (RDR2S-A, I8O4,
RDR8S, I32O16) hardware module types should be used. Legacy Reader and
Legacy I/O hardware module types, RDR2, IO8, I16, SI08, SI8, and RDR2S, have a
significant impact on access grant times, and should not be used under the expanded
address S300 bus configuration.
See Appendix A: Expanded Address S300 Bus for further details on the expanded
address S300 bus configuration and programming.
NOTE
For fastest response times, the terminals should be defined on as few
S300 modules as possible, and all S300 modules should be operating in
physical addressing mode. The typical response time to an access request
in an idle CK721-A with 64 terminals on 8 RDR8S modules is less than
500 ms. The typical response time to an access request in an idle
CK721-A with 64 terminals on 32 RDR2SA modules is less than 1s. See
Appendix B: Performance Analysis for details.
Legacy Address S300 Bus Configuration
Each CK721-A can support up to 16 logical terminal numbers assigned to reader
modules, and up to 16 logical terminal numbers assigned to I/O modules. Therefore,
a CK721-A supports up to 24 hardware modules within the following parameters:
 A maximum of eight RDR2 or RDR2S reader modules can be connected to a
single CK721-A for a maximum of 16 readers per CK721-A.
 All 16 logical terminal numbers apply only to IO8 and I16 hardware modules.
If you are using SIO8 or SI8 hardware modules (supervised, 4-state alarms),
you can only use logical terminal numbers 1 through 8; logical terminal
numbers 9 through 16 will be invalid.
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