S300 Expansion Enclosures CK721-A Installation and Operation
3-38 24-10349-8 Rev. B
This document contains confidential and proprietary information of Johnson Controls, Inc.
© 2012 Johnson Controls, Inc.
LEGACY I/O MODULES
Legacy I/O modules provide alarm inputs and output relays for the CK721-A
system. A single CK721-A panel can communicate with 24 legacy modules: 8
reader modules and up to 16 I/O legacy modules. When planning what modules to
include, consider the following:
The I16 module has 16 input points. The CK721-A can support sixteen of
these.
The SIO8 module has 8 supervised (4-state) inputs and 8 outputs. The
CK721-A can support eight of these.
The IO8 module has 8 unsupervised (2-state) inputs and 8 outputs. The
CK721-A can support sixteen of these.
The SI8 module has 8 supervised (4-state) inputs. The CK721-A can support
eight of these.
Firmware Versions for Legacy I/O Modules
Table 3-16: Legacy I/O Module Firmware Versions
Modules Model Number
SIO8 and SI8 PS-184B or later
IO8 and I16 PS-183D or later
*Required for High Speed RS485
RS-485 Wiring
All modules connected to a single CK721-A communicate through an RS-485
interface as implemented by Cardkey. Each module contains two RS-485
connectors.
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