Johnson Controls CK721-A User Manual

CAUTION: Risk of Explosion.
Replace the battery with a lithium battery of the same type and voltage
rating. Dispose of the used battery in accordance with local, national, and
regional regulations. Failure to replace the battery with one of the same
type and voltage rating may result in an explosion causing personal injury
and property damage.
CK721-A Installation and Operation CK721-A and S300-DIN Enclosures
24-10349-8 Rev. B 2-5
This document contains confidential and proprietary information of Johnson Controls, Inc.
© 2012 Johnson Controls, Inc.
Input Power
The input power is described in the following table:
Table 2-2: Input Power
Inputs V Min V Nom V Max
+24VDC 20 24 30
RS485
CK721-A has two RS485 ports:
 RS485A is used by OTIS BMS elevator communications
 RS485B is used to communicate with external devices such as RDR8S
RDR2S, RDR2S-A, RDR2, IO8, SIO8, and I16
NOTE
The following modules can be assigned to logical terminals 1 though 64: RDR8S,
I32O16, and RDR2S-A. The following units can be assigned only to logical
terminals 1 though 16: RDR2S, RDR2, IO8, SIO8, and I16.
The controller can communicate on the serial bus by either of the following settings:
 19200 bps, no parity, 8 bits per character, and one stop bit
 9600 bps, even parity, 8 bit per character, and one stop bit
Figure 2-1 and Figure 2-2 show shows the wiring between RS48
5B and the devices.

Johnson Controls CK721-A Specifications

General

Brand	Johnson Controls
Model	CK721-A
Category	Controller
Language	English