S300 Expansion Enclosures CK721-A Installation and Operation
3-26 24-10349-8 Rev. B
This document contains confidential and proprietary information of Johnson Controls, Inc.
© 2012 Johnson Controls, Inc.
The S300-RDR2 also provides two door input/output interfaces each consisting of:
 A two-state door monitor switch input (secure = normally closed)
 A two-state auxiliary access or exit request switch input (normally open)
 A door-strike relay (SPDT)
 An alarm shunt relay driver (open collector).
Table 3-12: S300-RDR2 Components
Component Description
J1 Reader 1 Connector
J2 Reader 1 Keypad Reader
J3 Reader 1 Two-Wire Wiegand reader Interface Connector
J4 Reader 2 Connector
J5 Reader 2 Keypad Connector
J6 Reader 2 Two-Wire Wiegand reader Interface Connector
J7 RS-485 Input
J8 RS-485 Output
SW1 Determines reader Address (refer to Chapter 4: CK721-A User
Interface)
System LEDs Indicates when data is transmitted or received and the
presence of 5 and 12 VDC, as labeled on
page 3-25.
U4 S300-RDR2 Firmware
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