CKM-MR52-S3 Hardware Installation Manual
24-10707-198 Rev. –
6
Alarm Contact Wiring
There are 8 inputs that are typically used to monitor door position,
request to exit or alarm contacts. Input circuits can be configured as:
• Unsupervised alarm (2 states); reporting as open or closed contact.
• Supervised alarm (6 states); reporting as open or closed contact, open
circuit, shorted circuit, grounded circuit *, or foreign voltage*.
A supervised input circuit requires adding two resistors with value of 1k
Ohm, 1% to the circuit to facilitate proper reporting and should be located
as close to the sensor as possible. Custom end of line (EOL) resistances
may be configured via the host software.
* Grounded and foreign voltage states are not a requirement of UL 294
and therefore not verified by UL.
The input circuit wiring configurations shown are supported but may not
be typical.
Figure 7: CKM-MR52 Alarm Contact Wiring
There are two additional inputs for monitoring cabinet tamper (TMP) and
power failure (PFL). These two inputs do not use EOL resistors and are
for contacting monitoring only.
Control Output Wiring
Six form-C contact relays are provided for controlling door strikes or
other devices. Load switching can cause abnormal contact wear and
premature contact failure. Switching of inductive loads (strike) also
causes EMI (electromagnetic interference) which may interfere with
normal operation of other equipment.
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