Typical OSDP reader wiring
2.9 Input circuit wiring
Typically, these inputs are used to monitor door position, request to exit, or alarm contacts. Input circuits can be
configured as unsupervised or supervised. When unsupervised, reporting consists of only the open or closed states.
When configured as supervised, the input circuit will report not only open and closed, but also open circuit, shorted,
grounded*, and foreign voltage*.
A supervised input circuit requires two resistors are added to the circuit to facilitate proper reporting. The standard
supervised circuit requires 1KΩ, 1% resistors 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:
PLT-05249, A.1 10 August 2022
Powering
Trusted Identities
HID®Mercury™ MR62e OSDP Reader Interface
Installation and Specifications
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