Communication Wiring - HID Mercury LP1501 Installations And Specifications

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2.8 Communication wiring

The LP1501 controller communicates to the host via the on-board 10-BaseT/100Base-TX Ethernet interface.
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-05243, A.1 13
HID Mercury™ LP1501 Controller
Installation and Specifications
June 2021