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Keltron's PET402 is one of a series of distributed-multiplex, addressable transceivers that provide a low cost and reliable method of protecting a wide range of proprietary, commercial, and industrial buildings and complexes.

The PET402 is especially appropriate for use in campus environments and industrial complexes because it enables reliable use of existing wire and wiring topologies for all communication between modules and the central monitoring host. The PET402 module and the FACP may be located up to several miles apart when using an optional modem.


Reliability- high-performance error-detection during serial, multiplexed signal transmission

Low cost - retransmits serial data output from multiple FACPs with a cost saving wiring flexibility

Flexibility - compatible with multiple FACPs from different manufacturers >


Compact and easy to install

Contains both serial alarm input circuitry and full RS485 signaling circuit capability

Contains two independent RS485 ports that each regenerate and retransmit signals

Branching minimizes wiring and allows miles of distance capability

NFPA 72 signaling line circuit classes A or B to style 7

Wide range low power input - 17.6V at 80mA

Serial data input RS-232C with software and hardware handshake

Communications link is supervised when supported by the monitored FACP

Runs from FACP power with no compromise of ground fault detection

Enclosure may include optional tamper switch whose condition is reported to the host

PET402 Specifications >

Download data sheet >

Operates in conjunction with UL-listed Keltron DMP703-704 systems which can monitor over 500 PETs

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