Nu-Star interface with WashMax

Overview

The Nu-Star Comet II model can report a few faults to WashMax via simple relays.

Hardware

The hardware needed is a Kit 108 I/O Relay Board connected to a Serial Device Server such as the Moxa NPort. These can be mounted in an Activa base along with a network switch. A diagram at the end of this article shows how to wire the I/O relay board to the Nu-Star PLC.

Serial Device Server configuration

When using a device server (ex: Moxa nPort), it must be configured as:

Run as a TCP Server listening on port 4001.
Serial side set to 9600 baud, 8 bit data, 1 stop bit, no parity, and no flow control.

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