Honeywell XNX Universal Transmitter Modbus Board

What safety precautions should I take when handling the Modbus Board?

Handle the board by its edges only and avoid touching electronic components directly to prevent electrostatic discharge (ESD) damage. Wear grounded wrist or foot straps, ESD shoes, or heel grounders to dissipate static energy. Prior to handling, neutralize any static charge in your body or equipment, and store components in static-safe packaging.

How do I install the Modbus option board into my XNX transmitter?

First, remove power from the XNX unit and use a 2mm hex key to unscrew the cover. Slide out the POD, place it face-down on a flat surface, remove the back cover, and insert the option board pins into the connector on the main board. Reassemble the POD, apply anti-seize compound to the threads, and reinstall it into the housing.

What should I do if the XNX displays Fault 152 after installing a new option board?

Fault 152 indicates the need to configure the new option board. Navigate to the Transmitter Data screens under the Information Menu, access the Option Revision screen using the switches, then swipe the magnetic switch on the front panel to display the Accept New Option Screen. Highlight the new option and swipe the magnetic switch to accept the change.

What is the Modbus pin configuration for the termination switch?

The Modbus termination is provided by SW5 with a 10-pin configuration: pins 1-2 are +, pins 3-4 are –, pins 5-6 are A, pins 7-8 are B, and pins 9-10 are S. This termination is required for proper Modbus operation.

Can I install the Modbus option board while the XNX is powered on?

No, you must remove power from the XNX unit before retrofitting an option board to prevent potential electric shock. Always power down the device before beginning the installation process.

Is the Modbus option compatible with all XNX configurations?

No, the Modbus option is not available with the Relay or Foundation Fieldbus options. It can only be used with certain XNX configurations that do not include these alternatives.