MODBUS CLIENT LITE allows Q-SYS to interface with external Modbus Server devices over standard TCP/IP communication. This allows Q-SYS to receive inputs and control outputs of automation equipment that supports the Modbus over TCP protocol. This can greatly expand the IO capabilities of a Q-SYS system by allowing both digital and analog signals to be easily integrated into a design.

This LITE version of the plugin offers the base functionality of reading hardware inputs and writing hardware outputs with a limit of 16 inputs and 16 outputs. Both Input and Output Bits are represented as toggle buttons for easy control pin wiring. Registers are represented as integer fields with possible values from 0 to 65,535, and as hexadecimal string fields with values from 0x0000 to 0xFFFF.

The Modbus Client Lite is a slimmer version of the fully-featured Modbus Client plugin. The table below compares the features between the two versions.

	Modbus Client	Modbus Client Lite
Maximum Inputs (bits registers)	999	16
Maximum Outputs (bits registers)	999	16
Minimum Polling Frequency	30 Hz	8 Hz
Output Sync
Overrides
Plugin Instances Allowed	unlimited	1

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File Type:   Encrypted Q-Sys Plugin (QPLUGX)
Current Version: 1.3.0
Release Date: October 15, 2025
Compatibility: Q-SYS Firmware v8.0 and up
Additional Information:
See the Plugin Guide for more information