Communications Overview; Modbus Communication; Control Registers; Commands - Mantracourt T24 User Manual

Communications Overview

MODBUS Communication

The T24-GW1 operates on Modbus RTU communication 8,N 1 ( 8 data bits, No Parity, 1 stop bit). The following
Modbus Function codes are supported
Function 03 'Read Holding Registers'

Function 06 'Write Single Register'

Function 16 'Write Multiple Registers'

The gateway has a single modbus address, 1 is the default address but this can be changed via register 41001 or
via the T24-Toolkit.

Control Registers

41001 – Read / Write
Set the MODBUS slave module ID, module ID will be 1 as default. Valid values 0-255.
41004 – Read / Write
Set to the T24 RF channel the gateway is working on. Valid values 1-15.
41005 – Read / Write
Set to the number of cells to be programmed into the table of data tags default = 0. Valid values 0-100
41006 – Read / Write
Set the Time out Value (seconds), if a channel does not update with in the timeout time the value register will be
set to either the default value or last value received, see
41007 – Read / Write
Set the Sleep time (seconds), this is the period for which the gateway will sleep any module it sees after the
broadcast sleep register (41002) has been set to 1. The T24-GW1 will only sleep modules listed in the Data Tag
registers. Valid Values 0-255.
41008 – Read / Write
This register Enables or disables the functionality to keep awake the modules specified in Data Tag Registers.
Valid values 0 or 1.

Commands

Writing a 1 to the following registers will execute the following commands:
41002 – Read / Write
Set to 1 to perform broadcast sleep to all modules, it will set back to zero when the sleep timer value has been
reached.
41003 – Read / Write
Set to 1 to perform broadcast wake to all modules, it will set back to zero when the waker duration has been
reached, the default waker duration is 12 seconds but can be set using the T24-Toolkit, see
Settings.
41009 – Read / Write
Set to 1 to perform module save to save all the current settings and data tags in the module. It will set back to
zero once the save is complete.
Mantracourt Electronics Limited
Toolkit – General Settings. Valid values 0-255.
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Toolkit – General
T24 Telemetry User Manual