
Section 16.0 Appendix G: HMI Modbus RTU COM Change Instructions HGA IOM
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16.0 Appendix G: HMI Modbus RTU COM Change Instructions
This document will outline to the user how to change the communication settings for the Modbus
RTU protocol enabled via COM3 on the HMI.
NOTE:
On the HMI, COM2 and COM3 share the same physical port, which is labeled COM2.
On the ‘Network’ page (Setup -> Tech Setup -> Tech Setup+ -> Network Setup) you can see the
current settings of the port. When selecting ‘HMI Settings’ and attempting to change these, you
will be prompted to call TCI. This document is intended to explain the process for changing those
settings once TCI has been contacted.
NOTE:
The text displayed on the ‘Network’ screen will not change as it is static.
1. Go back to the ‘Tech Setup+’ screen and select ‘HMI System Menu’.
2. Select ‘System Settings’ in the top left corner. Using the arrows scroll to the ‘COM Port’
tab.
3. Tap the screen and it will turn blue and a new set up commands will show up on the
bottom. Using the left/right keys, Select COM Port: 3.
4. Now using the arrow keys you have access to all the settings for the Modbus RTU
protocol. Change them to your preferred settings. The Comm. HMI Station is the slave
ID of the device. It is defaulted from TCI to be ‘113’.
A screen shot of the default settings for COM3 is shown below for reference.
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