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Reassigning COM ports under CommandHMI for a project created under HMITool
When you switch from an older generation HMI to the new HMI, the COM ports may not be assigned to the correct port number.
Or you may need to change the COM port for a project, for example if you want to switch from USB port to RS232 port.
Download and open the new CommandHMI programming tool
- Load the original project created with HMITool
- Let us consider the case of an HM 043AE screen being replaced by an HM 043U2S.
- Change the screen model in the settings
Reassigning COM ports
The new screen will have one or more communication ports assigned by default, which may differ from the original, even if the input does not physically exist on the HMI!
Locate your old COM/USB port
Check which COM/USB (Link) port your old communications were assigned to, for example USB Link 1, by editing data exchanged with the ACE PLC. Here, they are now on COM3, even though COM3 does not physically exist on the HM-043U2S, but that’s no big deal…
Here, your old project is on COM3 port
Add your new COM/USB port
As Link 1 is already assigned, we must declare another one, which will be Link 2 or any other name, with the same protocol.
Reassign the old COM port to the new one
On the left-hand side, you can see where the communication is currently located: COM3 Link 1
On the right-hand side, we need to define the new connection: USB Link 2
Click on “Interface port address change”
The system will update all addresses for USB link 2
Check the address of the same entry as before : Everything is fine, she is definitely on USB Link 2!
