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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 numbers.
Or you may need to change the COM port for a project, for example if one of the ports has become faulty.
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!
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…
As Link 1 is already assigned, we must declare another one, which will be Link 2 or any other name, with the same protocol.
All that remains is to transfer the communications from COM3 to the USB port, right-click on COM1 because COM2 and COM3 are not available, but it still works…
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!
