Vic
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Ignore JMRI for now. Once the correct COM port is known you can attempt to use JMRI.
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Make sure the old DCC++ system is unplugged, and don't plug it in yet. Also make sure the new DCC-EX system is unplugged for now.
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Now open Device Manager and look for the Ports section. Expand that to list your Ports currently in use (if any), then plug in your new DCC-EX system. If Windows recognises it, a new Port will appear, and will have a COMx number (not necessarily COM3 or COM4). Unplugging your DCC-EX system should cause that port to disappear from the list. If you have confirmed a port number for your DCC-EX system this way, use that port number in JMRI.
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You can repeat that test then with your old DCC++ system to find the port assigned to it.
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If you want both connected at the same time, then they must have different port numbers, and I believe JMRI must be set to use each one for specific actions (such as main track and programming track)
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If no port appears when you plug in your DCC-EX system, then you need to check the following list identify the cause:
- Is the USB cable faulty? Try another cable.
- Is it a problem with that USB port on the laptop? Try using a different port on the laptop.
- Do you need to install or update drivers to recognise the new Elegoo Mega? Look for a device appearing in the 'Other' section of Device Manager.
- Can you try your DCC-EX system on another PC? The port number will almost certainly be different to your PC but at least this would confirm if your DCC-EX system is working.
Good luck.
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Cheers,
Trevor
