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Since you have a Power Pro, the instructions differ:

Irrespective of DCC system, there are some basic rules for troubleshooting any USB-attached device to a Mac.

Plug your device into your Mac.

Go to "System Information" from Apple Menu->About This Mac->More Info->System Report.

Look in the USB section, expand all sections under controllers and hubs and see what devices are present.

Unplug your device, select Refresh from the System Information menus and see what device has disappeared. Plug your device back in, refresh again and see what reappears. Repeat until you see what is changing. If there is no change, there must be a hardware problem external to your Mac, such as a faulty USB cable, connector or device and there is no point going any further until your Mac can see the physical device.

Once you have seen the device in System Information, you will quite likely have to install Mac drivers for it (although some do not need extra drivers, see your documentation). If unsure, try the next step anyway. The System Information should give you the Manufacturer.

In High Sierra, you must open System Preferences->Privacy and Security and allow the kernel extensions (drivers) you installed to be loaded, or they will not be used.

Unplug your device. Open a window of the Terminal utility (from /Applications/Utilities), copy and paste the following command in EXACTLY (including spaces and punctuation) then press Enter.

while : ;do clear;ls -lt /dev|head;i=$((i+1));echo $i;sleep 1;done

This command should show about 10 lines of output and then sit looping, with a counter incrementing every second.

Plug your device back in and wait a few seconds. Two new items with names like cu.xxx and tty.xxx should appear in the list. They should disappear if you unplug your device. If this does not happen, you do not have the correct drivers installed for your device and you will need to solve that before proceeding further. Once you have found your device, write down the name you see.You want the cu.xxx version not the tty.xxx version.

If you have got this far you know your device is be being seen by the Mac, that it has a matching driver installed and the name of the connection port "cu.xxx" you need to select in JMRI. If you cannot get this far, there's no way JMRI can find your device until the driver issue is resolved.

1) JMRI Settings.
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The correct JMRI settings for a recent Power Pro are:
System Manufacturer: NCE
System Connection: Serial
Serial Port: <the name you determined above>
Connection Prefix: N (default and recommended)
Connection Name: NCE Power Pro (recommended name).
Additional Connection Settings: ticked
Baud Rate: 9600
Command Station EPROM: 2006 or later (unless you have an old system)

2) Connection to the Power Pro serial port.
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The Power Pro front panel is quite a heavy gauge. Because the socket is behind the panel and the retaining binder posts are in front of the panel, a normal serial connector cannot seat correctly in the socket (the pins barely engage). The result is an unreliable connection.

This link explains the problem and fixes, with actual photographs.
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To see if this is the problem, you need to remove the top cover of the Power Pro box and carefully unscrew the hex binding posts from the front, ensuring you do not push hard against the socket and that nothing comes loose inside. You then need to carefully push the connector in WHILE holding the socket against the front panel from the rear (to prevent stress damage to the connector solder joints or the circuit boards.

If this fixes the problem, file or grind down the tops of the hex binding posts so they no longer push the connector away.

Please report back exactly how far you get.
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Dave in Australia