Serial Port Debugger Window

This utility can be used when trying to understand and debug serial port communications. For example, you may need to figure out what prepend and termination strings to use for RFID readers, remote displays, temperature probes, etc. This utility is normally used by the person who is setting up your hardware and does assume a bit of advanced knowledge to use.

Connecting to the Device

When the window is first opened you will be asked to choose a port and set the other connection information. Check the user manual for the device if you are unsure about these settings. Once the settings are accepted you will see a window where you can either receive or send to the device. At the bottom right of this window is an Open Port button which you must click for the debugger to actually attempt to connect to the device.

If you receive an error message you may have some settings incorrect or you may have chosen the wrong port. Click the Port Setup button to go back and review these settings. If you need to, click the Refresh Port List to get an updated list of available ports from the operating system.

tip icon If the expected port does not show up here, it is either in use elsewhere in Fusion or by another application, or it is not set up such that the operating system recognized it.

Once the port is open you can either receive data from the device (RFID readers, temperature probes) or send data to the device (remote displays). You determine which mode the debugger is in by selecting the appropriate tab at the top of the window.


Once in receiving mode you can ask the device to send information and it will appear in the window. For example, with an RFID reader you would need to scan a tag and when you do so it should appear in the window. (It is very important that you make sure the reader isn’t in a mode where it doesn’t send duplicate tags. If you are unsure about this, make sure you use a set of tags that you know haven’t been scanned with the device before.)

As the device sends information you will see it appear in the text box. If the device sends a character that cannot be directly displayed, the ASCII equivalent will be shown enclosed in less than/greater than signs like this: <13>. To continue with our example, to set up an RFID reader correctly you must know the termination string. If you use this utility to receive a few tags you will see some hidden characters between each tag.

If you saw 124000123456789<13><10>124000564894326<13><10> then you would know that the termination string setting needs to be 13,10.

Below the box where received characters are placed are several buttons:


You can use the sending tab to send characters to a device like a remote display. This part of the tool is probably a less useful way to test remote displays as it is usually easier to just use the scale system. However, in some situations it might be useful. There are four ways to send characters to the device:


If you click the Diagrams… button, Fusion will show some common serial port wiring examples.

Getting Here

You can open this window by going to Fusion Admin → Utilities → Serial Port Debugger, Fusion Chuteside Main Menu → Options → Serial Port Debugger, or Fusion Truck Main Menu → Options → Serial Port Debugger. (Fusion Installer also has this window built in so you can use it from there as well.)

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