How to identify you COM port (PC Version)

Although this document has been written for Windows 7, later versions are very similar, and the bulk f the instructions will still work fro Windows XP.

In order for this all to work you must follow every step. The vast majority of issues reported are related to not following the instructions, missing drivers, or missing out steps.

Before starting

  1. You must have installed the drivers for the USB interface. The latest drivers are available from the Digital Interface page. Drivers are available for Windows 7, 8,8.1 and 10 as well as for OSX. Most modern distributions of Linux will already have the drivers installed.

  2. You must connect the Digital Interface Cable to a spare USB on on your computer. If you do not have the cable connected to a USB socket connected to your computer, then your computer will not be able to identify which port the Digital Interface cable is assigned to.
Windows Start Menu

On you Windows 7 PC

  1. Using you mouse, click on the Windows 'Start Menu' which can be found towards the bottom right of your screen.

  2. You should now see the standard windows 'Start Menu'.

  3. Open Computer Management Window

    Windows 7 Computer Management Window
  4. Now right click on the option marked 'Computer' and select 'Manage' from the choice of drop down options. You should now see the Computer Management Window.

  5. Open Device Manager

  6. Click on the "Device manager" option in the left hand window pane, and you should now see Ports (COM & LTP) appear as part of the list in the right hand window. If you do not see Ports (COM & LTP) in the list, then either the interface cable has not been connected, or the drivers have failed to install. Ports (COM & LPT) will only display if you have a COM port or LPT port installed. (LPT ports refer to parallel printer ports - but you do not need to worry about them in this instance).

  7. View available Ports

  8. Windows - View Available PortsIf you can see Ports (COM & LPT), then click the little triangle to the right of Ports (COM & LPT), or double click on Ports (COM & LPT), and you should how see all of the ports installed on your computer drop down as part of a tree display.

  9. Com Port Properties

    Windows Com Port properties
  10. If you have more than one COM port installed then you might see more than one COM port listed, If this is the case you will just need to work your way down the list and record which ones seem likely to be associated to your Digital Link Interface.
  11. Double click on the USB Serial port shown, (in this demonstration case it is COM18, but yours may well be different) and you should now see the property window for that port.
  12. Check that the title shows the COM port, and the Manufacturer shows FTDI as well as the device status showing as "This Device is working properly". If it shows another manufacturer then you might be looking at a different interface. A correctly installed driver and an official E-Stim Systems Digital interface will show the manufacturer as 'FTDI'


If you don't see the Digital Interface, or if you don't see Ports (COM & LTP) in the list, then either the cable is not correctly connected to your PC, or the drivers have not installed correctly.

E-Stim Systems Ltd
Page Last updated 26/12/15

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