Unable to connect pololu serial transmitter to mini maestro

I need to use the serial transmitter to test some specific UART commands. Here is the issue –

  1. I downloaded the pololu serial transmitter v1.3 from your website
  2. I try to connect this to the 12-channel USB servo controller (command port as well as TTL port)
  3. The transmitter programmer gives an error – unable to open port COM3 (COM4)

I am able to use the servo board correctly using the “maestro control center”. Please help.


We received a separate email from you letting us know that rebooting your system solved the issue. I am posting your solution here in case it helps another members with the same issue.