CH340 USB-TTL problems.

Author	Message
TassyJim Guru Joined: 07/08/2011 Location: Australia Posts: 6541	Posted: 07:12am 11 Aug 2023       I use CH340 USB-TTL modules a lot. They have been reliable and easy to drive. Until now. I discovered that MMEdit no longer liked some of my modules. TeraTerm was OK but not MMEdit. The module in question is this one. The description on one local suppliers web site is:   Quote   CH340G USB A to serial adapter module, ideal for interfacing a USB to a micro-controller serial RS232.  USB power can be set to either 3.3 or 5vdc with an onboard link.  Uses a clone CH340G chip that is fully supported by most computer operating systems. Please Note: that there are reports that some newer drivers many not work on all operating systems. They work OK on my W10 PC but not my W11 system. Linux seems OK I did work out a fix for MMEdit fortunately. I open the port as 2400 baud first then close the port and reopen at the required speed. So far that has been reliable. Buyer beware... Jim VK7JH MMedit