What is ttl2usb?
TTL in electronics speak is Transistor to Transistor Logic. USB is short for the Universal Serial Bus. In the last few years there has been a push from PC manufacturers to move away from the DB9 serial ports of the past and only offer USB ports. As most modern electronics don't rely on a DB9 serial connection this is generally not a problem. However, if you are trying to connect an older device or a proprietary device that only has a DB9 serial connection, this can be a problem.

There are plenty of USB to DB9 serial adapters on the market, unfortunately most of these generic adapters don't play nice with proprietary interface cables. To add to the complication, they can cost almost as much as the proprietary interface cable itself. You spend twice as much as you planned and end up aggravated because it doesn't work as easy as you thought it would.

When we attempted to interface a PC without a DB9 serial port to a Yaesu VX-7R radio, we scoured the internet looking for a cable, but came up with nothing. That is when the idea to build a USB interface was hatched. Using our extensive background in building scientific measurement devices that use USB, we designed a solution that is cheaper and easier to use than anything else on the market.