[Elecraft] RTTY with K3

[Tom Fitzpatrick]

Trying to set up RTTY on the K3. Receive working fine using MMTTY. Hooked USB from computer through USB/Serial converter and plugged through an opto-isolator adapter to the ACC plug for FSK. It doesn't key the rig and no keying is coming through. I've tried 2 different USB/Serial converters. Seems I read somewhere there's a special one (expensive) that is the only one that will work?

Tom, K4IE