[RTTY] Startech USB COM port adapter

[William K Carr III]

I have a Startech ICUSB2324X USB to 4 COM port adapter that I want to use with N1MM+ and the MMTTY engine to key FSK and PTT through the W1AN interface that plugs into the DB15 connector on my K3S.

This Startech adapter was recommended by a local RTTY contester who uses it without problems on Windows 7. I'm using Windows 10 64 bit.

The drivers installed OK and I have 4 active COM ports (5, 6, 7 and 9) in Device Manager. I decided to get this working with MMTTY by itself before loading the MMTTY engine with N1MM+.  I have COM5 (first port on the Startech box) cabled with a straight thru cable to the DB9 end of the W1AN adapter. When I set MMTTY Options TX for FSK and select COM 5 and hit OK, MMTTY throws an error that says it can't open COM 5. Changing to another COM port gets the same result.

Now here's the weird part. I configured MMTTY and the K3S to use the USB sound interface built into the K3S, and that works fine with AFSK. I left the serial cable connected. However, when I transmit, I noticed that the PTT line on the W1AN adapter is activated by MMTTYand keys the K3S!! The red LED on the adapter is on.  If MMTTY can't open open the designated COM port, how can it toggle RTS?

Anyone have suggestions on how to get this working or experience with the ICUSB2324X adapter?

Kim  K5TU




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