Hello, I have been developing a universal radio interface that can do Cat control and sound card etc.
I am using a Silicon systems CP210x type USB to serial chip along with CM108 for sound. Using an FE1.1s USB2 hub chip to distribute the USB. I noted that if you have cat running on one serial port and using another to key the PTT via RTS or DTR is where I note something odd. When running the PTT test it will key the RTS and then never release it. The pattern changes if you have PTT and RTS keying off the same chip. When it is like that it works OK. It's like the port is not being refreshed or unset after asserting RTS when running in a split mode. I had Com 18 as CAT and com 19 keying RTS for PTT. This way it never de asserts. Running PTT via RTS (com18) while the cat is also running on com 18 for instance, things work OK. DTR is another mystery. It pulses quickly and that's it. Sometimes in High RF environments, I like to have the PTT done by RTS / DTR so tha the transceiver does not get stuck in TX if the cat commads get hung up for some reason. Normally I run TX via cat but noted this anomaly. Have you seen this before? Thanks, Simon ZL1SWW / ZL1EW.
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