The Valon 5009 has some interesting and novel features. For example, there are two serial ports available. One, micro-USB, the other a 3V TTL. You can use them both at the same time. Since it is a dual synthesizer, you could use the USB serial port to control the Source 1 frequency and use the TTL port to control Source 2 frequency.
The 3V TTL serial port uses a small Hirose connector and was intended to allow users to control the synthesizer in an embedded application directly from a local microcontroller. The 3VTTL serial port shares the User Port with the List Mode control.
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Network USB Adapters
We have checked out the Belkin F5L009 with the Valon 5009 synthesizer and had no problems running either the GUI or the terminal program over the LAN/USB connection. If you have discovered other adapters that work for you, please let us know.