On Monday 08 December 2003 03:59pm, Alessio Sangalli wrote:... if I connect a usb-serial adapter to my laptop, and I connect to this adapter an external serial modem, everything's perfect. But, if I connect another device, for example a telescope, (which happens to have only 3 lines connected, TX, RX and GND) I can't send or receive anything. The same hardware works well in windows and I can access the telescope using minicom on a desktop computer with a real serial port.
Do you perhaps think that, the pl2303 doesn't work well with devices that implement a 3-wire only communication? Is there somothing to do?
This sounds (almost) exactly like the problem I had with the Belkin F5U109 USB/RS-232 adapter.
In short, output data gets held up in the USB/RS-232 adapter for RS-232 devices which don't assert the 'CTS' signal.
...
If this is the problem you can try to build a "special cable" that shorts RTS/CTS and DTR/DSR on the PL2303 side (pins 4-6 and 8-7), and connects directly TX, RX and GND (pins 2,3,5).
This way the device gets is own handshake. This is a simple test that can verify the source of the problem, or even solve it if you're happy with the solution :)
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