Usually those kind of converters have some kind of charge pump inside capable of providing around +/- 10V. This should't be a problem for any RS232 device. However, I found by experience that sometimes some converters do not perform as they should for some baud rates. Once I had a device at 19200baud and I was having trouble in the receiver, had to change the baud rate to 9600 to get a stable connection.
Yes there is true USB RS232 converter with full RS232 signaling, also for laptops/notebooks you can buy extension cards with true RS232 ports.
Ok, but one I have is based on PL2303 chip and it doesn't work. I have to make second check.
What do you mean ? Sorry I didnt catch concept of this post.
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