I have an engineering sample tablet PC that runs Windows XP. This tablet has a serial port to connect to devices like legacy serial printers.
The problem I am seeing is that as soon as the tablet gets into windows, it sets the TXD and RTS pins to a high logic level (+6V, approximately).
If I boot into DOS from a bootdisk, the logic stays at low levels (-6V)
Is there something in windows that configures the serial port at boot up?
I'm thinking this might be an oversight by our manufacturer.
Thanks!!!
The problem I am seeing is that as soon as the tablet gets into windows, it sets the TXD and RTS pins to a high logic level (+6V, approximately).
If I boot into DOS from a bootdisk, the logic stays at low levels (-6V)
Is there something in windows that configures the serial port at boot up?
I'm thinking this might be an oversight by our manufacturer.
Thanks!!!