Every cheap "Serial to USB" adapter I can find uses a PL2303 chip with active low signaling, which isn't the same as a real PC serial port. Fortunately FTDI sell real adapters. The US232B has 9V high, -9V low outputs and its inputs are open low at 0V.

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This page contains a single entry by Simon Arlott published on August 7, 2010 15:15.

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