Can I (mis-)use my USB-to-parallel (printer) cable as UART cable in some way (e.g. sticking some cables in the female parallel output and use them as UART connectors)?
closed as off-topic by Marcus Müller, Bruce Abbott, Dmitry Grigoryev, Michael Karas, Voltage Spike Jan 4 '17 at 17:00
This question appears to be off-topic. The users who voted to close gave this specific reason:
- "Questions on the use of electronic devices are off-topic as this site is intended specifically for questions on electronics design." – Marcus Müller, Bruce Abbott, Dmitry Grigoryev, Michael Karas, Voltage Spike
The parallel port connector has pins designated like this: -
And, here's an example of where D2 is used for driving a BJT: -
This basically informs us that the data lines can generally be used as IO lines providing the host has the software to support this. This can lend itself to a form of serial comms (similar to UART) but it will be totally reliant on dedicated software loops reading the data pins. In other words, it doesn't have the specific hardware chips to inform the host that a new byte has arrived and that byte has no detectable errors and all the other bells and whistles you get with those specific UART chips.