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Close, Andrew - it was a PDP-8, during my first job out of university, where I was responsible for the design of a hardware interface betweel an Elliot hight speed paper tape reader and a General Automation SPC-16 minicomputer, part of a Post Office modem-based data transmission system aimed at indu...

Thank you Andrew. I'm still waiting for an opportunity to try out my unit again... Can you tell me whether the module itself cares about parity, and whether all characters are 8 bits? Way back when I worked on GPO 1200 bps modem type data comms, teletypes, and what were once called VDUs or terminals...

Thank yuou Andrew. Just to be clear, can the commands to clear the pairing come from the phone terminal app or must they come from the module TXD pin?

One more thing: will the device remember the pairing when powered down? If not, I presume we repeat the process. If yes, how do I change the pairing later?

Thank you, Andrew, I'll try that tomorrow.

This module is described as " a serial communications port (default is 9600 baud) over a Bluetooth wireless connection with no software configuration". As a hardware engineer I equate that to a UART. I've tried talking to it with a terminal app in my phone but it doesn't show any activity. I don't w...