On 4/10/2022 at 2:26 PM, BruceMcF said:
a "proper" RS-232C connection
I've dealt with a whole bunch of improper "proper" RS 232 devices in my life. I use to have a book that was more or less a lookup/cross reference of a ton of devices to what their actual pin-out were so that a person didn't have to sit down a work one's way through. RS-232 was perhaps the worst standard in that no one checked/enforced compliance, unlike today where standards like USB make life vastly easier. Of course standards are changed/improved over time and fragment till the next one comes along to replace it.
I was once part of a company that was manufacturing a DTE device. The put one full serial port on it implemented in hardware, and a second one with only Tx, Rx and Gnd wired up. When a customer asked for a second full serial port, management came to the team and asked if it could be done by implementing it in firmware without redesigning the device/circuit board. ?
Anyway, for the hobbit who is running RS-232 over longer distances they would/should be aware that RS-232 isn't the ideal standard and choose devices/interfaces that were designed for the distance and the environment they are deploying in.
PS - yes, you choose your words carefully, but others are sometime vague or unaware.