HI everyone,
I have a small challenge: I have a long multicore cable (assuming shielded) that goes through a building (say 100m).
That mutlicore only carries some 110VDC voltages and low currents (for buttons, switches, indicator lights).
Now I would need to send some data from a sensor through some of the unused spare cores of this cable.
The bandwidth can be very low but I need to reliably get the data without risking introducing big issues in terms of EMI.
Since the cores are not twisted, RS485 may not be suitable so I was wondering if there was any existing transceivers for this type of low bandwidth data transmission across non-ideal cables.
I was thinking about some very low frequency frequency modulation carrier could work but I'm not even sure anything like this is even workable.
The sensor would be queried every few seconds and just needs to return a measurement.
Surely I'm not the first facing this problem, I'd rather not have to pull cables
Thanks for any pointers!