On one of my large portable air compressors, there is a data port. They sell
an adapter cable for about $200 It adapts it to USB. The program that you use
to talk to it makes reference to modbus.
The data port has 4 pins. RJ-10 4p4c connector.
+5 with enough current to light an incandescent light bulb.
+5 low current
+5 low current
Ground
This sounds like USB host to me. One of my sons think it is RS-485
I don’t think USB would be happy on a RJ-10 and utp wire. Maybe it would.
Maybe I am just buying a piece of wire with two connectors on the ends.
The controller it plugs into is $2000 so I don’t want to experiment on that.
Be interesting to see the adapter cable when it gets here. See if there are
any active components. I would have probably just wired it up to a USB and
tried it if my son had not made the modbus/RS485 comment.
Any guesses?
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