I never noticed, but yeah the pinout for both looks identical. I wonder
if RS485 and USB have some shared heritage.
The converters are very small. It might be hard to tell the difference
between a slightly large plug package and a miniaturized electronic
package.....without cutting it open of course.
Here's one from Newark:
https://www.newark.com/productimages/standard/en_US/4817085.jpg
On 8/19/2020 12:26 PM, ch...@wbmfg.com wrote:
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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