It is a way to get in and set parameters and options, like remote start or
remote loading.
From: Cameron Crum
Sent: Wednesday, August 19, 2020 1:57 PM
To: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] OT odd data connection
Just curious what kind of data you need for an air compressor?
On Wed, Aug 19, 2020 at 11:51 AM TJ Trout <t...@voltbb.com> wrote:
apc uses rj10's for usb..
On Wed, Aug 19, 2020 at 9:46 AM Ken Hohhof <af...@kwisp.com> wrote:
Apparently modbus is a data protocol, not a physical layer standard, but
yes it could go over RS485. I don’t see how a simple cable could convert from
USB to RS485. I sure hope for $200 you are getting a dongle, not an expensive
cable.
The connector you are referring to, is that a 4 pin modular plug, like used
on the handset cord for a phone?
From: AF <af-boun...@af.afmug.com> On Behalf Of ch...@wbmfg.com
Sent: Wednesday, August 19, 2020 11:27 AM
To: af@af.afmug.com
Subject: [AFMUG] OT odd data connection
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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