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? > -- > AF mailing list > AF@af.afmug.com > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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