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