typically how you talk to solar charge controllers...
On 8/19/20 5:40 PM, Mark Radabaugh wrote:
Cool - it’s still around: https://modbus.org/docs/PI_MBUS_300.pdf
ASCII is easy to build, RTU a little tougher due to the timing
requirements.
This brings back some memories… probably happily forgotten.
The protocol was originally designed for talking to Modicon
Programmable Logic Controllers. The documentation has lots of
references to specific controllers like 384, 484, 984, etc.
Read Coil, Read Input, Force Coil, etc. all refer to reading or
setting an individual real world input/output or storage bit on or off.
Registers are words (integers normally, but can be anything).
You need detailed descriptions of the mapping of addresses on the
devices you want to control to be able to understand what you are
controlling.
Mark
On Aug 19, 2020, at 7:45 PM, Matt Corcoran <m...@stratospeed.com
<mailto:m...@stratospeed.com>> wrote:
Not quite related, but I just found out that Microtik(linux) has
built in drivers for common Arduino serial chips. I setup an
Arduino to monitor 4 different voltages at our solar site. Our NMS
just SSHs to the microtik(special login) to pull the average voltages
and graph them. I was happy to not add any more equipment other
than the power sipping Arduino.
*Matt Corcoran* | Network Engineer
m...@stratospeed.com <mailto:m...@stratospeed.com> | 231-680-0062
<image001.png> <http://stratospeed.com/index.html>
www.stratospeed.com <http://www.stratospeed.com/> | 231-774-2112
*From:*AF <af-boun...@af.afmug.com <mailto:af-boun...@af.afmug.com>>
on behalf of dave <dmilho...@wletc.com <mailto:dmilho...@wletc.com>>
*Reply-To:*AnimalFarm Microwave Users Group <af@af.afmug.com
<mailto:af@af.afmug.com>>
*Date:*Wednesday, August 19, 2020 at 4:19 PM
*To:*"af@af.afmug.com <mailto:af@af.afmug.com>" <af@af.afmug.com
<mailto:af@af.afmug.com>>
*Subject:*Re: [AFMUG] OT odd data connection
Ive done alot with Modbus on arduino products interfacing with
anything that speaks modbus.
I have a server I que or add each thing I want to monitor or review.
Temps, Humidity power levels or presence of are the main ones.
<image002.jpg>
On 8/19/20 11:26 AM,ch...@wbmfg.com <mailto: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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