I recently wrote a simple software serial modbus master for use with an arduino attached to an rs485 transceiver, the max3485 IIRC. Not sure what you're talking with, but this is useful if you've got a serial port available. Haven't quite gotten around to writing it up but it's here.
C > On Jun 24, 2015, at 4:33 AM, Alex Shepherd <list...@ajsystems.co.nz> wrote: > > Hi Guys, > > I’m in the process of upgrading my heating control system system that > controls a Wood-Fired boiler that provides hot water for in-floor (concrete) > heating. I’m now using a standalone Autonics TZN4M-BC4 PID controller that > has a RTD temperature sensor and 4-20mA output driving a Johnson Controls > 0..90 deg positioner that controls the air inlet damper. I’m hoping this will > provide a higher degree of control and better fail-safe capability as I did > have a bit of a disaster last year… > > The PID controller also has a RS485 comms port that talks a limited subset of > the the Modbus protocol, but enough to read the PV and read/write the SV. I’m > not sure if I can get anything else as that is all the example .Net code > shows. > > Previously I had a DS18B20 sensing the temperature at the boiler and was > recording that value using temploggerd. Now that I no longer has the DS18B20, > I’m wondering if there is a way to re-inject the temperature from the PID > controller (if I can get it via the RS485 link using python say) and then > somehow writing it into the previous (or a new) device node so it keeps being > logged by temploggerd? > > Any suggestions? > > Regards > > Alex Shepherd > Hamilton, New Zealand > ------------------------------------------------------------------------------ > Monitor 25 network devices or servers for free with OpManager! > OpManager is web-based network management software that monitors > network devices and physical & virtual servers, alerts via email & sms > for fault. Monitor 25 devices for free with no restriction. Download now > http://ad.doubleclick.net/ddm/clk/292181274;119417398;o > _______________________________________________ > Owfs-developers mailing list > Owfs-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/owfs-developers ------------------------------------------------------------------------------ Monitor 25 network devices or servers for free with OpManager! OpManager is web-based network management software that monitors network devices and physical & virtual servers, alerts via email & sms for fault. Monitor 25 devices for free with no restriction. Download now http://ad.doubleclick.net/ddm/clk/292181274;119417398;o _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
