Hi Colin, > On 25/06/2015, at 1:44 am, Colin Reese <colin.re...@gmail.com> wrote: > > 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.
Is the Arduino the Slave or Master Modbus node in this instance? If you don’t mind sharing the code then I’d take a look at it and maybe use parts of it. I had wondered about making a Arduino 1-Wire Slave device using one of the emulation libraries and still might do that - not sure which way to jump yet. One good thing about making an Arduino 1-Wire slave is I can do a few other things with the Arduino like make a bit of a Watch-Dog and if I don’t hear from the 1-Wire Master for a while, I could change the PID Controller SV to a lower/safe value if the heat load (House) has gone. The PID controller has 2 SV values and they can be selected by a 5V digital input on the back of the PID controller. The other option is to write some glue code (python maybe?) that is a Modbus Master that sits between the PID Controller and talks to it via RS485/Modbus and the owfs Server on my linux box. I still could add the Arduino as another Modbus Slave as well. I was wondering if I used the owfs option: --fake=devices on owserver and created a device that I was then able to update the value of via the OWNet python API. Regards Alex Shepherd ------------------------------------------------------------------------------ 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
