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Hi all. I'm looking at upgrading my Arduino controlled 2axis solar array. I have the Arduino controlling the panels with a few yearly adjustments manually changed. I'd like to upgrade the system to a Jazz if possible as we have played around with them a bit before and Unitronics hardware is more robust. We have a JZ10-11-R31 Question is I have an algorithm the tells me the position of the sun using a RTC which outputs Altitude and Azimuth and the array goes to that point, how do I go about using complex math like this in U90. ie sin, cos, tan? Can I import a C+ formula to use? Or do you know of someone who has done similar? Any help much appreciated

Hi. I have a Unitronics JZ20-R16 (Jazz2) controller I’ve programmed to run a simple air ventilation system in my house (The thing is running great btw.). I also have a self made Arduino based data logger (I use it to monitor and log my energy consumption, temperature, etc.) I’m not building those things or mass producing, Arduino electronics is my hobby - I just use it to stay sharp. So I decided to cross-integrate my air vent. Controller with my data logging unit (I want to see the status of my air vent. Controller unit on Arduino). So for starters the task is to simply send a 16bit int to Arduino and receive another 16bit int from the Arduino. The communication protocol of the choice was MODBUS through RS232 interface (as I already have MJ20-PRG; MJ20-CB200 and a MJ10-22-CS10). I’ve decided to use JZ20-R16 as a Master (Arduino as a Slave) in a 9600 baud 8N1 configuration (default for JZ20-R16). For Arduino’s RS232 interface I’ve used TTL-RS232 converter (MAX3232 based) : Experiment 1: In order to see if the Arduino’s MODBUS feature is working I’ve connected Arduino to my PC using the given connector and a RS232-USB converter. Arduino was configured as a slave and ModbusPoll software (http://www.modbustools.com/modbus_poll.html) simulated a master. I was able to both read a holding register from Arduino (03) and also write a register (06). Those are the desired options. Experiment 2: In order to see how MODBUS is working on JZ20-R16 I’ve hooked it up to my PC using my MJ20-PRG; MJ20-CB200 and a MJ10-22-CS10 later connected to RS232-USB converter. I’ve uploaded a program (by pressing buttons 1 and 4 I send an int or correspondingly request an int from slave): (see in uploaded files) It make the JZ20-R16 work as a Modbus master on a RS232 interface. In order to simulate a slave I’ve used ModbusSlave software (http://www.modbustools.com/modbus_slave.html) . Once again, the combination worked perfectly. Once again all the required commands worked. Here’s the photo of my hookup: Then I’ve noticed a possible cause for future problems : lines 4 and 7 of my MJ10-22-CS10 are actually used in this communication. It turned out that the RS232 communication with JZ20-R16 require 6 wire communication instead of 3 wire communication I’ve expected from RS232 interface. Due to the requirement of RTS and DTR signals! I’ve turned on my scope and actually saw those signals on pins 4 and 7 of MJ10-22-CS10 connector going high after the “handshaking” with my slave simulator was done. With PC USB disconnected: PC USB Connected: MudbusSlave after “handshaking”: Successful communication: CH3/4 are the DTR and DTS signals correspondingly. At this point I’ve realizes that sue to those signals I would not be able to connect my Unitronics to my Arduino, as the TTL-RS232 connector simply do not support DTR and DTS signals. So after hooking up my Arduino to Unitronics I see the following on the scope: Both DTR and DTS signals are on 0 instead of HIGH, which prevents the JZ20-R16 from accessing the modbus. The questions: Is there any chance to make JZ20-R16 communicate over RS232 without use of DTR/DTS signals? Is there an option to tweak those signals (connecting them to +5V permanently) Use of other TTL-RS232 converter? Any other way to make Arduino and JZ20-R16 communicate over RS232 interface using MODBUS Thank you for the patience. samplemodbusmaster232.U90

Hi, I'm running an Arduino-based home automation system. My custom-made Arduino clones are communicating over a RS485 network (configured as 8N1) using Modbus RTU protocol. Thing is that I want to have a reliable, industrial-grade PLC in the network, in order to monitor my Arduino-based sub modules. Basically I need a cost efficient Unitronics PLC capable of connecting to RS485 network, The ladder program is expected to be non memory hungry, also I'm fine with good old 2 line display. The PLC must be able to connect to the RS485 network without the use of any extension modules/communication modules /.etc (native COM port on a screw terminal). Any suggestions? Thank You.

Hi I have Unitronics V570 controlling my home's central heating system and I would like to make a webpage, that I can visit on my computer to see values from controller. But the thing is that I want to have a line graph to show temperatures from the past measurements. I have no clue on how to do so, because as far as I understand, you can't get values from data table(which probably will be stored on SD card) to your webpage, you can only get things like MIs and MBs and such. Only way I have figured out to get said graphs is to download data table from controller to computer and then do some magic, but that is not the solution I am looking for. Other question I have is how to connect Arduino board to PLC in a way, that I can get values from PLC's MIs to Arduino.I want to have remote temperature controller in other room with small screen. Can I somehow send serial values from PLC to Arduino or do I need CanBUS module for my Arduino? Thanks in advance.