Recent content by jschulze

As for the cable shield, standard practice is to earth it at one end only and daisy-chain it at each device so that it is continuous.

This sounds like a "lack of a common RS-485 0V reference" issue. When the laptop is on battery power, its 0V reference is floating and will naturally sit appropriately halfway between the + and - signals. When the power adapter is plugged in, your laptop's 0V reference is now (likely) tied to...

The only Modbus manual I could find is the 4 page datasheet for the Modbus Power Control license, which I linked to in my last post. That document lists the communication parameters, register format, and register list.

Is your device licensed for Modbus? According to the blue'Log XM / XC page on the Meteocontrol website, the "Power Control Modbus" functionality is a separate license...

Another solution would be to use a gateway between your PLC and the new inverter. The gateway would be configured to emulate the old inverter and present the same registers/coils to the PLC. The gateway would translate the registers/coils to the appropriate registers/coils for the new inverter...

I assume by front panel display, you're referring to the S7999D SOLA Operator Interface Display. If so, I believe you can keep this connected, as the display is designed to have a BAS connected to one its RS-485 ports and 1 or more SOLA controllers to the other RS-485 port. You should be able to...

The default password is "sola", however this can be changed on the SOLA controller, so confirm that you are sending the correct password as configured on your controller. Also, this password must be sent at least every 10 minutes, as the SOLA automatically logs you out every 10 minutes. You can...

We've successfully interfaced our gateway products to several boilers that use the Honeywell SOLA controller. I believe you may need to write the entire password field (10 registers total) starting at Holding Register 178 (40178 - 40187). You may also want to try writing to the other password...

If you are looking for a tool that will read the values of the Modbus registers on your controller and verify them against predetermined values, this can be done with our free ICC Modbus Master Tool software available here: http://www.iccdesigns.com/software/43-icc-modbus-master-tool.html To...

You could use the ICC ETH-1000 gateway and configure its RS-485 port for Modbus RTU Sniffer and its Ethernet port for Modbus/TCP Server. This will have the least impact on your existing Modbus RTU bus. The Modbus RTU Sniffer driver passively listens to the existing requests and responses on...

Either of the libraries that the OP mentioned will work for the entire 65K address space. The NModbus library takes a ushort argument for the start address when reading/writing registers. Therefore, it supports values from 0 - 65,535, which is the entire range. The EasyModbus library takes...

I think there may be some confusion here on Modbus addressing terminology. There is actually no difference between register 40,001 and register 400,001 - both are referring to Holding Register 1. To understand why this is the case, you first need to understand how the register is addressed in...

There are a few free software libraries for Modbus available on the internet. If you are comfortable working with C#, NModbus is an easy library to use: https://github.com/NModbus/NModbus Otherwise for C or C++, there is a C library called libmodbus: https://libmodbus.org/

We have a free tool available for Windows that can read holding registers from Modbus/TCP or Modbus RTU devices and log values to a CSV file. You define the registers you would like to access by defining an XML profile file. The software is called the ICC Modbus Master Tool and is available...

You will probably need a Modbus gateway of some sort, but your question is far too general for anyone to help you further. The term "Ethernet TCP/IP" provides little more information about your Public Address System than simply saying it has an Ethernet port. We need to know what Ethernet...