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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...

If the chiller is comprised of 3 Modbus RTU slave controllers and a Modbus RTU master PLC, I would treat this system as a "black box". If you remove the PLC from this network, the chiller could very well cease to function. Instead, you should investigate whether the PLC has another RS-485 or...

If you use a Modbus/TCP to Modbus RTU router, gateways are not needed. The router takes the place of all Modbus RTU to Ethernet gateways. For example, say you have 10 Modbus RTU devices on a RS-485 network that are at addresses 1 - 10. You install a Modbus/TCP to Modbus RTU router onto the...

JoeJ, Do you already have Modbus RTU to Ethernet gateways installed, or do you have Modbus RTU devices and need a way to access them from the internet? If it is the latter, then I would suggest using a single Modbus/TCP to Modbus RTU router. The router will allow you to access all Modbus...

You should use an RS-485 repeater when connecting more than 32 devices to a Modbus RTU network, although this may not actually be necessary depending on the devices on your network. The limit of 32 devices is not really a device limit, but a load limit on the RS-485 bus. This limit is defined...

The short answer: In order for most Modbus masters to be able to communicate with your slave implementation, you must make each floating point value (32-bits) span two registers (16-bits each). The long answer: Your description of "holes" in your address map is not actually how it...

When you experience this issue, you're saying that one of the thermostats stops responding entirely and must be rebooted. While this sounds like a logical issue with the thermostat itself, it's possible it's getting into this state due to electrical problems with your network. I would...

It sounds like you're attempting to solve your issue by trying to use an easy workaround instead of investigating the root cause of why your Modbus TCP server is getting restarted. In general, it is good for a Modbus TCP server to support multiple, simultaneous connections regardless of...

Because you're getting a response from the meter with the baud rate and parity matching, this suggests that the meter is receiving a valid request and replying. However, the response is somehow being mangled. I would be suspicious of your SparkFun converter. On the product page for that...

If your BACnet/IP client is monitor only, meaning it does not need to write data to any of the Modbus RTU slaves, you can connect our ETH-1000 gateway onto the Modbus RTU daisy chain network and use its Modbus RTU Sniffer driver to "sniff" the data that your Modbus RTU master is reading and...

If your barcode reader has an Ethernet or serial interface you could use our ETH-1000 gateway to read the barcode value from the barcode reader and write the product number to the metal detector. For communicating with the barcode reader, the ETH-1000 supports both a generic socket (TCP/UDP)...

It is possible to simulate 100s of IP addresses on a single network adapter on a Windows PC using the netsh command. The syntax is as follows: netsh interface ip add address "ETHERNET_ADAPTER" IP_ADDRESS SUBNET_MASK Example: netsh interface ip add address "Local Area Connection"...

Hi, Our XLTR-1000 gateway can perform this conversion. You would configure one RS-485 port as a Modbus Master to read the 32-bit floating point registers into the gateway's internal database, then configure the other RS-485 port as a Modbus Slave to expose the data as 32-bit integer...

ICC provides a free Modbus master tool that is built on the .NET framework. It can operate as both a Modbus TCP or Modbus RTU master that can continuously monitor and log register sets to a .CSV file for post-processing by a program such as Microsoft Excel. The .CSV file is shared, which means...

Hi, Our XLTR-1000 gateway can convert between M-Bus and Modbus RTU. http://www.iccdesigns.com/products/millennium/xltr-1000.html However, because that gateway is RS-485 to RS-485, you must use a level converter to connect to M-Bus devices, such as this one...