Search results

How do you have the devices wired? Are you using a signal reference wire connected to the COM terminal of each thermostat? What is the position of JP3 on all of the thermostats? Do you have EOL termination turned on or installed anywhere on the network, if so where? What MAC address is your...

Would you be able to post a few example transmissions from the communication software and responses from the controller showing the incorrect CRC? Also out of curiosity, what sniffer software are you using?

Does the controller's configuration menu have baud rate, parity, or number of stop bits settings available, or at least a way to view what baud rate, parity, and number of stop bits it's actually using? Have you tried different parity and stop bit combinations, such as even 1 stop bit, odd 1...

What slave address do you enter in the software to achieve successful communications? Does entering a different slave address result in a connection error, or similar, in the software? According to the documentation you attached, the controller has a Password (register 2000H), but this appears...

Timeout errors are typically caused by either incorrect wiring or mismatched communication settings. Since you stated the communication software works successfully over RS-485, wiring is likely not the issue (assuming you are using the same USB to RS-485 adapter, wiring connections, etc.). Do...

Please try using Modbus Poll on your PC: https://www.modbustools.com/modbus_poll.html Setup the Read/Write Definition as follows to read the speed value, battery voltage, and charging voltage from the generator controller (note the below assumes the Modbus slave address of the generator is 10H...

Modbus RTU communication issues almost always come down to either wiring or configuration settings. Your wiring diagram appears correct, so I believe the issue is configuration settings. Of course, the first thing to confirm is that both devices are configured for the same baud rate and...

Since I believe the Proface HMI's support Modbus, I'm just going to go ahead and assume you're using Modbus. Modbus is Modbus regardless of whether it's Ethernet or serial (yes they use different encapsulations, but the core Modbus packet remains the same). The need to add or subtract 1from a...

Is this a Modbus register question? Please provide more details on how these HMI's are being used as well as the vendor and model(s) of the HMI's.

Or, since you now have a RS-485 to USB converter, forget the DB9 port entirely and just use the RS-485 to USB converter and DB-15 breakout box to make the connections (+ to +, - to -, and GND to GND).

I'm sorry, but what does the statement, "The DB9 is a standard linux COM port." mean? Linux is an operating system. It is software. The PC may have a DB9 connector. If that's the case, is the DB9 connector built into the motherboard of the PC (likely meaning it's an RS-232 port on an old PC, as...

What device has the DB9 connector? Your PC? A USB to RS-485 converter? DB9 is more commonly used for RS-232. You cannot directly connect RS-485 and RS-232 together.

Did you run the "win8settick" batch file, located in the TwinCAT\3.1\System directory as an administrator (by right-clicking on the file and selecting Run as Administrator) and reboot your computer? Many touchscreens include setup/configuration software that allows you to enable touch and hold...

Did you run the "win8settick" batch file, located in the TwinCAT\3.1\System directory as an administrator (by right-clicking on the file and selecting Run as Administrator) and reboot your computer?

I'm sorry, but the only information I have is what is in the manual. I don't have one of these units that I can test with and provide a step by step tutorial. There is no such thing as "no data" when communications is successful. Perhaps the data is not what you expect, such as a value of 0 or...

The specific steps are described in section 7.1 Reading Max / Min Demand of the manual you attached. You will need to convert the Start Reg (Hex) from hexadecimal to decimal and add 1 before entering the register address in ModScan. For example, this would be the configuration for the Max /...

Are the devices connected via RS-485 or Ethernet? If RS-485, then it's Modbus RTU (or possibly the less common Modbus ASCII). If Ethernet, then it's Modbus/TCP.

So you've confirmed that the values on the gateway are updating, but the values in the clients Modbus Master are not. Since Modbus is a request/response protocol, it may be simply that the Modbus Master is not making requests to read the Input Registers from the gateway. This could be due to...

Hello and welcome to the forum! If you're new to Modbus, I recommend reading and understanding the following Modbus resources first: https://control.com/technical-articles/introduction-to-modbus/...

Please attach the energy meter's GSD file that is being used. How is the SCADA system's I/O data configured for this device? Please check which modules from the GSD file that the SCADA system is using for the I/O data with the energy meter. Given the error, I suspect the SCADA is using a module...