patrickduis's latest activity

of course.

The modbus slave I talked about has a register where you should write the state of the relays in. It is a low power contact, so drive...

See our Promux modbus RTU RS-485 or TCP ethernet modules. Work extremely reliably, simple and very rugged. Hardware has automotive...

As long as the RTU has more than one serial port, it seems you can run Modbus Slave and Modbus Master simultaneously. Note that at least...

I would contact ABB, they are specialized in transformers and transformer monitoring systems.

You said you use a VFD. Most VFDs have a ModBUS RTU RS-485 connection. With that you can read out all the current, voltage and power...

There are several devices for that. They integrate the voltage and calculate the true RMS voltage (equivalent DC like voltage of the AC...

depends on what the interface IC of the device does when switched off. normal people would design it in such a way, that the outputs...

Unfortunately we cannot be more descriptive with our responses until you are more descriptive in explaining the problem. We need to know...

how is the modbus interface of the master and slave(s) configured? They must be the same. Sometimes, because of a bad interface, bits...

Thanks! The DRS pitches an error when you query non-existent registers in a bulk request, so your point is correct. That is going to...

I sometimes encountered a problem with slaves that don't support multi read function codes. Then I set the driver in Pro-face manually...

Contact Guido of Ex-Machinery, he is an expert in this matter https://ex-machinery.com/nl/contact/

Can you specify the Ex class you talk about?

Sometimes you need to swap the A and B lines on RS485. I think you already tried that. I use a lot of pro-face touchpanels, and the 1st...