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Well, first off, no it is not useful to read another product's Modbus manual if you will be using a different product. You need only be concerned with the manual of the product you're actually using. But since some of your questions are applicable to other Modbus devices, I'll try to give an...

Unfortunately, I am by no means an expert with these I/O modules. If you have specific questions regarding their operation, I recommend you contact the vendors directly. The Advantech commands are not compatible with any other vendors' product. The ADAM 4068 module supports two protocols, a...

Omni uses what is known as Enron/Daniel Modbus. Take a look here for details: https://store.chipkin.com/articles/modbus-daniels-what-is-enron-or-daniels-modbus I'm not sure if the S7 supports Enron/Daniel. You will need to contact Siemens or perhaps someone here more knowledgeable on the S7 can...

What connection? Please describe all equipment you're using (including vendor and model) and all connections being made (including where all wires are landed) .

Is the point of your testing to test the "modems" that you've connected to your PC, or something else (cable/wiring perhaps)? What is the vendor and model of the "modems"?

The converter seems like it should work, but you should test it with known working RS-485 device. For RS-485, be sure to set the DIP switches properly for RS-485 and connect your wires to the B-, A+, and GND terminals (I believe the TXD and RXD terminals are for RS-232 mode only). According to...

I apologize, but I'm confused about how your system is set up and the equipment involved. It seems that Foxguard Solutions makes security platforms for control systems that simply monitor and secure the control network. I can't find any product on their website that would seem to be capable of...

Standard Modbus registers are 16-bit integers, which can only express whole numbers. It's very common for vendors to scale the value by 10 or 100 so that one or two decimal places can be included in the number. The 2458 value is likely the raw Modbus value. Somewhere, (perhaps in the gateway or...

I suggest you compare the datasheets of the two devices: ADAM 4068 https://advdownload.advantech.com/productfile/PIS/ADAM-4068/file/ADAM-4060_4068_4069_DS(050421)20210703000415.pdf WP8025ADAM https://www.eletrodex.com.br/upload/download/index/upload/2058/

Good to know the heat pump has 2 RS-485 ports and that the other RS-485 port is strictly a slave. I'm guessing this is exactly what David was attempting to figure out way back in post #15

Seems simple enough. All information can be found in the User Manual: https://advdownload.advantech.com/productfile/Downloadfile5/1-23RKJ8K/ADAM-4000_Series_User_manual_Ed.8_D6.pdf Refer to Appendix G for the Modbus register tables for each model. The "ADDR 0X" column is the (1-based) Coil...

The module you show is the ICP DAS I-7063D. This module is a Modbus RTU I/O module that supports 8 channels of digital inputs and 3 form A relay outputs. If you are looking for a Modbus RTU I/O module with only relay or digital outputs (and don't need digital inputs), then there may be a more...

You may want to capture packets again with IO Ninja while the display is connected to the heat pump and you change settings on the display. From the captures last time, the heat pump only reads registers 3001 - 3090 from the display. There was never a request from the heat pump to read...

I was able to simulate this successfully and can use the Modbus Slave software to both see broadcasts (register addresses 2001 - 2090) and send data (register addresses 3001 - 3090). Here is how I have Modbus Slave configured Perform this test with both the display and WiFi module...

I'm not sure about the availability of software that can perform mapping, remapping, and logic on Modbus registers, but my company does have a hardware solution that can perform this task. Our Mirius serial gateway supports Modbus RTU and can map, remap, and perform logic on register values. The...

While I can't speak to the validity of the vendor's claims regarding the ultrasonic wind sensing technology (I'm a Modbus guy, not a sensor guy), I do agree with you that it seems like an extreme reaction to a single sensor reading out of range (assuming there are multiple sensors employed to...

Yep, that's exactly where I was going with this. A lot of Modbus equipment set register values to a special value if the value is "unreliable". From the manual: The measurement values are mapped to the 16bit registers using scaling factors (0 ... max. 65530 for unsigned values, -32762 ... 32762...

What is the vendor and model of the weather station you're using? Can you share documentation that includes the Modbus register list? Could the spikes simply be the wind blowing in the opposite direction, causing a negative wind speed value, and your acquisition software is interpreting the...

It seems that your Modbus communications is not the issue here. If you are successfully reading values (regardless of what the values are) Modbus communication is working correctly. Modbus has built-in error checking for corrupted packets, so it is impossible for noise, voltage/current spikes...

I'm not so sure there is a universally accepted standard for RS-485 pinout for DB9 connectors. Best to follow the VIPA PLC's manual. For example, this one specifically calls out pins 3 and 8...