I should say that i am first and foremost an electrician who is moving direction towards the Building Management Systems of controls. So I am hoping that I am in the right place to learn and pick up some golden nuggets of information and understanding of the Modbus network structure.
I've been installing BMS systems in commercial projects, these recently changed from all field devices including AHU's HRU's being hard wired connected to the BMS panel for monitoring/controlling, to the new system which now splits the control of the AHU and the AC both separate to the BMS panel. All communication is now via a modbus network, which is completely new to me. On advice, I have downloaded a modbus scanner and whilst I can get it to operate I have not a clue at what I should be looking for?
The numbers seem to bear no resemblance to what I have read and watched on the web. So how much have I too learn???
So where am I? Well I understand (at least I think) the significance of the Baud rate, word, parity, stop bits, but have no idea of what they mean in real terms. I understand the slave Id, I have followed the modbus formula - but when I run the scanner the figures I see before me don't look anything like what I've seen.
The numbers are in pairs when I'd expect them to be in fours??
Any direction would be helpful, I'll answer any questions as best as I can, please be patient.
I've been installing BMS systems in commercial projects, these recently changed from all field devices including AHU's HRU's being hard wired connected to the BMS panel for monitoring/controlling, to the new system which now splits the control of the AHU and the AC both separate to the BMS panel. All communication is now via a modbus network, which is completely new to me. On advice, I have downloaded a modbus scanner and whilst I can get it to operate I have not a clue at what I should be looking for?
The numbers seem to bear no resemblance to what I have read and watched on the web. So how much have I too learn???
So where am I? Well I understand (at least I think) the significance of the Baud rate, word, parity, stop bits, but have no idea of what they mean in real terms. I understand the slave Id, I have followed the modbus formula - but when I run the scanner the figures I see before me don't look anything like what I've seen.
The numbers are in pairs when I'd expect them to be in fours??
Any direction would be helpful, I'll answer any questions as best as I can, please be patient.