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+--- Thread: ModBus - SE CVM (/showthread.php?tid=2300)
ModBus - SE CVM - FatMax - 23.10.2019
Hi,
I wish I had bit more experience with ModBus, but sadly I don't, hence the question here.
See attached screenshot. I'm making a profile for this equipment and I only need 4 registers. L1 current, L2 current, L3 current and active power for all phases. I'm after the data in the Instant column. Now, it seems the data is supplied through 2 adresses...? 02-03 points to L1 current (HEX I presume), so how do I combine these two to give me the right result?
RE: ModBus - SE CVM - admin - 23.10.2019
Use RTU read test. Set address to 0, data type to uint32 and try different read swap values until you get a valid reading.
RE: ModBus - SE CVM - FatMax - 23.10.2019
(23.10.2019, 10:12)admin Wrote: Use RTU read test. Set address to 0, data type to uint32 and try different read swap values until you get a valid reading.
That worked and I should have been able to figure that out myself.
Just one question; when polling register 02 (Decimal: 2) I got a correct and expected result. However, when polling register 03 (Decimal: 3) I got "Illegal *something". Why have they put two different registers in that table? Thanks for your help.
For future reference, if anyone has a Scandinavian Electric CVM Mini MC they need to get the amp results from, the decimals are:
L1 current, 2
L2 current, 12
L3 current, 22
Active power, 24
I have added a multiplier; 0,001 to the json profile.
RE: ModBus - SE CVM - Daniel - 23.10.2019
While using uint32 you are reading 2 registers 02 and 03. Single register in modbus is 16bit.
RE: ModBus - SE CVM - FatMax - 23.10.2019
(23.10.2019, 11:03)Daniel. Wrote: While using uint32 you are reading 2 registers 02 and 03. Single register in modbus is 16bit.
Ah, everything makes sense now. Thank you!