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+--- Thread: Use of address_scale with read_count and read_offset Modbus Profiles (/showthread.php?tid=6174)
Use of address_scale with read_count and read_offset Modbus Profiles - merlin - 01.11.2025
Hi i Hope this is relative simple question
When using read_count and read_offset features in a modbus profile, can i use address_scale in the same process and if so what value do you use for address_scale, the offset from the block read point or the actual address.
I have in fact tried both and Neither work I know when using the read_count and read_offset on there own return the correct value, but when using with address_scale I just get 0 back. Examples of what i have tried below from my profile, i have tested each of these with no address_scale using the block read and i get results so i know the registeres and offsets are all working fine. and note the SF location are all in the block that is read
/* I_AC_Current (A) @40071, SF @ Address Location 40075 */
{ "name": "I_AC_Current", "type": "register",
"address": 40069, "read_count": 50, "read_offset": 2,
"datatype": "uint16", "bus_datatype": "float32",
"address_scale": 40075, "units": "A",
"value_nan": [65535], "value_default": 0
},
/* I_AC_CurrentA (A) @40072, SF @ Offset Location */
{ "name": "I_AC_CurrentA", "type": "register",
"address": 40069, "read_count": 50, "read_offset": 3,
"datatype": "uint16", "bus_datatype": "float32",
"address_scale": 6, "units": "A",
"value_nan": [65535], "value_default": 0
},
/* I_AC_VoltageAN (V) @40079, SF Note Defined (this works)*/
{ "name": "I_AC_VoltageAN", "type": "register",
"address": 40069, "read_count": 50, "read_offset": 10,
"datatype": "uint16", "bus_datatype": "float32",
"units": "V",
"value_nan": [65535], "value_default": 0
},
Any help here would be appreciated.
If you have to ask why using block read, it is because i need to get all values back with the same time stamp for calculations, reading each item individually introduces errors .