W4K ModBus .json profile using function 16 (multiple write)

[sesa259844_brid]

Hello everybody,

I'd need to RESET COUNTERS in Schneider electricity meter iEM3155 via ModBus in W4K.

In W4K in pre-installed MB profile related to iEM3155 is only possibility to read values. Reset should be done by ModBus 16 write function.

I know I can download prepared .json profile and customize it... problem is I'm not able to add there a MB16 write function and make it works. To be concrete:

ModBus 16 function - multiple write:

reg. 5250 (uint16) - write value 2023

reg. 5251 (uint16) - write value 0

Have you ever faced the same issue? If you have an example (.json profile) - would be appreciated! 🙂

Thank you and have a nice day,

Jan

[Erwin-vd-Zwart · Accepted solution]

Hi,

Have you tried this? (not sure if it will work but seems logic that it will)

{

"name": "Reset",

"bus_datatype": "uint32",

"type": "register",

"address": 5249,

"datatype": "uint16",

"write_only": true,

"write_multiple": true,

},

Then write value 2023 to the KNX 4 byte unsigned integer object, this will result in writing 2023 to the first register (5250) and 0 to the second register (5251)

Make sure to disable the com protection in the meter otherwise it will not accept a value on the command interface.

If it does not work i have a script version to do it,..

require('luamodbus')
mb = luamodbus.tcp()
mb:open('192.168.1.2', 502)
mb:connect()
mb:setslave(1) -- Enter the correct Modbus slave address of the kWh meter

--see iEM 3255 user manual from page 62 for possible parameters

-- Reset partial energy counters
datanumber = 2020
reservedalways = ''

mb:writeregisters(5249, datanumber, reservedalways) --max 123 parameters entered by , , , ,
--Register 5250 = Requested command, 5251 = Not used, 5252 = parameter 1

-- Results of Reset partial energy counters
r1, r2 = mb:readregisters(5374, 2)
log ("Result Command: " .. r1)
log ("Result Code: " .. r2) -- 0 = valid operation, 3000 = invalid Operation, 3001 = Invalid Parameter, 3002 = Invalid number of parameters, 3007 = Operation not perfomed

-- ********************************************************

mb:close()

BR,

Erwin