Calculated itens - modbusget itens

[dade]

Hello,

I was trying to do some caculated itens with my modbus.get itens, but i got this error(attachment):

• Invalid parameter "/1/params": incorrect expression starting from "last(modbus.get["rtu://dev/ttyUSB0:9600:8n1,2,1,0,8,bit,be,0]")/last(modbus.get["rtu://dev/ttyUSB0:9600:8n1,2,2,0,8,bit,be,0]")".

My formula is: last(modbus.get["rtu://dev/ttyUSB0:9600:8n1,2,1,0,8,bit,be,0]")/last(modbus.get["rtu://dev/ttyUSB0:9600:8n1,2,2,0,8,bit,be,0]")

I read the documetation but i didnt realized where i can be wrong. Do these calculated items work with the modbus.get items?

ps. I've already tried different combinations with the quotes


Thanks in advance!!!