Page 71 of 74 Shezhen Beilai Technology Co., Ltd V1.1
Cellular IoT M2M RTU --- S272/S274/S275
Short circuit: Logic 1
Open circuit: Logic 0
Wet contact
0-0.5V: Logic 1
3-30V: Logic 0
3) Read, Input Register (Function Code 04: Read Input Register)
Enable when DIN0 as
counter mode
Enable when DIN1 as
counter mode
Enable when DIN2 as
counter mode
Enable when DIN3 as
counter mode
In the description, each variable is defined as follows:
Y: True value
X: The value stored in the register
"Y=X/100" means: "real value = the value stored in the current register/100"
4) Read and Write, Holding Register (Function Code 03, Function Code 06, Function Code 16)