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RS485 COMMUNICATION OUTPUT TYPE
1. Interface description
Wide voltage power supply input 10-30V DC power supply. When connecting 485 signal line, it is noted that the two
lines a and B cannot be connected reversely, and the address between multiple devices on the bus cannot conflict.
Line color
Explain
Power
brown
Positive power supply (10 ~ 30V DC)
black
Power supply negative (GND)
Output
yellow
485-A
blue
485-B
2. Installation and use of configuration software
2.1. Software selection
Open 485 data package, select "debugging software" - "485 parameter configuration software", find
(Parameter
configuration tool.exe)
and open it.
2.2. Equipment connection
2.3. Parameter setting
(1) Select the correct COM port (check the COM port in my computer - properties - Device Manager - port). The
following figure lists the driver names of several different 485 converters.
3. Computing method
3.1 conversion calculation of current mode output signal
The measuring range is 0 ~ 40m / s, 4 ~ 20mA output. When the output signal is 12mA, the current wind speed is
calculated. The span of wind speed range is 40m / s, which is expressed by 16mA current signal. 40m / S / 16mA =
2.5m/s/ma, that is, the current changes 1mA, and the wind speed changes 2.5m/s. Then the measured value can be
calculated. The measured value 12ma-4ma = 8Ma. 8Ma * 2.5m/s/ma = 20m / S, and the current wind speed = 20m / s.
3.2 calculation of voltage mode output signal conversion
The measuring range is 0 ~ 40m / s. take 0-10V output as an example, when the output signal is 5V, the current wind
speed is calculated. The span of wind speed range is 40m / s, which is expressed by 10V voltage signal. 40m / S / 10V
= 4m / S / V, that is, every 1V change of voltage corresponds to 4m / s change of wind speed. The measured value is
5v-0v = 5V. 5V*4/m/s/V=20m/s
。
The current wind speed is 20m / s.