ASAIR AFM0725, Instruction Manual, Page: 6 / 12

As a slave, the default address is 0x01, which supports address modification and can be connected to the bus of multiple slaves.
The communication protocol is standard Modbus RTU. The host can be a computer, RS485 receiver and MCU controller, etc. AFM0725
The Modbus RTU communication register definition of AFM0725 is shown in Table 5.
The digital output communication mode of AFM0725 gas mass flowmeter is RS485 communication, and the communication parameters are shown in Table 4.
4. Product Communication Protocol and
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Output
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stop bit
data bits
parity
none
communication rate
8
July 2022
bits
1 person
start bit
4800/9600/19200/115200bps
Communication parameters
Protocol format
1 person
describe
Table 4. RS485 Communication Parameters
RTU
4.1 RS485 communication