User’s Manual
Rev1.0
Date:15/07/2015 User’s Manual
27
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47
If a password has been set to a TGF450 thermal mass flowmeter, users can enter code setting C47=01
to set a new password.
6 Instruction of RS485 Modbus Communication
6.1 Interface regulation
The communication interface should be RS485, the range of Baud rate should be 1200~115200.
The wiring terminal is “A” and “B”.
The communication should comply with MODBUS-RTU statute.
The combination of a communication signal: Address code - function code – date segment – CRC
calibration code. The distance between two characters should not be longer than one character, or it
will be considered as the beginning of a new message or the end of a old message. The message is
combined with hexadecimal arrays.
Defination of the dates: Please reference to the chart 6.1 below.
Chart 6.1 Address of the displayed date
Register
address
Usage
Nature
Date type
0~1
Flow rate
Read only
Float
2~3
Frequency
Read only
Float
4~5
Pressure
Read only
Float
6~7
Total Flow
Read only
Float
The displayable dates including flow rate, pressure, temperature and total flow, if the meter is not
multi-variable version, then the reading of pressure and temperature will both be 0. The date of the
parameters in above chart can be read by using function code 03 according to the address above and
shifting.
The addresses of code setting are as below.
