Microsensor MFE600C, Руководство по эксплуатации

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03 Function code 03 Function code
00 Register address high 04 Byte numbers
00 Register address low (display address) 80 Data 1
00 Register numbers high 04 Data 2
02 Register numbers low 80 Data 3
CRCH CRC Check code is high 80 Data 4
CRCL CRC Check code is low CRCH CRC Check code is high
CRCL CRC Check code is low
For a multi-byte number transmission, use the BIG-ENDIAN format, that is, use the format with
high-weight bytes first and low-weight bytes after transmission. For example, a four-byte number
ABCDEF12H, the transfer order is: D0= ABH, D1=CDH, D2=EFH, D3=12H
。
For a two-byte number such as 12ABH, then D0=12H, D1=ABH
。
For floating-point numbers, the format is IEEE 754 single-precision, and the transmission order is the
high byte first and then the low byte. The high byte is the byte where the sign bit and exponent bit in the
floating-point number are located, and the low byte is the byte where the mantissa is located.
Above D0, D1, D2, and D3 respectively correspond to D0, D1, D2, and D3 in the transmission data
sequence described later.
According to the MODBUS RTU protocol specification, the maximum number of data bytes allowed to be
transmitted in one communication is 250 (125 × 2).
Parameter storage
TPTR
Explanation Data type Data length
00 Instantaneous flow information FLOAT 4
02 Instantaneous flow unit information SHORT 2
03 Positive total integer low LONG 4
05 Positive total decimal place FLOAT 4
07 Positive total unit SHORT 2
08 Reverse total integer low LONG 4
0A Reverse total decimal places SHORT 4
0C Reverse total unit LONG 2
0D Excitation alarm FLOAT 2
0E Electrode alarm SHORT 2
0F Empty pipe alarm SHORT 2
10 Upper limit alarm SHORT 2
11 Lower limit alarm SHORT 2