ENCARDIO RITE ESM-12S, Руководство пользователя

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Users’ Manual ESM-12S Digital seepage monitoring system
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7.5 Modbus command format
Followings are some examples of Holding Registers Read and single register write.
•
Reading Holding Registers (Ex: Reading sensor data)
BYTE REQUEST BYTE ANSWER
(Hex) Field name (Hex) Field name
02 Device address 02 Device address
03 Functional code 03 Functional code
01
Address of the first register Hi
bytes
0C Number of bytes more
2C
Address of the first register Lo
bytes
00 00
Register value Ch-1 Status 16-bit un-
signed
00 Number of registers Hi bytes
3B 21 3E
1B Register value Parameter 32-bit Float
(0.002460)
06 Number of registers Lo bytes 00 00
Register value Ch-2 Status 16-bit un-
signed
05 Checksum CRC
41 DB E3
36
Register value Temperature 32-bit
Float
(27.485)
CE Checksum CRC B1 Checksum CRC
82 Checksum CRC
•
Write Single Register (Ex: Changing device address from 0x0001 to 0x0002)
BYTE REQUEST BYTE ANSWER
(Hex) Field name (Hex) Field name
01 Device address 01 Device address
06 Functional code 06 Functional code
00 Address of the Register Hi bytes 00 Address of the Register Hi bytes
DD Address of the Register Lo bytes DD Address of the Register Lo bytes
00 Data (write) Hi bytes 00 Data (value) Hi bytes
02 Data (write) Lo bytes 02 Data (value) Lo bytes
98 Checksum CRC 98 Checksum CRC
31 Checksum CRC 31 Checksum CRC