SEC 3120 16-bit Modbus Manual
Page 32 Of 46
Sensor Electronics Corporation
For Version 1.2 and above
December 2012
P/N 1580282, Rev. 1, 20121228
Here is an example of a request to read Modbus holding registers 42104–42106
from slave device 17, sensor 1 (region 1 = 21xx):
Response
The register data in the response message are packed as two bytes per register,
with the binary contents right justified within each byte. For each register, the first byte
contains the high order bits, and the second byte contains the low order bits.
Here is an example of a response to the query:
The contents of register 42104 are shown as the two byte values of 01 2A hex or
298 decimal. The contents of registers 42105 and 42106 are 01 8F and 03 21 hex, or 399
and 801 decimal, respectively.
Read Holding Register Response
Field Name
Example (Hex)
Slave Address
11
Function Code
03
Byte Count
06
Data High Byte (Register 42104)
01
Data Low Byte (Register 42104)
2A
Data High Byte (Register 42105)
01
Data Low Byte (Register 42105)
8F
Data High Byte (Register 42106)
03
Data High Byte (Register 42106)
21
CRC Low Byte
04
CRC High Byte
5D
Read Holding Register Query
Field Name
Example (Hex)
Slave Address
11
Function Code
03
Starting Address High
08
Starting Address Low
37
Num Points High
00
Num Points Low
03
CRC Low Byte
B4
CRC High Byte
F5
Содержание SEC 3000
Страница 15: ...Doc 1460003 Rev A Operation Manual SEC 3000 Electro Chemical Gas Sensor Page 12 of 13 ...
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