2 modbus fc 03 read holding registers – Flowserve Limitorque Master Station III User Manual
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Limitorque Master Station III FCD LMENIM5001-02 – 12/13
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Table 8.2 - Function Code -02 Example Message Breakdown
Query
Response
01
MSIII Unit Address
01
MSIII Unit Address
02
Function
02
Function
00
Starting Address Hi
02
Byte Count
50
Starting Address Lo
04
1
Data (Inputs 10088 - 10081; MOV2)
00
No. of Points Hi
08
2
Data (Inputs 10096 - 10089; MOV2)
10
No. of Points Lo
BABE
Error Check (CRC)
79D7
Error Check (CRC)
NOTE 1: 04h equals 0000 0100 (actuator stopped in mid-travel input bit is ON)
NOTE 2: 08h equals 0000 1000 (actuator Channel B fault input bit is ON)
8.2.5.3.2 Modbus FC 03 Read Holding Registers
Touching the “Modbus FC 03 Read Holding Registers” button will take the user to the Modbus Holding
Registers screen (Figure 8.24) for selection of desired field unit holding registers 3-15. Note that registers
8 and 9 are always included in the data table.
Figure 8.24 - Modbus Holding Registers
Selecting the “Next” button will advance the screen to the following sample data table screen: