Example of appending the calculation result, Figure 4.2, Normal response frame – Rockwell Automation 900 Temperature Controller Communications Functions - Series B User Manual

Page 61: Figure 4.3, Error response frame, Figure 4.4, Response frame -3, Response frame

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Publication 900-UM004D-EN-E - July 2010

Modbus Communications Procedure

4-3

Example of Appending the Calculation Result

When the calculated CRC value is H’1234, the CRC value is appended to the
command frame as shown in Figure 4.2.

Figure 4.2

Response Frame

Normal Response Frame

Figure 4.3

Error Response Frame

Figure 4.4

CRC-16

1

1

Low

H'34

High
H'12

Data

CRC-16 calculation range

2 bytes

Slave

address

Function

code

CRC-16

1

1

Data

CRC-16 calculation range

2 bytes

Slave

address

Function

code

CRC-16

1

1

1

CRC-16 calculation range

2 bytes

Slave

address

Function

code

Error

code

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