Examples Of Messages For Commands/Responses - Omron Q2V Series Technical Manual

Description
Initial value (FFFF(Hex.))
Address 02 (Hex.)
XOR w initial value
Shift 1
XOR w A001 (Hex.)
XOR result
Shift 2
XOR w A001 (Hex.)
XOR result
Shift 3
Shift 4
XOR w A001 (Hex.)
XOR result
Shift 5
Shift 6
XOR w A001 (Hex.)
XOR result
Shift 7
Shift 8
XOR w A001 (Hex.)
XOR result
Perform operations with next data (function code)
Response Data
The drive does the CRC-16 calculation for the response message and makes sure that the data does not have
errors. Make sure that the calculated value is the same value as the CRC-16 in the response message.
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Examples of Messages for Commands/Responses

The items in this section are examples of messages for commands/responses.
■
Read the Description of Holding Register
Uses function code 03 (Hex.) to read the contents of a maximum of 16 holding registers.
These are example messages when the drive reads status signal from the drive of slave 2, the error contents, fault
contents, and frequency references.
Figure 6.9 Message Example When Reading the Contents of Holding Register
SIEPCYEUOQ2V01A Q2V Technical Manual
Calculation Overflow
1111 1111 1111 1111
0000 0010
1111 1111 1111 1101
0111 1111 1111 1110 1
1010 0000 0000 0001
1101 1111 1111 1111
0110 1111 1111 1111 1
1010 0000 0000 0001
1100 1111 1111 1110
0110 0111 1111 1111 0
0011 0011 1111 1111 1
1010 0000 0000 0001
1001 0011 1111 1110
0100 1001 1111 1111 0
0010 0100 1111 1111 1
1010 0000 0000 0001
1000 0100 1111 1110
0100 0010 0111 1111 0
0010 0001 0011 1111 1
1010 0000 0000 0001
1000 0001 0011 1110
Figure 6.8 CRC-16 Calculation Example
6.3 Modbus Communications
Description
Function code 03 (Hex.)
XOR w result
Shift 1
XOR w A001 (Hex.)
XOR result
Shift 2
XOR w A001 (Hex.)
XOR result
Shift 3
Shift 4
XOR w A001 (Hex.)
XOR result
Shift 5
Shift 6
XOR w A001 (Hex.)
XOR result
Shift 7
XOR w A001 (Hex.)
XOR result
Shift 8
XOR w A001 (Hex.)
XOR result
CRC-16
Continue from here with next data.
Calculation Overflow
0000 0011
1000 0001 0011 1101
0100 0000 1001 1110 1
1010 0000 0000 0001
1110 0000 1001 1111
0111 0000 0100 1111 1
1010 0000 0000 0001
1101 0000 0100 1110
0110 1000 0010 0111 0
0011 0100 0001 0011 1
1010 0000 0000 0001
1001 0100 0001 0010
0100 1010 0000 1001 0
0010 0101 0000 0100 1
1010 0000 0000 0001
1000 0101 0000 0101
0100 0010 1000 0010 1
1010 0000 0000 0001
1110 0010 1000 0011
0111 0001 0100 0001 1
1010 0000 0000 0001
1101 0001 0100 0000
1101 0001 0100 0000
D 1 4 0
(Lower) (Upper)
195
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