Wecon VD2 SA Series, Руководство пользователя, Страница: 109 / 171

Wecon VD2 SA Series Servo Drives User Manual (Full V1.0)
102 WECON technology Co., Ltd
8.2.4 Error response frame
Address Function code Error code CRC check code
1 byte Command code+0x80 Error code 2 bytes
When an error occurs, set the function code bit7 issued by the host to 1, and return (for
example, 0x03 returns 0x83, 0x06 returns 0x86); the description of the error code are as follows:
Error code Coding description
0x0001 Illegal command code
0x0002 Illegal data address
0x0003 Illegal data
0x0004 Slave device failure
8.2.5 Communication example
[03 Function Code Read]
Read the monitoring volume [U0-31] bus voltage, the modbus register address corresponding to
this variable is 7716 (0x1E24)
Request format:
Address
Function
code
Register address
high byte
Register address
low byte
Data high
byte
Data low
byte
CRC check
code
1 byte 06 1 byte 1 byte 1 byte 1 byte 2 bytes
The slave responds normally:
Address
Function
code
Number of
bytes
Data high
byte
Data low
byte
CRC low
byte
CRC high
byte
01 03 02 0C 26 3C 9E
The value read is 0x0C26, which means that the voltage is 311.0V.
[06 Function Code Write]
[P1-10] The maximum speed threshold is set to 3000rpm. This variable corresponds to the modbus
address: 266 (0x010A)
Request format:
Address
Function
code
Register address
high byte
Register address
low byte
Data high
byte
Data low
byte
CRC low
byte
01 06 01 0A 0B B8 AF
The slave responds normally:
Address
Function
code
Register address
high byte
Register address
low byte
Data high
byte
Data low
byte
CRC low
byte
01 06 01 0A 0B B8 AF