Inovance MD500T22GB-INT - Page 186

6. Description of Parameters
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Master Command Slave Response
ADDR 01H ADDR 01H
CMD 03H CMD 03H
Parameter address high bits F0H Parameter address high bits F0H
Parameter address low bits 0AH Parameter address low bits 0AH
Number of function parameters 01H Number of function parameters 01H
CRC high bits DEH CRC high bits DEH
CRC low bits D7H CRC low bits D7H
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Write Function Parameters
For function parameters in groups F0 to FF, the highest eight bits in communication
address indicate 00 to 0F or F0 to FF according to whether to write parameter to
EEPROM, while the lowest eight bits indicate the hexadecimal number converted from
SN in function code group.
For example, host computer writes data to F0-16. If not writing to EEPROM,
communication address is 0010H. If writing to EEPROM, communication address is
F010H.
For function parameters in groups A0 to AF, the highest eight bits in communication
address indicate 40 to 4F or A0 to AF according to whether to write parameter to
EEPROM, while the lowest eight bits indicate the hexadecimal number converted from
SN in function code group.
For example, host computer writes data to AC-08. If not writing to EEPROM,
communication address is 4C08H. If writing to EEPROM, communication address is
AC08H.
To write data, host computer needs to send a write command to the AC drive. Here takes
Modbus protocol as an example to describe communication process of writing data to
the AC drive.
For example, to write 2 to AC-16 (not writing to EEPROM), write command is
01064C1000021F5E (hexadecimal). In the command,
● 01H (settable): AC drive address
● 06H: write command
● 4C10H: communication address of AC-16
● 02H: writing data
● 1F5EH: CRC check
Master Command Slave Response
ADDR 01H ADDR 01H
CMD 06H CMD 06H
Parameter address high bits 4CH Parameter address high bits 4CH
Parameter address low bits 10H Parameter address low bits 10H
Writing data high bits 00H Number of function parameters 00H
Writing data low bits 02H CRC high bits 02H
CRC high bits 1FH CRC high bits 1FH
CRC low bits 5EH CRC low bits 5EH