Lenze ESVZAR0 RS-485 - Manual (Page 17)

15 CMVMB401C
Modbus Message
6.2 Register Writing
6.2.1 Message structure for reading one word
All writable registers
W SA 06 RH RL DH DL CRCH CRCL
RS SA 06 RH RL DH DL CRCH CRCL
6.3 No Response Conditions
The drive will not respond to any message that:
• contains one or more parity errors
• has an invalid CRC value
• was not directed to the drive’s network address.
• This drive does not support the broadcast function of the Modbus protocol.
• is not at least 8 bytes long (minimum required for the supported functions)
• is more than 18 bytes long (maximum allowed before input buffer overflow occurs)
6.4 Exception Responses
If a valid message is received (i.e. parity, crc, address and message length all pass validity checks), but the message
contents are somehow invalid, the drive will respond with a Modbus exception.
6.4.1 Message structure for an exception response to a read request (03)
W SA 83 EC CRCH CRCL
6.4.2 Message structure for an exception response to a write request (06)
W SA 86 EC CRCH CRCL
6.4.3 Exception Codes (EC)
EC Description
01 Command rejected; Illegal function
02 Invalid register number
03 Data value is out-of-range
04 Wrong data format
06 Slave device (drive) busy