Emerson DL8000 - Danload 6000 Protocol Frame

DL8000 Preset Instruction Manual
D-76 Communications Protocols Revised February-2016
D.5 DanLoad 6000 Protocol Frame
The DanLoad 6000 protocol supports a maximum of 256 bytes in one
Request/Response frame. Numeric data is transmitted in binary with
LSB byte first and MSB byte last.
Frame queries, responses, and exception responses using the following
format:
ADR FN D1 D2 Dn BCC1 BCC2
Frame format for Normal Query and Response
ADR
Address Field: 01h to FFh for individual module.
Address = 00h indicates Broadcast Request; means Only
Process this Query But need not to reply back.
FN
Function Fields: 41h or 42h
D1
Data Field character 1 indicates length of data field.
Data Field Length does not include device address, function code,
or CRC bytes
D2
Data field character 2 indicates Command code
D3
Any data.
Note: String data remains Null Terminated in any
Query/Response.
Dn
Data field character n
BCC1
Block check character 1 is Error check field (CRC-16) character 1.
BCC2
Block check character 2 is Error check field (CRC-16) character 2.
Frame format for Exception Response
ADR
Address Field: 01h to FFh for individual module.
FN
Exception Response C1h and C2h for function codes 41h and 42h
respectively.
D1
Data Field character 1 indicates length of data remains 3 which
includes D1, D2 and D3.
Data Field Length does not Include Device address, Function code
and CRC bytes
D2
Data field character 2 indicates Command code
D3
Exception code
BCC1
Block check character 1 is Error check field (CRC-16) character 1.
BCC2
Block check character 2 is Error check field (CRC-16) character 2.