LSIS 6731001500, User Manual

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369
RS-485 Communication Features
Read Normal Response
Total bytes= (7 x
n
x 4): a maximum of 39
Read Error Response
Total bytes=9
7.3.6.2 Detailed Write Protocol
Write Request
Total bytes= (12 +
n
x 4): a maximum of 44
Write Normal Response
Total bytes= (7 +
n
x 4): a maximum of 39
Write Error Response
ACK Station ID CMD Data SUM EOT
06h ‘01’–‘FA’ ‘R’ ‘XXXX’ ‘XX’ 04h
1 byte 2 bytes 1 byte n x 4 bytes 2 bytes 1 byte
NAK Station ID CMD Error code SUM EOT
15h ‘01’-‘FA’ ‘R’ ‘**’ ‘XX’ 04h
1 byte 2 bytes 1 byte 2 bytes 2 bytes 1 byte
ENQ Station ID CMD Address Number of Addresses Data SUM EOT
05h ‘01’–‘FA’ ‘W’ ‘XXXX’ ‘1’–‘8’ = n ‘XXXX…’ ‘XX’ 04h
1 byte 2 bytes 1 byte 4 bytes 1 byte n x 4 bytes 2 bytes 1 byte
ACK Station ID CMD Data SUM EOT
06h ‘01’–‘FA’ ‘W’ ‘XXXX…’ ‘XX’ 04h
1 byte 2 bytes 1 byte n x 4 bytes 2 bytes 1 byte
NAK Station ID CMD Error Code SUM EOT
15h ‘01’–‘FA’ ‘W’ ‘**’ ‘XX’ 04h
1 byte 2 bytes 1 byte 2 bytes 2 bytes 1 byte