LSIS S100 - Page 148

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RS-485 Communication Features
5.3.1.3 Monitor Registration Detailed Protocol
Monitor registration request is made to designate the type of data that requires continuous
monitoring and periodic updating.
Monitor Registration Request: Registration requests for n addresses (where n refers to the
number of addresses. The addresses do not have to be contiguous.)
ENQ Station ID CMD
Number of
Addresses
Address SUM EOT
05h
‘01’-‘FA’
‘X’
‘1’-‘8’=n
‘XXXX…’
‘XX’
04h
1 byte
2 bytes
1 byte
1 byte
n x 4 bytes
2 bytes
1 byte
Total bytes= (8 + n x 4): a maximum of 40
Monitor Registration Normal Response
ACK
Station ID
CMD
SUM
EOT
06h
‘01’-‘FA’
‘X’
‘XX’
04h
1 byte
2 bytes
1 byte
2 bytes
1 byte
Total bytes=7
Monitor Registration Error Response
NAK
Station ID
CMD
Error Code
SUM
EOT
15h
‘01’-‘FA’
‘X’
‘**’
‘XX’
04h
1 byte
2 bytes
1 byte
2 bytes
2 bytes
1 byte
Total bytes=9
Monitor Registration Perform Request: A data read request for a registered address, received
from a monitor registration request
ENQ
Station ID
CMD
SUM
EOT
05h
‘01’-‘FA’
‘Y’
‘XX’
04h
1 byte
2 bytes
1 byte
2 bytes
1 byte
Total bytes=7
Monitor Registration Execution Normal Response
ACK
Station ID
CMD
Data
SUM
EOT
06h
‘01’-‘FA’
‘Y’
‘XXXX…’
‘XX’
04h
1 byte
2 bytes
1 byte
n x 4 bytes
2 bytes
1 byte
Total bytes= (7 + n x 4): a maximum of 39