Spectrum Controls 1769sc-HART Modules - Manual (Page 83)

Chapter 7: Enabling and Using HART on the 1769sc-IF4IH0
User's Manual 0300215-03 Rev. A
7-15
Figure 7-7 Receiving Message
MsgSlaveControl (Hex) =
RR|SS
RR = Page Last Received
SS = Page Being Sent
MsgResponseSize =
Total size of response
message, up to 257 bytes.
MsgResponseBuffer =
One page of data being
sent to the PLC. Last byte
is page checksum. 1 page
= 38 bytes max.
First
Page
Up to 257
Bytes
38 Bytes
Second
Page
nth Page
MsgMasterControl = 00|02
MsgSlaveControl = 02|01
Bytes received <> MsgResponseSize
Message
Returned
MsgSlaveControl (Hex) =
RR|SS
RR = Page Last Received
SS = Page Being Sent
MsgResponseSize =
Total size of response
message, up to 257 bytes.
MsgResponseBuffer =
One page of data being
sent to PLC. Last byte is
page checksum. 1 page =
38 bytes max.
First
Page
Up to 257
Bytes
38 Bytes
Second
Page
nth Page
MsgMasterControl = 01|02
MsgSlaveControl = 02|02
Bytes received <> MsgResponseSize
Message
Returned
MsgSlaveControl (Hex) =
RR|SS
RR = Page Last Received
SS = Page Being Sent
MsgResponseSize =
Total size of response
message, up to 257 bytes.
MsgResponseBuffer =
One page of data being
sent to PLC. Last byte is
page checksum. 1 page =
38 bytes max.
First
Page
Up to 257
Bytes
38 Bytes
Second
Page
nth Page
MsgMasterControl = 02|02
MsgSlaveControl = 02|02
Bytes received = MsgResponseSize
Message
Returned
If checksum
is valid, then
message
complete