User Manual

Chapter 7: Enabling and Using HART on the 1769sc-IF4IH0
U ser 's M a n u a l 0 300 21 5- 03 R ev. A
7-15
Figure 7-7 Receiving Message
MsgSlaveCont rol (Hex) =
RR|SS
RR = Page Last Received
SS = Page Being Sent
MsgResponseSize =
Total size of response
mes sa g e , up to 257 bytes.
MsgResponseBuffer =
One p age of dat a being
sent to the PLC. Last byte
is page checksu m. 1 page
= 38 byt es max.
First
Page
Up to 257
Bytes
38 Bytes
Second
Page
nth Page
MsgMasterControl = 00 |02
MsgSla veControl = 02 |0 1
Bytes rec eived <> M sgRespon seSize
Message
Returned
MsgSlaveCont rol (Hex) =
RR|SS
RR = Page Last Received
SS = Page Being Sent
MsgResponseSize =
Total size of response
mes sa g e , up to 257 bytes.
MsgResponseBuffer =
One p age of dat a 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
MsgSla veControl = 02 |0 2
Bytes r eceived <> MsgRespons eS ize
Message
Returned
MsgSlaveCont rol (Hex) =
RR|SS
RR = Page Last Received
SS = Page Being Sent
MsgResponseSize =
Total size of response
mes sa g e , up to 257 bytes.
MsgResponseBuffer =
One p age of dat a 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
MsgSla veControl = 02 |0 2
Bytes r eceived = MsgRespo nseS ize
Message
Returned
If checksum
is valid, then
message
complete