User Manual

Compact IO™ Isolated HART Analog Input Module
U ser 's M a n u a l 0 300 21 5- 03 R ev. A
7-14
Figure 7-6 Sending Message
Up to 257
Bytes
MsgMas terControl (Hex) =
RR|SS
RR = Page Last Received
SS = Page Being Sent
MsgReques tSize =
Total size of message in
bytes, up to 257 bytes.
MsgRequestBu ffer =
One page of data being sent
to module. Last byte is
page checksum. 1 page =
38 bytes max.
First
Page
38 Bytes
Second
Page
nth
Page
MsgMasterControl = 00 |02
MsgSla veControl = 01 |0 0
Bytes sent <> MsgRequestSize
Message
to be sent
Up to 257
Bytes
MsgMas terControl (Hex) =
RR|SS
RR = Page Last Received
SS = Page Being Sent
MsgReques tSize =
Total size of message in
bytes, up to 257 bytes.
MsgRequestBu ffer =
One page of data being sent
to module. Last byte is
page checksum. 1 page =
38 bytes max.
First
Page
38 Bytes
Second
Page
nth
Page
MsgMasterControl = 00 |02
MsgSla veControl = 02 |0 0
Bytes sent = MsgRequestSize
Message
to be sent
If checksum
is valid, then
ready to
receive data
from module
MsgMas terControl (Hex) =
RR|SS
RR = Page Last Received
SS = Page Being Sent
MsgReques tSize =
Total size of message in
bytes, up to 257 bytes.
MsgRequestBu ffer =
One page of data being sent
to module. Last byte is
page checksum. 1 page =
38 bytes max.
First
Page
Up to 257
Bytes
38 Bytes
Second
Page
nth
Page
MsgMasterControl = 00 |01
MsgSla veControl = 00 |0 0
Bytes sent <> MsgRequestSize
Message
to be sent