Spectrum Controls 1769sc-IF4IH User Manual page 82

7-14
Compact IO™ Isolated HART Analog Input Module
Figure 7-6 Sending Message
Message
to be sent
First
Page
Second
Page
Up to 257
Bytes
nth
Page
Message
to be sent
First
Page
Second
Page
Up to 257
Bytes
nth
Page
Message
to be sent
First
Page
Second
Page
Up to 257
Bytes
nth
Page
User' s Manual 0300215-03 Rev. A
MsgMasterControl = 00|01
MsgSlaveControl = 00|00
Bytes sent <> MsgRequestSize
MsgMasterControl = 00|02
MsgSlaveControl = 01|00
Bytes sent <> MsgRequestSize
MsgMasterControl = 00|02
MsgSlaveControl = 02|00
Bytes sent = MsgRequestSize
If checksum
is valid, then
ready to
receive data
from module
38 Bytes
38 Bytes
38 Bytes
MsgMasterControl (Hex) =
RR|SS
RR = Page Last Received
SS = Page Being Sent
MsgRequestSize =
Total size of message in
bytes, up to 257 bytes.
MsgRequestBuffer =
One page of data being sent
to module. Last byte is
page checksum. 1 page =
38 bytes max.
MsgMasterControl (Hex) =
RR|SS
RR = Page Last Received
SS = Page Being Sent
MsgRequestSize =
Total size of message in
bytes, up to 257 bytes.
MsgRequestBuffer =
One page of data being sent
to module. Last byte is
page checksum. 1 page =
38 bytes max.
MsgMasterControl (Hex) =
RR|SS
RR = Page Last Received
SS = Page Being Sent
MsgRequestSize =
Total size of message in
bytes, up to 257 bytes.
MsgRequestBuffer =
One page of data being sent
to module. Last byte is
page checksum. 1 page =
38 bytes max.