Write Scattered 32-Bit Values; Figure 4-3 Write Scattered 32-Bit Request And Response Message Formats - Honeywell UMC800 Reference Manual

Message Exchange Formats

4.4 Write Scattered 32-Bit Values

Introduction
Figure 4-3 shows the Write request and response format for Function Code 3 - Scattered 32-Bit values. This
operation lets you write 32-Bit values to a specific block given the index numbers and the number of values
involved.
Message Formats

Figure 4-3 Write Scattered 32-Bit Request and Response Message Formats

Header
Request Message
READ/WRITE
1 = Write
FUNCTION CODE
3 = Scattered 32 Bit Values
NUMBER OF VALUES REQUESTED
FILLER BYTE: For Word Alignment
TABLE FIELD*
1 = Function Block Configuration Parameters (Static)
2 = Function Block I/O Parameters (Dynamic)
* Configuration Parameters(static) and
I/O parameters(dynamic) cannot be accessed
in the same message since both the Static parameters
and the Dynamic parameters each start at Index Number 0.
Response Message
ACKNOWLEDGE/
UNACKNOWLEDGE
09 = Acknowledge
0a = Unacknowledge
FUNCTION CODE
03 = Scattered 32 Bit Values
(If response is Unacknowledge, then an error code is
returned instead of a function code. See Table 2-1.)
30
Byte 1 Byte 2 Byte 3
0
RS232 Communications Reference Manual
Byte 4 Byte 6 Byte 7 Byte 8 Byte 9 Byte 10
Byte 5
DATA FIELD(Note 1)
Four Bytes of data (32-bit IEEE Floating Point)
for each write value (See Subsection 4.6)
INDEX NUMBER(Note 1)
Index number of the desired
parameter within the selected block
See Parameter Index tables for
Block types in Section 5.
BLOCK NUMBER(Note 1)
Select from LCB Printout.
Note 1. One set of Block and Index with
Four Bytes of data (32-bit IEEE Floating Point)
for each write value requested (See Subsection 4.6)
Data Data Data Data
. . .
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