Omega DP41-B Series User Manual page 87

Example 3: For 3 bytes data registers: as shown on the Figure 8.1 as 3
the Command sent section:
01 03 0001 0001 D5CA: is to read Setpoint 1 value (SP1).
FUNCTION
DEVICE
ADDRESS
03 or 04
01
01 03 04 0010 0064 FA1D: 3
responded to the 3
DEVICE FUNCTION
ADDRESS
01
NOTE: SetPoints, In/Output Offset and process values (Main, Peak and Valley
Reading Values) must be determined in following manner: (using above example)
Value
Format
Hex. 00
Binary bits
N/A
pattern
Binary N/A
Setpoints,
In/Output
Offset,
N/A
Main/ Peak/
Valley
Readings
Equivalent
Decimal
Table 8.1 Format of 3 bytes Data Value Description of SetPoints,
For detail description of How to determine Sign (+ or -) and Decimal Point Position,
refer to Section 10.28 and Table 10.16 of Communication Manual.
CODE
STARTING REGISTER
03 00
rd
rd
read command.
NUMBER
CODE OF BYTES
03 04
10
XXXX
(binary bits)
0001
X XXX
0 001
DECIMAL
SIGN
POINT
FFFF.
+
In/Output Offset and process values.
DATA
NUMBER OF REGISTERS
01 00
Command Response on Figure 8.1 which device
VALUES OF REGISTERS
(3 Bytes)
00
10
(N/A)
VALUES OF REGISTERS
(3 Hex. Bytes)
XXXX
XXXX XXXX
(binary
(binary bits)
bits)
0000 0000 0000
Absolute
Absolute Value
Value
100 (decimal)
+100.
M - 8
rd
data string of
01 D5
00 64 FA
00 64
XXXX XXXX
(binary bits)
0110 0100
Absolute Value
CRC
CA
CRC
1D