79
10 Supplement
VEGAPULS 69 • Modbus and Levelmaster protocol
47252-EN-210205
register. For this, a configuration in the host is required. Floating point numbers with short prevision
(4 bytes) according to IEEE 754 are transmitted with individually selectable order of the data bytes
(byte transmission order). This "
Byte transmission order
" is determined in the parameter "
Format
Code
". Hence the RTU knows the registers of the VEGAPULS 69 which must be contacted for the
variables and status information.
Format Code
Byte transmission order
0
ABCD
1
CDAB
2
DCBA
3
BADC
10.4 Modbus register
Holding Register
The Holding registers consist of 16 bit. They can be read and written. Before each command, the
address (1 byte), after each command, a CRC (2 byte) is sent.
Register Name Register Number
Type
Configurable Values
Default
Value
Unit
Address
200
Word
1 … 255
246
–
Baud Rate
201
Word
1200, 2400, 4800, 9600,
19200, 38400, 57600
9600
–
Parity
202
Word
0 = None, 1 = Odd, 2 =
Even
0
–
Stopbits
203
Word
1 = None, 2 = Two
1
–
Delay Time
206
Word
10 … 250
50
ms
Byte Oder (Float-
ing point format)
3000
Word
0, 1, 2, 3
0
–
Input register
The input registers consist of 16 bits. They can only be read. The address (1 byte) is sent before
each command, a CRC (2 bytes) after each command. PV, SV, TV and QV can be set via the sensor
DTM.
Register Name
Register Number Type
Note
Status
100
DWord
Bit 0: Invalid Measurement Value PV
Bit 1: Invalid Measurement Value SV
Bit 2: Invalid Measurement Value TV
Bit 3: Invalid Measurement Value QV
PV Unit
104
DWord
Unit Code
PV
106
Primary Variable in Byte Order CDAB
SV Unit
108
DWord
Unit Code
SV
110
Secondary Variable in Byte Order CDAB
TV Unit
112
DWord
Unit Code
