Vega VEGADIF 85 - Modbus Communication Parameters

79
11 Supplement
VEGADIF 85 • Modbus and Levelmaster protocol
53571-EN-230814
Housing material Version Protection acc. to
IEC 60529
Protection acc. to
NEMA
Stainless steel (transmitter, version
with external housing)
IP68 (25 bar) -
Connection of the feeding power supply
unit
Networks of overvoltage category III
Altitude above sea level
Ʋ by default up to 2000 m (6562 ft)
Ʋ with connected overvoltage protection up to 5000 m (16404 ft)
Pollution degree
21)
4
Protection rating (IEC 61010-1) II
11.2 Device communication Modbus
Inthefollowing,thenecessarydevice-specicdetailsareshown.Youcanndfurtherinformationof
Modbus on www.modbus.org.
Parameters for the bus communication
The VEGADIF 85 is preset with the following default values:
Parameter CongurableValues Default Value
Baud Rate 1200, 2400, 4800, 9600, 19200 9600
Start Bits 1 1
Data Bits 7, 8 8
Parity None, Odd, Even None
Stop Bits 1, 2 1
Address range Modbus 1 … 255 246
Startbitsanddatabitscannotbemodied.
Generalcongurationofthehost
Thedataexchangewithstatusandvariablesbetweenelddeviceandhostiscarriedoutvia
register.Forthis,aconguration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 VEGADIF 85 which must be contacted for the
variables and status information.
Format Code Byte transmission order
0 ABCD
1 CDAB
2 DCBA
3 BADC
21)
Whenusedwithfullledhousingprotection.