KROHNE GFC 300 Modbus - Manual (Page 2)

CONTENTS
2 www.krohne.com 03/2012 - 7312402100 - AD Modbus GFC 300 R01 en
GFC 300
1 Important information 3
2 Technical data 4
2.1 General technical data ..................................................................................................... 4
2.2 Technical data of the Modbus interface (acc. to EIA standards) ..................................... 4
3 Connection in bus systems 5
4 Local configuration 6
5 Electrical connection 7
6 Modbus protocol 9
6.1 General information concerning the protocol ................................................................. 9
6.2 RTU frame format............................................................................................................. 9
6.3 Addressing...................................................................................................................... 10
6.4 Overview of supported functions.................................................................................... 10
6.5 Device identification on the Modbus interface............................................................... 11
6.6 Coil registers .................................................................................................................. 11
6.6.1 Converter controls ................................................................................................................ 11
6.6.2 Counter controls ................................................................................................................... 12
6.6.3 Start calibration functions .................................................................................................... 12
6.7 Input registers ................................................................................................................ 12
6.8 Holding registers............................................................................................................ 14
6.8.1 Counter parameters ............................................................................................................. 15
6.8.2 Process input parameters .................................................................................................... 16
6.8.3 Modbus parameters.............................................................................................................. 17
6.9 Diagnostics ..................................................................................................................... 17
7 Notes 18