Gossen Metrawatt GmbH U228X-W4, U238X-W4

Table of Contents

1 General ........................................................................................................................................................... 1

Scope of Functions of the TCP/IP Interface ............................................................................................ 1

Electrical Connection ............................................................................................................................... 1

2 Application Notes ............................................................................................................................................ 2

General Notes on Initial Start-Up ............................................................................................................. 2

Physical Characteristics ........................................................................................................................... 2

Display at the LCD ................................................................................................................................... 2

TCP/IP Meter Configuration ..................................................................................................................... 3

NTP Network and Server ......................................................................................................................... 6

2.5.1 Setting up the Network for NTP ........................................................................................................... 6

2.5.2 Setting up the NTP Server ................................................................................................................... 7

Webserver Deactivation ........................................................................................................................... 8

Firmware Update.................................................................................................................................... 11

Tariff Change via Interface ..................................................................................................................... 12

Operating Logbook ................................................................................................................................ 12

Meter Reading Profile (order feature Z1) ............................................................................................. 13

Certified Meter Reading Profile (order feature Z1) .............................................................................. 15

Calibration Logbook (order feature Z2) ................................................................................................ 19

Cutoff Date Meter ................................................................................................................................. 19

Resettable Meter .................................................................................................................................. 19

Clock Internal Power Reserve ............................................................................................................. 20

3 Modbus TCP ................................................................................................................................................. 21

Introduction ............................................................................................................................................ 21

OSI Model .............................................................................................................................................. 21

Modbus TCP Protocol Layout ................................................................................................................ 22

Protocol Data Unit (PDU) ....................................................................................................................... 23

Data Content of the Various Function Codes ........................................................................................ 24

3.5.1 Function Code 3 – Read Parameters: ................................................................................................ 24

3.5.2 Function Code 4 – Read Measured Values ....................................................................................... 24

3.5.3 Function Code 16 – Write Parameters ............................................................................................... 24

Error Handling ........................................................................................................................................ 25

TCP Address Space .............................................................................................................................. 25

Overview of Modbus TCP Address Space ............................................................................................ 26

Details Concerning Address Space and Variables ................................................................................ 28

3.9.1 Address Space with Flexible Addressing (Modbus standard) ............................................................ 28

3.9.1.1 Address Space with Flexible Addressing for Order Features Z0 and Z1 ................................. 28

3.9.1.2 Address Space with Flexible Addressing for Order Feature Z2 ............................................... 39

3.9.2 Address Space with Fixed Block Size ................................................................................................ 51

3.9.2.1 Address Space with Fixed Block Size for Order Features Z0 and Z1 ...................................... 51

3.9.2.2 Address Space with Fixed Block Size for Order Feature Z2 .................................................... 52

3.9.3 Variable Types ................................................................................................................................... 52

Format Types ....................................................................................................................................... 53