Infrastructure/Communication Networks/RS-485

From GridLab
(Difference between revisions)
Jump to: navigation, search
(Addressing)
(Hardware)
 
(One intermediate revision by one user not shown)
Line 1: Line 1:
 
{{public}}
 
{{public}}
 
{{TOC right}}
 
{{TOC right}}
Some workplace installation of the GridLab have a local RS-485 network. This type of network is mainly used to communicate between several devices of the same type and ends usually with a RS-485 to TCP/IP gateway or something like that.
+
Some workplace installation of the GridLab have a local RS-485 network. This type of network is mainly used to communicate between several devices of the same type and ends within the GridLab usually with a RS-485 to TCP/IP gateway or something like that.
  
== Usage within the district units ==
+
== Usage Within the District Units ==
The power meters [[Hardware/Siemens SICAM P50|SICAM P50]], which are a part of the [[Low Voltage GridLab/District Unit/Measurement|District Units]], uses such a RS-485 network. The communication between a master device and the power meters happens over a [[Hardware/Exsys_EX-6051|Exsys EX-6051]] RS-485 to TCP/IP gateway. The configuration of that gateway may be found in the device description of the [[Hardware/Exsys_EX-6051|Exsys EX-6051]] and the [[Infrastructure/Communication Networks/Local Area Network/Internet Protocol/Address List|IP address list]].
+
The power meters [[Hardware/Siemens SICAM P50|SICAM P50]], which are a part of the [[Low Voltage GridLab/District Unit/Measurement|District Units]], uses such a RS-485 network. The communication between a master device and the power meters happens over an [[Hardware/Exsys_EX-6051|Exsys EX-6051]] RS-485 to TCP/IP gateway. The configuration of that gateway may be found in the device description of the [[Hardware/Exsys_EX-6051|Exsys EX-6051]] and the [[Infrastructure/Communication Networks/Local Area Network/Internet Protocol|Internet Protocol]].
  
 
==== Protocol ====
 
==== Protocol ====
Line 25: Line 25:
  
 
==== Hardware ====
 
==== Hardware ====
Description of the connecting cable...
+
The RS-485 bus is connected over a custom cable. A custom cable was necessary because there are different types of devices connected together on the bus. The [[Hardware/Exsys_EX-6051|Exsys EX-6051]] RS-485 to TCP/IP gateway requires another pinout than the [[Hardware/Siemens SICAM P50|SICAM P50]] power meters. The following figure shows the pinning and configuration of that cable.<br><br>
 
+
[[File:District_unit_rs-485_cable_v1_0.png|900px|Pinning and configuration of the RS-485 cable]]
 
+
  
 
[[Category:Infrastructure]]
 
[[Category:Infrastructure]]
 
[[Category:Communication Networks]]
 
[[Category:Communication Networks]]

Latest revision as of 10:52, 21 October 2014

Contents

Some workplace installation of the GridLab have a local RS-485 network. This type of network is mainly used to communicate between several devices of the same type and ends within the GridLab usually with a RS-485 to TCP/IP gateway or something like that.

Usage Within the District Units

The power meters SICAM P50, which are a part of the District Units, uses such a RS-485 network. The communication between a master device and the power meters happens over an Exsys EX-6051 RS-485 to TCP/IP gateway. The configuration of that gateway may be found in the device description of the Exsys EX-6051 and the Internet Protocol.

Protocol

The used protocol is Modbus RTU. The protocol parameters are listed below.

Paramter Value
Protocol Modbus RTU
Baudrate 115200Bd/s
Parity None
Flow Control None

Addressing

The addresses of the power meters consists of two digits. The tens position indicates the District Unit of the power meter and the units position the power meter within the District Unit. So for example the address of the the power meter 4 of the District Unit 2 is 24.

Hardware

The RS-485 bus is connected over a custom cable. A custom cable was necessary because there are different types of devices connected together on the bus. The Exsys EX-6051 RS-485 to TCP/IP gateway requires another pinout than the SICAM P50 power meters. The following figure shows the pinning and configuration of that cable.

Pinning and configuration of the RS-485 cable

Personal tools
Namespaces
Variants
Actions
Navigation
Browse
Toolbox