Overview eBus / module bus

The tried-and-tested, robust eBus interface is the most common way to connect KBR devices with the higher-level software. A bus master ensures time and period synchronous measurement and recording for all connected devices. The KBR module bus, on the other hand, is the best choice to expand modular device combinations. In general, the module bus is also used to provide energy supply to the connected modules. Observe the applicable guidelines to ensure faultless operation.

KBR eBus

Nearly all stand-alone measuring and recording devices are equipped with a serial eBus interface according to the standard RS 485. It is the basis for communication in the field bus area. In comparison to other bus systems such as the Modbus or Profibus, it offers special advantages for energy data management such as time and period synchronization. The physical structure consists of serial RS 485 segments that are connected to the local system centers (bus master) either directly or via TCP/IP gateways. The bus masters not only synchronize the individual bus segments and devices but also link the bus devices to the visual energy 4 web.

The KBR eBus is based on the EIA RS-485 standard. It consists of a 2-wire line and works according to the master/slave principle. This means that there is only one master at the eBus, which automatically sends requests to the other bus devices (slaves) and analyzes their responses. All devices with the KBR eBus interface are available as slaves.

Please observe the eBus setup guideline 153 KB

KBR module bus

The KBR module bus is designed to connect KBR eBus devices with different expansion modules. At the same time, the user can establish a data connection and supply the modules with energy by connecting the configured cable bridges. Wiring errors, the most common cause of errors, is thus largely ruled out. The module bus is equipped with a 6-pin plug-in connector RJ12 (6P6C) as a physical interface. This cable connection commonly used in telephone technology can be easily established by the customer with a crimping tool.

Please observe the module bus setup guideline 522 KB

Module bus power supply

The modules are supplied via the module bus. The power supply unit of the supply device has to provide the additional power required for the devices connected. Depending on the supply device, the number of devices connected is limited. The power consumption of the individual modules differs and can also depend on the respective input status. The following table lists the power consumption and output in the worst case scenario:

Power consumption of module bus devices:

Leistungsaufnahme Modulbusgeräte:

Type Consumption Output
multicomp ..D6   9,0W
multisio ..D6   9,0W 
multimax ..D6   9,0W 
multisys ..D4-PS24V   10,0W 
multisys ..D2-BSBS   5,0W 
multisys ..D2-ESBS   5,0W 
multisys ..D2-BSET   4,0W 
multisio ..D2-4DI 2,0W   
multisio ..D2-4AI 1,0W   
multisio ..D2-4CI 1,2W   
multisio ..D2-1TI2RO 1,0W   
multisio ..D2-4RO 1,3W   
multisio ..D2-4RO-ISO 1,3W   
multisio ..D2-4TI 1,0W   
multimess ..D4-BS  0,0W   
Display ..-DS 1,0W  

Module bus connector

The module bus is equipped with a 6-pin plug-in connector RJ12 (6P6C) as a physical interface. This cable connection commonly used in telephone technology can be easily
made by the customer with a crimping tool. The cables are set up as a 6-pin one-to-one configuration as follows:


When expanding the system, one of the most important aspects is to make sure that only one active device is connected to the power supply of the module bus devices at a time. If several devices with active power supply are interconnected, this could damage supply the power units. For assembly and wiring, please observe the applicable VDE regulations!