I/O modules

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Welcome at our website!

Our company is grounded at 1949 in Berlin Germany. The name Rüster stands for High Quality and Service since the start of the company.

Rüster develops and manufactures a wide range of sensors and transmitters for Industrial and HVAC proposes. With our new line of products we decided that it was time to show the world our Unique solutions for HVAC applications.

Our products are not only Innovative and High Quality but also excellent priced!

Rüster building controls is a part of Paul Rüster & Co GmbH

Paul Rüster & Co.GmbH

Paul Rüster & Co GmbH grounded in 1949 in Berlin Germany by Paul Rüster. Rüster is from the start of the company well known as developer and manufacture of innovative and High quality pressure transmitters, resistance thermometers for control of motors and generators, humidity sensing etc (with or without EX approval)

In our industrial delivery program there is a wide range of EX sensors and transmitters, sensors and transmitters special developed for sea going vessels, trains and offshore etc. All these solutions can be ordered with or without calibration!

Our success as a producing company is largely a function of how quickly it responds to new market requirments. Therfore our working methods are state of the art. In certain areas we cooperate closely with Universities, Institutes and partners.

Paul Rüster & Co GmbH is a ISO 9001 approved company.
Want to know more about our possibillitys and solutions? Contact our sales department for more information!

Rüster I/O Modules

Rüster I/O Modules are developed and manufactured with great care! With Innovation, high quality and pricing in mind we offer I/O modules for Modbus and Bacnet communication.


The SMT-IO is developed to provide our customers wit a new way to create an cost effective climate control system.  The Powerful SMT-IO modbus interface is designed to provide additional in and outputs to any Modbus networking system.

The SMT-IO has a comprehensive Modbus object list witch allows to controland view all relay actions by any modbus master device. The inputs can be configured to accapt a digital input or a passive temperature input.


10 Volt free relays, change over contacts 24V @ 5A

8 Universal inputs ( 0..10Vdc/NTC10k II/Digital On/Off)

2 0..10Vdc analogue outputs

Modbus RTU Communication

LED status and Diagnostics

24V powered


Price D.G.




Unique compact & flush mounted I/O module special designed for use in inwall installation boxes or situations where only a few digital in & outputs are required.




2 Volt free inputs,

2 Relay outputs 230Vac @ 3A

24Vdc power supply

Modbus RTU Communication

LED status and Diagnostics


Price D.G.


I/o modules


New Modbus RTU I/O module range. These are developed to provide measurment and control options in situations where no communicative solutions are available.


Communicaion rate 9600 to 57.6k baud

Power supply 24Vsc

Connection WAGO cage clamp connectors

Din rail mounting

LED status and Diagnostics

Type Price D.G.
24 digital inputs 24Vac/dc
Galvanic separation 
RBC-A-DO18 18 digital outputs 24Vdc 300mA
Galvanic separation 
RBC-A-RDO12 12 digital outputs 250Vac6A  445,00C
RBC-A-AI12 12 universal inputs 0..10Vdc/4..20mA/
Ni1000 or Pt1000
12 bit resoluion 
RBC-A-AO8U 8 Analogue outputs 0..10Vdc
12 bit resoluion 
RBC-A-AO8I 18 Analogue outputs 4..20mA
12 bit resoluion  
RBC-A-PDO6N6 6 analogue inputs Ni1000/Pt1000
6 digital outputs 24Vdc 1A 
Galvanic separation 
RBC-A-UI8DO8 8 universal inputs*
8 digital outputs 24Vdc 300mA
Galvanic separation 
RBC-A-UI8RDO8 8 universal inputs*
8 digital outputs 230Vac/24Vdc 2A
RBC-A-UI8AO8U 8 universal inputs*
8 Analogue outputs 0..10Vdc
12 bit resoluion  
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Rüster Product News

Flush mounted I/O module with Modbus RTU communication protocol. The unique and compact RBC-I/O is especcially designed to meet the wishes of our customers for a compact contol module witch can switch lightning , sun blinds etc.

For more information about this new unique product, contact our sales department!

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Rüster News


Rüster is proud to inform you that our industrial resistance thermometers and thermocouples are now available with GL certification

GL certification is especially needed when used in Maritime environment

Read more!

Rüster Worldwide

We deliver Worldwide!

Ask our sales department about your possibility's!

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