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Issue 17 | June 2012

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Modbus/TCP Master-to-Master Communication

Modbus TCP - Issue 17 | June 2012 A large oil and natural gas platform in the North Sea was expanding their facility capabilities by adding a massive system module (over 1.5 million lbs) to the existing platform infrastructure. In order for the two systems to communicate seamlessly with one another, the proper communication channels needed to be established.

Control systems on each structure were configured to communicate with each other through a serial Modbus RTU RS-232 or RS-485 channel. However, the Modbus device configuration on each side was designed to communicate as a master, while traditional Modbus communication takes place between a master and a slave.

Each structure’s respective developers had invested substantial resources into their control systems, so the systems integrator needed to find a way to overcome this obstacle by converting one configuration to act as a slave in the most cost-effective way possible – or by making two Modbus master devices communicate with one another. Many industry experts have expressed that master-to-master Modbus communication is impossible, but Comtrol had already developed an innovative solution to make a Modbus master communicate with another master.

Read more about Comtrol’s solution >>

TELLUS - Issue 17 | June 2012

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technical corner - Issue 17 | June 2012

DeviceMaster UP Alternative Configuration: “The Serial Port Splitter”

At times we have had customers request the ability to take a signal from one serial port and split it into many serial ports, like a simple sort of “Y cable.” In conventional wisdom, RS-485 and RS-422 are discussed as point-to-point or multidrop and RS-232 as exclusively point-to-point, with neither really being commonly thought to be suitable for splitting.

Well, as it happens, the DeviceMaster UP (DMUP) with Modbus/TCP firmware can be configured as a “serial splitter.”

Learn How »

product spotlight - Issue 17 | June 2012

DeviceMaster UP

DeviceMaster UPThe DeviceMaster UP provides innovative EtherNet/IP™, Modbus, and Profinet IO connectivity to a wide variety of devices. It can enable you to quickly connect PLCs, SCADA, OPC Servers and applications to devices such as barcode scanners, RFID readers, weigh scales, vision systems, printers, encoders, HVAC and sensors.


    • Protocol flexibility

    • Web-based configuration

    • Low latency

    • Extreme temperature ratings

    • Rugged housing

Learn More >>

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