Barriers Of Traditional Modbus Gateway Communication Mechanism – Transparent Mode
Transparent mode communication, using the traditional round-robin polling mechanism, is usually standard in the Modbus gateway market. Gateways performing transparent mode conversions are usually set up easily and quickly. If only a few power meters are connected to a gateway, scan times might not be so much of an issue. However, it’s a very different story when it comes to large-scale networks like DCIMs (for data center power management).
The major concern is the resultant latency in the transparent mode communication, especially during peak traffic periods. It also wastes precious SCADA resources and network bandwidth which can cause delay for the critical command accuracy and sequence.
Intelligent Modbus Gateway Communication Mechanism – Agent Mode
To handle a big amount of collected serial data in the above example, we recommend using high-port density Modbus Gateway such as Moxa MGate MB3660, which gives you an intelligent way to handle multiple devices on a large scale network. It works as the data concentrator to collect all information as an agent. With the agent mode function, you don’t need to waste time to configure hundreds of Modbus commands in a gateway setting. It can reply to the SCADA request immediately with pre-read data without waiting for any slow serial device responses. Using agent mode, this type of intelligent Modbus Gateway can deliver a performance that is more than ten times faster than a traditional round-robin polling mechanism offered in another Modbus Gateway.