Storage Gateway; Configurable Gateway - Ebyte E90-DTU User Manual

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Chengdu Ebyte Electronic Technology Co.,Ltd.

E90-DTU(433C30E)-V2.0 User Manual

5.8.4. Storage Gateway

The storage gateway not only arbitrates the bus data but also stores the repeated read commands. When different

hosts request the same data, the gateway does not need to query the register status of the RTU device multiple times,

but directly returns the data cached in the storage area. To a certain extent, the multi-host request processing

capability of the gateway is improved, and the time consumed by the entire request process is also shortened. Users

can customize the storage area command polling interval and command storage time according to their needs.

As the optimization of multi-host request performance, the storage gateway can only work in the TCP server mode,

which improves the response speed of the network side.

Features:

(1) The gateway has a 3K cache for storing instructions and returning results (reading 10 holding registers as an

example, about 100 instructions and returning results can be stored);

(2) The RTU response time-out automatically clears the cache to ensure the real-time and authenticity of the data;

(3) The polling interval can be customized, 0-65535ms (default: 500ms);

(4) The gateway will poll the RTU device according to the storage time of the instruction used for configuration. If

the MODBUS host does not query the instruction again during the storage time, the gateway will automatically

delete the storage instruction to release the cache;

(5) The first command and control command (05, 06, 0F, 10 function codes) will directly access the RTU device;

(6) Only 01, 02, 03, 04 Modbus function code query result storage is supported;

Storage gateway configuration (the picture on the left is the host computer, and the picture on the right is the

webpage):

The gateway automatically polls the RTU device register according to the pre-configured MODBUS command

(only supports the configuration of the MODBUS read command), and the commands in the non-storage table will

directly operate the RTU device. Frequently read commands can be stored in the gateway in advance, which can

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