Storage Gateway; Configurable Gateway - Ebyte EBT3001 User Manual

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Chengdu Ebyte Electronic Technology Co.,Ltd.

EBT3001 User Manual

4.4.4 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 5K cache for storing instructions and returning results (reading 10 holding registers as an example,

it can store 189 instructions and return results);

(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;

(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 (upper computer, web page) :

The gateway automatically polls the RTU device registers according to the pre-configured MODBUS commands (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 shorten the

response time (query configured commands). Due to the above features, the serial port side of the configurable gateway

can only be connected to Modbus slaves.

Add instruction, left for the upper computer, right for the web page

Instruction storage description (Add instruction, Left picture software right picture web page):

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