Storage Gateway; Configurable Gateway - Ebyte NA111-A User Manual

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4.5.4 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) :

4.5.5 Configurable Gateway

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
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