Chengdu Ebyte Electronic Technology Co.,Ltd.
NA111 User Manual
Copyright ©2012–2021
，
Chengdu Eyrth Electronic Technology Co., Ltd
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server mode, improve the response speed on the network side.
peculiarity:
（
1
）
The gateway allocates a total of 5K space for the storage of instructions and returns
results;
（
2
）
RTU responds to timeouts by automatically deleting storage instructions to ensure the
real-time nature of the data;
（
3
）
The gateway polls the RTU device according to the instruction storage time used for the
configuration, the MODBUS host does not query the instruction again during storage time,
and the gateway automatically deletes the storage instruction to free up memory;
（
4
）
The first instruction is transmitted directly to the RTU device;
（
5
）
Only support 01, 02, 03, 04MODBUS function code query results storage;
Figure 4- 10 Storage Gateway
Storage gateway parameter configuration:
（
1
）
Mode configuration: AT is configured as MOD3, web page, computer selection storage
gateway.
（
2
）
Modbus answer timeout configuration: range: 0-65535ms, default: 500ms.
（
3
）
Modbus instruction storage time settings: Range: 0-254s, for instruction storage time
settings, default: 10s.
4.5.4 Configurable gateway
Serial port will automatically poll the RTU device register (only support the configuration of
THEMODBUS read instructions) according to the configured MODBUS instructions, and the
unconfigured instructions and control instructions will operate the RTU device directly. You can
store frequently read instructions in advance in the gateway, reducing response times (querying
configured instructions). Due to the above features, only Modbus from the serial side of the storage
