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4.8. High-speed simulcasting（1M）
Support large file high-speed connection, the actual network reception of large files depends on the serial port baud
rate, the larger the baud rate, the larger the support for large files, the network transmission is not affected.
Regarding high-speed simulcasting, the following issues need to be noted:
1.
Serial port chip must be able to support to 1M baud rate model, the company test backplane using CP2102
series;
2.
Serial port assistant software must be able to support to 1M baud rate, the company test use software is
XCOM2.6;
3.
The connection between the device and the PC should try not to go through the USB converter and connect
directly to the USB3.0 port of the PC, otherwise it is easy to lose packets;
4.9. Modbus gateway
4.9.1. Simple protocol conversion
Simple protocol conversion: Convert Modbus RTU data to Modbus TCP data, or convert Modbus TCP data to
Modbus RTU data to achieve Ethernet Modbus data and serial port Modbus data is transferred interchangeably.
4.9.2. Multi-host gateway
For simple protocol conversion, there can only be one Modbus master, and the function upgrade is carried out, and
when multiple hosts access the Modbus gateway at the same time, the bus occupancy scheduling will be carried out,
thus solving the bus conflict problem (currently only 8 host connections are supported), and only support working
in TCP Server mode.
4.9.3. Storage gateway
Based on the multi-host development to optimize the network side read speed of the gateway, storage network side
issued by the read instructions, when the network side reads the stored instructions, the gateway will replace the
RTU device to quickly reply to modBUS TCP instructions, the serial port side automatically polls the RTU device
register during the instruction storage time to update the data.
As an upgraded version of the multi-host mode, the storage gateway can only work in tcp server mode, which
improves the response speed of the network side.
Peculiarity:
The gateway allocates a total of 3K space for storing instructions and returning results;
RTU responds to timeout automatic deletion of storage instructions to ensure the real-time nature of data;
The gateway polls the RTU device according to the instruction storage time used for configuration, the
MODBUS host does not query the instruction again at the storage time, and the gateway automatically deletes
the storage instruction to free up memory;
The first instruction is transmitted directly to the RTU device;
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NA611-S & NA611-SA User Manual
第 33
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