Chengdu Ebyte Electronic Technology Co.,Ltd
NB124S_User Manual
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Chengdu Ebyte Electronic Technology Co.,Ltd
5.4.2 Multi-host mode
Relatively simple protocol conversion can only have one Modbus master station, while the multi-host mode
can access multiple Modbus TCP hosts at the same time. When multiple Modbus hosts access at the same time, the
Modbus gateway will perform bus occupancy scheduling (RS-485 bus Only one request can be processed at a time,
while the multi-host mode will sort and process according to the TCP requests, and other links will wait), thus
solving the problem of bus conflicts (currently, in single-server mode, up to 9 Modbus TCP host connections are
supported, and multiple Attention should be paid to the matching of the request interval and the timeout time,
otherwise the transmission rate of the serial port is much lower than the transmission rate of the Ethernet, resulting
in packet loss. If you need a quick response, it is recommended to use a "storage gateway"), only supports working
in TCP server mode, and the slave can only be on the serial port, otherwise it cannot work normally.
As the number of hosts increases, the Modbus timeout should be increased accordingly. If multiple hosts need
continuous high-speed requests, it is recommended to use "storage gateway", and it is recommended to configure
"simple protocol conversion" when there are no multiple hosts.
