Цитата их справки:
The ability to put the Modbus Ethernet driver into "single socket" mode is very important for users who are trying to use the Modbus Ethernet driver to talk with a Modbus-Ethernet-to-Modbus-RTU bridge product. Most of these products allow the user to connect multiple RS-485 serial based devices to a single Modbus-Ethernet-to-Modbus-RTU bridge. When a gateway is handling a number of serial devices, the Share a single socket across all devices on this channel option must be unchecked.





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