(Product features: The device has a network port and a serial port (TTL/232/485 is optional, you need to specify it when purchasing, otherwise it will be prepared according to the 232 standard), both support DTU function and support transparent data transmission. There are dual-mode dual-card routers, two outlets are on standby, but only one outlet is required at the same time. When one outlet is blocked, or the signal is poor and dropped, it will automatically switch to another outlet.)
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