RS485 interface only supports two-wire system, does not support four-wire system.
Answer(s): B
Users can in which interface upgrade the device version?
Answer(s): A
Which of the following start then the alarm emits a strong sound and light alarm signal to remind the scene of the purpose of attention?
Answer(s): D
When using the PoE (Power over Ethernet) interface, there are two functions of passing and supplying power.
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