# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
RS485
RS485 is a standard defining the electrical characteristics of drivers and receivers for use in serial communications systems. Virtually all alarm systems use a RS485 data bus to connect all wired components that need to communicate with the endstation.
RS485是定义串行通信系统中使用的驱动器和接收器的电气特性的标准。基本上所有的报警系统使用RS485数据总线连接需要和主机通讯的有线设备。
Typically when wiring the endstation to a keypad, tag reader, expansion module etc. there are four wires that need connecting:
- D1 - 0v
- D2 - +12v (This is not to be connected when the device is powered by a local power supply)
- D3 - Data
- D4 - Data
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