Why do devices use RS-485 Communications?
RS-485 devices can be connected to a computer and multi-dropped at various locations in a network style configuration. Devices can be up to 4000 feet (1220 meters) feet away before a repeater is needed, and up to 32 nodes (devices) can be connected. More nodes can be connected using repeaters, up to the addressability limit (usually 256) of the devices used. Q: How do I connect my computer to an RS-485 device? A: You can use an RS-232 to RS-485 converter or USB to RS-485 converter, or install an RS-485 interface card in your computer. PCI bus, PCMCIA/CardBus or ISA bus cards can be used. You need to know how many wires are used on the RS-485 port of the device you need to connect. A Data (A) and Data (B) line and ground is a “2-wire” 485 connection, if there are more connections and they are labeled TD(A) & TD(B) and RD(A) & RD(B) and ground, you need a “4-wire” converter. Q: What should I look for in an RS-485 converter to use with Windows? A: A converter or interface card that has Au
