Brand:
- AMX
Models:
- Anything with an RS-485 serial port
Question:
How do you wire a 4 wire RS-485 connection?
Answer:
In theatre and performance venues, RS-485 networks are used to control lighting and other systems using the DMX512 protocol. RS-485 serves as a physical layer for the AES3 digital audio interconnect.
RS-485 is also used in building automation as the simple bus wiring and long cable length is ideal for joining remote devices. It may be used to control video surveillance systems or to interconnect security control panels and devices such as access control card readers.
RS485 and RS422 drive lines in a differential fashion: two wires are required for each signal. The figure below shows a single RS485 / RS422 signal being transmitted. To transmit a logic 1, line B is high and line A is low. To transmit a logic 0, line B is low and line A is high.
