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예식일 : RS485 Standard Guide
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EIA-485, also known as TIA/EIA-485 or RS-485, is a standard defining the electrical characteristics of drivers and receivers for use in balanced digital multipoint systems. ANSI/TIA/EIA-485, commonly called RS-485, is a standard defining the physical layer of a two wire multipoint communications network. Conversely, the output that goes low when the input goes high is often called the "inverting" output. This difference in earth ground may be high enough to cause damage to the RS-485 devices, but connecting a third wire between their circuit commons/earth grounds would try to bypass the power earth common (this is often called a ground loop) causing excessive current in the third wire. It also defines three generator interface points (signal lines); A, B and C. The data is transmitted on A and B. C is a ground reference. The ground signal is a common return for all signals. The Philips Dynalite DNG485 Network Bridge converts DyNet into 64xchannels of DMX512 signals. The DyNet network can be used to control the behavior of the system in response to DMX signals, such as the selection of the circuits for which DMX512 control is allowed.

The unit can also receive 1-1V analogue input and directly translated this into Dynet channel level messages. Philips Dynalite sensors are multi-function devices; incorporating motion detection, light level measurement and infrared reception. These IR transmissions can be triggered from any Philips Dynalite user interface such as a pushbutton panel or even a motion sensor. Devices utilizing RS485 can communicate with central control systems using communication protocols such as Modbus and ASCII. Multiple IR codes can be programmed to transmit with the press of one button by using the inbuilt task engine. Can be used with virtual serial ports using Bluetooth serial or a USB to serial converter. When a dry contact closure is detected, the unit can perform a wide variety of functions such as recall a scene or perform a control room join. Some RS-232 to RS-485 converters originally used the handshaking signals such as RTS to control the enable of the RS-485 transmitter. Receiver Input Sensitivity: RS-485 has a receiver input sensitivity of ±200mV, which means a receiver must see signals above or below 200mV to recognize a mark. Philips Dynalite ballast controllers can be configured for -1V output, providing a ready means of communicating a control variable to another system.

POTS telephone cable's impedance is less controlled than CAT cable and can vary from 600 Ω at lower audio frequencies to less than 100 Ω at higher frequencies. The standard does not discuss cable shielding but makes some recommendations on preferred methods of interconnecting the signal reference common and equipment case grounds. Power isolation is achieved by an isolated dc-dc supply, such as Analog Devices, Inc. isoPower™, and signal isolation is achieved via Analog Devices iCoupler® technology. This would be typically be achieved by connecting a theatrical lighting desk onto a DyNet network gateway DNG232, removing the need for the lighting control devices to be double ported for DMX512, apart from a single interface. The DIRTX8 Infrared Transmitter is an 8-channel device, commonly used to integrate equipment with an IR port, such as AV controllers and airconditioners, onto the DyNet network. A typical situation is where small IR emitters are fixed to the IR window of Hi-Fi equipment.

RS-485 usually has a single pair of wires that both the transmitter and receiver are connected to. The RO and DI terminals are the output of the receiver and the output of the driver respectively. Both styles of inputs can be used at the same time so that when a contact closure is detected the analogue inputs are then enabled. You can find further information in the Infosheet. All information below this point is legacy and very questionable. From a software point of view, full-duplex RS-485 looks very similar to RS-232. The optional EnvisionManager Toolbox Software Development Kit provides a rapid integration environment for connection to BMS. As well as control and status reflection of the lighting system, alarm events such circuit breaker trips and lamp failures can be automatically forwarded to the BMS. Note: RS485 CAN Shield can only use a 3.3V power supply, UNO, Leonardo, and other Arduino cannot use the CAN function due to hardware limitations. Low power transceiver for RS-485 communication.

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