The Ultimate Secret Of RS485 Standard > 자유게시판

These distances can be overcome by running fiber optic cables between the sites and having them connected together via Ethernet gateways. The DyNet network is connected to a server P s OM or USB port and information can then be exchanged via client software running on the server P or clients connecting remotely over the Ethernet network using TP/IP. Remote software updates. Possible upgrade to the innovative iMod platform and NX Dynamics web module. NPE-series devices is an innovative and powerful platform for modern systems and remote monitoring. This remote control functionality can be made available from external locations by making the gateway visible on the Internet, as well as providing remote control within the dwelling via hand-held computing devices such as Palm Pilots, i- Pads and web tablets, via connection to a Wi-Fi hub. 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. Lighting SNVTs (standard network variable type) are supported, as well as user-defined types. In applications where the distance between the Philips Dynalite devices exceeds the RS485 network limit, such as interconnecting separate buildings or linking control centres in a tunnel.

Since the majority of RS-485 applications are driven by a UART, the data rate is usually below 100kbit. In this case, POTS telephone wire should work for quite a long line. Articles, application notes, even data sheets from semiconductor manufacturers discuss both the data rate and line length limits in RS-485. The receiver simply evaluates the difference between the two lines, so that common mode noise on the transmission line will not result in a falsifying of the actual signal. If no occupants have indicated their presence, then the Philips Dynalite control system will switch off the lighting and report this back to the BMS so that the aircondition plant can also be automatically shut down. In a typical application of a high-rise office building, each floor will have its own Philips Dynalite system operating independent of each other. One-way resistor termination: RS-422 networks should only have one resistor at the receiver end.

A gateway that converts the RS-485 data to run over an existing network may cost less in the end than running a kilometer of cable. If your intention is to push the cable length or bit rate to extremes, you should pay careful attention to the cable, drivers, and installation. C1405 and C1406 are for ESD suppression (more on that in a bit). It does not specify bit protocols. RS485's architecture specifies the electrical characteristics of transmitters and receivers, without recommending any specific transmission protocols. RS485's capability to transmit signals as binary 0s and 1s through high and low voltages enables efficient long-distance communication even in environments with electronic noise. This means that low data rates can handle an improperly terminated (or even unterminated) cable better than high data rates. A high speed Ethernet trunk is run between the floors of the building allowing for site-wide command to be sent while each of the floors use a network gateway to spur off and start the network. Philips Dynalite provides several different methods for interfacing with other services, such as building management systems (BMS), projector controllers and audio-visual controllers, blind motors and other third components. 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.

These messages can also be translated into other formats via network gateways, such as into ASII text strings via the DNG232 Network Gateway or back into infrared via the DIRTX8 Infrared Transmitter. The BAnet protocol uses addressable points for communication; these addressing points can be adjusted by the BMS for triggering required functions such as timed events or the Philips Dynalite system for reporting back current system status. The annex of RS-485 states that "When employed, the shield shall be connected only to frame ground at either or both ends depending on the specific application." Shields usually have a lot more copper (and/or aluminum) than a single wire and can therefore carry a lot more current. A single LON message can be sent that can change the Philips Dynalite system to operate between after hour and trading hours mode. To coordinate the different floor systems together, each of the separate sub systems can be linked together via an Ethernet using gateways.

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