6 Ways You Can Reinvent Rs485 Cable Without Looking Like An Amateur > 자유게시판

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Can I add an RS485 board to a meter later? The connection between the board and the PC is done through the ultra mini serial to DB9 cable and I can successfully read/write data from and to the board. The presence of a new board and the type of board are automatically sensed by the meter’s firmware or by Instrument Setup (IS) software. The Master Brick of each stack has to be the lowermost Brick (except if you are using a Power Supply). Half duplex has the advantage of only using three wires: ARX/ATX, BRX/BTX and GND. By using two jacks, up to 31 L485 boards can be connected in parallel for daisy chaining using readily available CBL03 data cables with no need for a hub. These cables allow the dual RJ11 jacks of the RS485 option board of Laureate meters (digital interface ordering option 2) to be daisy chained and to be addressed digitally with no need for a hub. Laureate RS485 boards are available in versions with dual RJ11 jacks (ordering option 2, board P/N L485) and with dual RJ485 jacks (ordering option 4, board P/N LMOD). The two jacks are wired in parallel by circuit traces on the circuit board.

Anti-inteference layer: Rs485 cables are designed with 2 anti-inteference layers to shield the internal conductors. The shielding may be braided (be formed by a mesh of thin conducting wires) or be a foil (consisting of a sheet of metal wound around the conductors): the two types are equivalent. In RS232 mode all pins are used for RS232 signals. RS485 is specified for multi-point communicates where multiples devices have their own address on the same communication line, while RS232 is only specified for point-to-point communications. Both boards support the Modbus protocol and Laurel’s Custom ASCII protocol, as well as half-duplex or full-duplex RS485 communications. Set the PC to N81 for the Custom ASCII protocol, or to N82 or E81 for the Modbus RTU protocol. A meter will a thermocouple input and set for Modbus RTU needs to set to full duplex even if the wiring and the receiving unit are for half duplex. Bus Probes are very compact (measuring only 40x36mm externally) and sport an attractive look and feel. If the bus is only a few meters long then the cable you use should not matter.

If the bus is longer than a few meters then some kind of twisted pair cable is recommended. The branches must be no longer than 1200 m! The main cable must be no longer than 700 m! I plugged the male-male adapter to the cable and touched the middle pin again, and I could see garbage data again. Another thing I've done is connecting the slave device to to the SENA RS485 adapter, and use the metal piece on the pins, the middle pin of the adapter, when touching the metal, makes the TX led turn on. Laureate meters are modular with a middle slot reserved for a communication board, as illustrated in our Laureates Overview web page. The drivers of RS485 are tristate: Mark, Space and Off. How come reading data from the RS485 adapter never succeeds? RX led. When connecting that RS485 adapter to the PC's COM port, sending data to that port would make the RX led flash.

I am beginning to suspect that the board is not writing to the RS485 adapter correctly, or that pins are not mapped correctly. The board with dual RJ11 jacks is the more popular since is can use commercial straight-through, non-reversing, 6-wire data cables with RJ11 connectors. This can be fatal to your PC or controller. This adaptor connects to the Xwire port on any SPLat controller and converts it to an RS485 interface. RS485 is a balanced serial interface for the transmission of digital data. We installed a new Micro SD card with the latest Raspberry Pi OS, and after updating the software, the serial port and i2c bus were enabled. Wire up the RS485 stacks and set the termination switch on the first and last RS485 Extension in the bus to "on", as shown below. 5 should work in your situation because of the voltage you will be running (5-10V) and your signal is not high frequency (above 500Mhz) in the first place. 12 V, i.e. ±7 V on top of the 0-5 V signal range. RS-485 signals are used in a wide range of computer and automation systems.

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