Why My Rs485 Cable Is Better Than Yours > 자유게시판

With careful design, many peripherals can communicate via the SPI, rs485 cable and powerful multi-processor systems can be linked using this high speed bus. The QED-Forth kernel includes pre-coded drivers that configure and control the SPI for maximum speed data transfers. This menu includes a function to adjust the Modbus ID number and a screen cleaning function. You can open via the gear in the upper right corner an option menu. The RS-485 port can be accessed through the DB9 port or the solder points on the PCB. It does not specify or recommend any communications protocol; Other standards define the protocols for communication over an RS-485 link. On the other hand, RS485 is more industry-based communication which is developed for a network of multiple devices that can be used over long distances and at greater speeds too. This person has proved that it can be done (see link). You need to use the latest Raspbian Jessie release and disable the built in Bluetooth to use the RS485 Pi on the Raspberry Pi 3, see our KB page for the config changes needed. Before using the RS485 Pi you will need to solder both connectors onto the PCB. It combines two industry standard digital communication protocols (SDI-12 & RS485) and is suited for environmental monitoring applications using existing SDI-12 monitoring equipment.

The RS485 connection allows users to retrieve both level and temperature data, interface with a PC, and rescale the analog output from 10% to 110% of the basic range (converter cable and Keller software required). Output is shown below. The DB9 socket uses three wires as shown on the diagram below. The pinout of the QScreen’s Serial Header (H5), QScreen’s Field Header (H3), and the Serial Connectors are shown in the following tables. The advantage of using Serial1 for RS485 is that the Serial1 RS485 signals are also available on the Docking Panel, while the Serial2 RS485 signals are available only on the PDQ Board’s Serial Communications Header. The PDQ Single Board Computer (SBC) has two asynchronous serial communications ports named Serial1 and Serial2. Discount 80% Offer 12v 24v 36v 48V 60v 72v 96V DC to AC 220V 110V 16000W High power pure sine wave inverter motherboard PCB circuit board 48 tubes with FREE Shipping Worldwide Now!

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For simple tests a serial connection via USB cable between your PC and the NodeMCU will also work. Move the serial cable from the "Serial Port 1" connector to the "Serial Port 2" connector on the QScreen. There are surface-mount resistor pads on the Docking Panel to bring out the RS485 signals to the DB9 Serial 1 Connector. For example, at 4800 baud (bits per second), each bit lasts about 200 microseconds (µs), and if communications are full duplex (e.g., if the QScreen Controller echoes each incoming character), then there is a serial interrupt every 100 µs or so. The manufacturer did not bring the 5 volt connector out to the jumper block, but it is available there on the jumper pin. We suggest soldering the 40 pin GPIO connector first and then the DB9 connector. The RS485 Pi is supplied with the 40 pin GPIO connector and the DB9 connector unsoldered. The RS-485 port on the RS485 Pi can be accessed through the male DB9 socket or the solder points on the PCB. It is not a standard Communication protocol, but it is a physical circuit with which you can transmit and receive serial data with other peripherals. Utilizing the downloaded driver, the USB will operate as a virtual Com port, which allows a user to communicate with the RS485 system as a standard PC serial emulation port.