2008年7月21日 · RS485 is basically a single ended to differential line driver and is commonly used with RS232. So what I told is one of the possibilities. Strictly speaking I suppose any other serial protocol based hardware can also be terminated on 485 driver, so you need to check up with the user manual of the PC to confirm how it is used in this specific case.

2017年9月23日 · It sounds unlikely that the RS485 scale interface works with a RS232-to-USB cable, unless the scale supports both interface standards in parallel on different pins or has a feature to switch the interface type. You should absolutely check the operators manual. RS485 is preferred for longer cables due to higher noise immunity.

如题，串口, UART, RS232, RS485,这些概念都有什么区别跟联系？求硬件大神或通讯大神赐教！还有，有没有…

2008年5月16日 · The RS485 is a bidirectional communication so there is no meaning to use Tx+ or Tx- alone & the best notation is A, B. But unfortunately here i have to use different identification except A, B (example: Tx+, Tx- or D+, D-).

2002年2月15日 · rs485 termination Hello, I have a half duplex RS485 communication between 1 slave and master but was wondering what is the effect of the termination resistor? My length of CAT5 cable is 5 m and the baud rate is 19200. When I add a termination resistor based on the RS485 IC datasheet, the communication is very unstable but when removed it works ...

2010年3月30日 · Re: I2C vs RS485 Hi, I2C (IIC) stands for Inter-Integrated Circuit, so itss designed for data exchange between two integrated circuits (e.g. microcontroller <--> eeprom) which are quite close (normally same PCB). Speed can go up to 400 kHz. Synchronous protocol: Clock + Data. RS-485 is designed for long distance between two devices.

2002年3月22日 · RS485 is two way: multiple transceivers on the bus. Both busses use two-wire differential signals with identical voltage levels. From a hardware point of view it is possible to connect RS422 receivers to an RS485 bus. You cannot place an RS422 transmitter on an RS485 bus. In other words: with a RS422 receiver you can only listen to an RS485 bus.

2013年1月28日 · pic rs485 Hi all. I need RS 485 rx and tx comminication commands for Pic Basic Pro. (use pic 16f84) Thanks. R.Can RAKAN Teknik Danýþman +90.555.311.55.71

2001年7月16日 · One method to minimise this will be to use a serial to paralel shift register on each node and transmit from the receiving node a serial pattern that will enable the RS485 driver from each node separately. The serial shift register (like 74HC595) will be cascaded. So you will have 2 wires RS485, 1 gnd, 3 wire for serial data (data, clk, clear).

2004年7月31日 · The amplifications are done using opamps). Correct me if I'm wrong, RS232 protocol is pretty much the same as RS485. Basically, I would take a look at the TCIP lean book for some ideas as it focusses on the protocol very much -> so you can learn how to modify it to suit the RS485. It's tricky but tell me if there is any success in it. Thanks.