2019年1月29日 · The RS-232 Standard has gone through several revisions over the years. In the original RS-232, the signal would flip between positive and negative 25 volts. Since that point there have been three revisions, RS-232A, RS-232B, and RS-232C; these revisions lowered the acceptable voltage from 25 to 12 to 5 volts respectively.

2024年12月31日 · RS-232 is a communication standard that carries serial TX/RX signals as well as a number of sideband signals for modem control. It's a very old standard, dating from the early 1960s. RS-232 is intended for box-to-box cabling in noisy environments (such as TTY to modem).

2015年8月13日 · RS-232 and RS-485 (and sometimes "TTL", for 0.8V/2.0+V levels) are physical implementations of a serial connection. They define voltage levels for "high" and "low", and how devices are connected together. A UART is the peripheral that implements a serial connection that follows the scheme described at the start.

2024年2月18日 · I am looking at RS-232 control for various TV displays which use a different type of input connector for RS-232. The combination of RS-232 inputs on different TV displays is the standard 9-pin DB9 connector or either a 2.5mm or 3.5mm input. The set-top box that is being linked to each TV uses a 3.5mm connector.

2016年12月11日 · It is the basic chip (or virtual function in a microcontroller) which encodes the data bits serially into a standard format with a start bit, stop bit(s), speed, etc. But "UART" is only PART of what "RS-232" is. RS-232 adds the legacy voltage values to the binary values (0/1 or hi/lo, or "mark" and "space" in RS-232 talk).

2016年12月11日 · A complete RS-232 interface will typically involve both a UART and an RS-232 level converter. Further, the RS-232 standard includes the definition of several other signalling pins besides TX and RX, which you may need to use depending on the equipment you need to connect to. These will also need to be level converted, and your UART may, or may ...

2012年12月26日 · I've read that speed of rs-232 depends on length of cable. There are many different tables that describe this dependency. But speed although should depend on voltage of Rx and Tx signals. How maximum

2015年8月27日 · RS-232 is an interface protocol. It is not designed for long lengths; it is designed to connect endpoints to more capable communications equipment. RS-232 allows you to connect to a modem that is not on your desk, but the one next to it, even if you have to run the cable high enough that people can walk under it.

2018年7月3日 · Whichever pin is RS-232 "Transmitted Data" (probably the one you mention they have labelled as TX) on this DTE device, which will be an output, will need to be connected to the RS-232 "Received Data" pin on your PC (also a DTE device), which is an input (and obviously vice versa for data transfer in the other direction).

2017年5月10日 · RS485 uses +/- 400mV not 0-5V so the termination resistor is smaller wattage than CAN bus. There is an advantage that many (everyone) seems to miss.