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.

2016年11月29日 · I always thought that the COM port on a classic PC implements the RS-232C serial interface. But I just noticed that the COM port is a DB-25, whereas RS-232C only uses 8 or 9 ports, and therefore tends to use DE-9.

2017年10月23日 · RS-232C with phone connector. Ask Question Asked 7 years, 5 months ago. Modified 7 years, 5 months ago. ...

2016年5月24日 · The RS-232 standard specifies the range as: 0 (space) Asserted +3v to +15v 1 (mark) Deasserted −15v to −3v In addition, inputs must tolerate voltages up to ±25v, and outputs must tolerate indefinite shorts to ground. In the past, a lot of equipment used ±12v since it was available from a minicomputer power supply for example.

2023年1月7日 · Now according to the below documentation, RS-232 actually comes in 3 different flavors (A, B, and C) with each one defining a different voltage range for the on and off levels. The most commonly used variety is RS-232C, which defines a mark (on) bit as a voltage between -3 V and -12 V and a space (off) bit as a voltage between +3 V and +12 V.

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.

2018年12月8日 · I have a GT01 Panasonic LCD which it's interface is RS-232C. I have read that the difference between RS-232 and RS-232C is their voltage level which it's ±5 V in RS232C. Can I use a MAX232 IC to communicate with this LCD? I'm worried that MAX232'c Voltage level (±25 V) harms the LCD.

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.

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2022年2月13日 · In summary, RS-232C describes the hardware characteristics for use in serial communication through a pair of lines (phone lines in this case) between a DTE (Data Terminal Equipment, i.e. computers and terminals) and a DCE (Data Communication Equipment, i.e. modems and other types of communication equipment).