The Basis Of Rs232/expresscard Rs232

RS232 interface is a serial port, computer chassis behind the 9-pin socket

, next to the generally "| O | O |"-like logo. There are two general chassis; new chassis may be only one. Laptops might not. There is much industrial instrumentation it as a standard communication port. The content and format of communication in general attached to the instrument in the user manual.

Computer and computer or data between computers and terminals can be used to send serial communication and parallel communication in two ways. As the serial communication lines with the use of small, low cost, especially in the long-range transmission to avoid a number of lines characteristic of the inconsistency has been widely adopted. In the serial communication, require both a standard communication interface, so that different devices can be easily connected to communicate. RS-232 interface (also known as EIA RS-232-C) is the most commonly used as a serial communication interface. It was in 1970 by the American Electronics Industry Association (EIA) combined Bell system, modem manufacturers and computer terminals manufacturers jointly developed a standard for serial communications. Its full name is "data terminal equipment (DTE) and data communications equipment (DCE) serial binary data exchange interface between the technical standards for" This standard specifies use of a 25-pin DB25 connector, the connector for each cited the signal to be provided for the content of the foot, but also for various signal levels to be provided for.

(1) Not like USB Interface, RS232 Interface signals were actually RS-232-C of the 25 leads many of which are rarely used, and in computer and communication terminals generally use only the 3-9 lead articles. RS-232-C the most commonly used 9 pin signals.

(2) The electrical characteristics of the interface RS-232-C in any one signal line voltage are negative logic. Namely: Logic "1", -5 --15V; logic "0" +5- +15 V. Noise margin of 2V. That is, asking the receiver to identify the signals as low as +3 V as logic "0", high-to-3V signal as logic "1"

(3) The physical structure of the interface RS-232-C interface connector commonly used model for the DB-25 of the 25-pin plugs and sockets, usually at the DCE end plugs and sockets at the DTE side. Some of the equipment and the PC, connected to RS232 ExpressCard, because they do not use each other's transmission control signal, only three interface lines, namely, "send data", "receiving data" and "signal ground."

(4) transmission cable length from the RS-232C standard specifies the code element distortion is less than 4% of the cases, the transmission cable length should be 50 feet, in fact, that 4% of the code element distortion is very conservative, in practice, About 99% of users are 10-20% by-symbol distortion of the wide range of work, so the actual use of the maximum distance would be far more than 50 feet the U.S. company had provisions allowing DEC yards yean distortion of 10% arrived at Schedule 2 the experimental results. One No. 1 cable shielded cable, model DECP.NO.9107723 there are three pairs of twisted pair, each composed by the 22 # AWG, its external covered with shielding net.

by: drogbagoogle

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