Lammert Bies, RS232 general info

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Interfacing
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RS-232
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Lammert Bies
2001-05-27

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Need some information? RS-232 specifications
UART info
I/O ports and IRQ's
Flow control
Which null modem?

Pin assignment
DB9 to DB25 converter
Loopback test plug
Null modem cables
Printer cable
Monitor cable
PLC cables
Basic programming
Modem programming
Transfer protocols
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Introduction

The RS-232C standard is one of the oldest physical communication standards in computer world. The standard defines low-cost serial communication in a robust way where bits are sent sequentially on a copper line. It was originally defined for connecting peripherals such as terminals and printers to computer systems. Nowadays, the computer to computer link with a so-called null modem cable is commonly used.

The original definition limited the maximum transfer speed to 20 kbps, but practice has shown that higher bandwidth is possible. To overcome these limitations, the RS-232D specification is in preparation.

These pages provide not only information on the standard itself, but also on how to use serial communication in practice. This includes handshaking and how to choose the right null modem cable for computer to computer communication.

If you have anything to contribute to these pages, please let me know by E-mail.

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