Service Manuals, User Guides, Schematic Diagrams or docs for : Agilent 5989-6580EN RS-232 Troubleshooting - Application Note c20140910 [8]

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Keysight Technologies
RS-232 Troubleshooting




        Application Note
Introduction

     In the course of dealing with personal computers, you may use the RS-232 serial interface. This
     application note will describe RS-232 at a basic level, with an orientation towards Windows-based
     instrument programming.



     1. An Overview of RS-232
     The irst question that needs to be addressed is: what precisely is a "serial" interface?

     Consider a computer connected to an instrument or other "remote" device. One of the simplest
     possible communications schemes is shown in Figure 1.

     Each device sends data bits coded as electrical pulses, with a "0" corresponding to a low voltage and a "1" a
     high voltage, to the other over a dedicated line, using a shared ground line. Using separate lines to transmit
     and receive data allows both devices to send data simultaneously without interference, at least in principle.

     For example, to send a byte to the remote device, the computer would have to send as shown in Figure 2.

     There are a wide variety of serial communications schemes. The most popular is RS-232, which is in fact
     so universal that it is often simply referred to as "serial." RS-232 deines various mechanical and electrical
     specs for serial communications.
                                                                           Output                Input
     RS-232 deines legal voltage levels as follows:      0 (mark)           +5 to                +3 to
                                                                         +15 volts DC         +15 volts DC
                                                         1 (space)          

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