SEKURE SX-3100LCD Manuel de l'opérateur télécharger pdf (Page 70)

58 TESTER

A. UNDERSTANDING RS232

COMMUNICATIONS

RS232 is a standard in the computer industry for serial communications between

computers and peripheral devices. Virtually all small computer systems have at least one

RS232 port. RS232 links are used to communicate with printers, display terminals,

modems, and many types of test equipment.

An RS232 communication link is a serial link as opposed to a parallel link. This means

that data is transmitted serially, one bit after another, over a single data line versus a

number of bits being transmitted simultaneously using multiple data lines as is done in a

parallel link. Remember that the RS232 connection will not work with a device which

uses parallel data. This is important since most printers connected to small computer

systems are parallel printers and will not work with the Tester.

Specifications for the RS232 link are provided on the following page. You should not need

to use this information unless you are trying to connect the Tester to a device other than

those discussed in this manual.

If you are trying to connect an RS232 compatible device to the Tester, you must make sure

that you set it up so that it can communicate with the Tester. If you’re having problems,

refer to the RS232 Interface Signal Specifications and use the following check list:

• Make sure the cable is connected.

• Make sure the other device is “On Line”.

• Make sure the baud rates are the same.

• Make sure the data format is the same.

• Make sure that the signals are connected appropriately between the two devices (the

RS232 Transmit signal must be connected to the other device’s Receive line and vice

versa).

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SEKURE SX-3100LCD Manuel de l'opérateur Page 70