Agilent Technologies 42D Guide de l'utilisateur télécharger pdf (Page 45)

4-5

Programming over RS-232-C

Extended Interface with Hardware Handshake

With the extended interface, both the software and the hardware can control

the data flow between the oscilloscope and the controller. This allows you to

have more control of data flow between devices. The oscilloscope uses the

following connections on its RS-232-C interface for extended interface

communication (on a 25-pin connector):

• Pin 7 SGND (Signal Ground)

• Pin 2 TD (Transmit Data from oscilloscope)

• Pin 3 RD (Receive Data into oscilloscope)

The additional lines you use depends on your controller’s implementation of the

extended hardwire interface.

• Pin 4 RTS (Request To Send) is an output from the oscilloscope which can

be used to control incoming data flow.

• Pin 5 CTS (Clear To Send) is an input to the oscilloscope which controls data

flow from the oscilloscope.

• Pin 6 DSR (Data Set Ready) is an input to the oscilloscope which controls

data flow from the oscilloscope within two bytes.

• Pin 8 DCD (Data Carrier Detect) is an input to the oscilloscope which

controls data flow from the oscilloscope within two bytes.

• Pin 20 DTR (Data Terminal Ready) is an output from the oscilloscope which

is enabled as long as the oscilloscope is turned on.

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Agilent Technologies 42D Guide de l'utilisateur Page 45