Agilent Technologies HP 54601B Specifiche Scaricare il pdf (Pagina 42)

Interface Operation

The oscilloscope can be programmed with a controller over RS-232-C using

either a minimum three-wire or extended hardwire interface. The operation

and exact connections for these interfaces are described in more detail in the

following sections. When you are programming the oscilloscope over

RS-232-C with a controller, you are normally operating directly between two

DTE (Data Terminal Equipment) devices as compared to operating between

a DTE device and a DCE (Data Communications Equipment) device.

When operating directly between two RS-232-C devices, certain

considerations must be taken into account. For three-wire operation, an

XON/XOFF software handshake must be used to handle handshaking

between the devices. For extended hardwire operation, handshaking may be

handled either with XON/XOFF or by manipulating the CTS and RTS lines of

the oscilloscope. For both three-wire and extended hardwire operation, the

DCD and DSR inputs to the oscilloscope must remain high for proper

operation.

With extended hardwire operation, a high on the CTS input allows the

oscilloscope to send data and a low on this line disables the oscilloscope data

transmission. Likewise, a high on the RTS line allows the controller to send

data and a low on this line signals a request for the controller to disable data

transmission. Since three-wire operation has no control over the CTS input,

internal pull-up resistors in the oscilloscope ensure that this line remains high

for proper three-wire operation.

Cables

Selecting a cable for the RS-232-C interface is dependent on your specific

application. The following paragraphs describe which lines of the oscilloscope

are used to control the operation of the RS-232-C bus relative to the

oscilloscope. To locate the proper cable for your application, refer to the

reference manual for your controller. This manual should address the exact

method your controller uses to operate over the RS-232-C bus.

Programming over RS-232-C

Interface Operation

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Agilent Technologies HP 54601B Specifiche Pagina 42