Agilent Technologies ESG Especificaciones descargar pdf (Pagina 19)

Programming Guide 1-15

ESG Family Signal Generators Preparing for Use

Transferring Data

Modem Line Handshaking

Modem line handshaking, when used, is performed automatically by the computer as part

of the OUTPUT or ENTER operation. If the modem line states have not been latched in a

fixed state by Control Register, the following sequence of events is executed automatically

during each OUTPUT or ENTER operation:

For OUTPUT operations:

1. Set Data Terminal Ready and Request-to-Send modem lines to active state.

2. Check Data Set Ready and Clear-to-Send modem lines to be sure they are active.

3. Send information to the interface and then to the peripheral.

4. After data transfer is complete, clear Data Terminal Ready and Request-to-Send

signals.

For ENTER operations:

1. Set Data Terminal Ready line to active state. Leave Request-to-Send inactive.

2. Check Data Set Ready and Data Carrier Detect modem lines to be sure they are active.

3. Input information from the interface as it is received from the peripheral.

4. After the input operation is complete, clear the Data Terminal Ready signal.

After a given OUTPUT or ENTER operation is completed, the program continues

execution on the next line.

Control Register 5 can be used to force selected modem control lines to their active states.

The Data Rate Select line is set or cleared by bit 2. Request-to-send and Data Terminal

Ready are held in their active states when bits 1 and 0 are true, respectively. If bits 1 or 0

are false, the corresponding modem line is toggled during OUTPUT or ENTER as

explained previously.

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Agilent Technologies ESG Especificaciones Pagina 19