Measurement-computing Digital488 Uživatelský manuál stáhnout pdf (Strana 50)

Section 3 Command Descriptions

3.20

Invert In

The

Invert

command is used to change the polarity of the handshake and data

lines. At power up all handshake and control lines are active high (logic one = + 5

volts). The

Invert

command can selectively change the polarity of each of the

handshake lines, and of the data lines. If multiple

Invert

commands are contained

within the same string, then an

Execute

command (

) should be included between

each

Invert

command. An alternative is to add the values of each

Invert

command

desired, and send one command with the sum of the desired commands. The

Invert

commands are ORed together as received. To delete any one command, it is necessary

to program the default mode

, then reprogram the desired commands.

All control lines are active high, all data lines are high true

I1 Inhibit

output is active low

I2 Trigger

output is active low

I4 Data Strobe

output is active low

I8 Clear

output is active low

I16 Data

is low true

I32 EDR

input is falling-edge sensitive

I64 Service

input is falling-edge sensitive

Example:

CLEAR 718

reset the

Digital488

OUTPUT 718;"I32XI64X"

select EDR and Service input as

falling-edge sensitive

Note:

OUTPUT 718;"I96X"

performs the same function as above

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