Measurement-computing Digital232 Uživatelský manuál stáhnout pdf (Strana 36)

Section 3 Command Descriptions

3.14

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 (X) 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 re-program the desired commands.

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

Inhibit

output

is active low

Trigger

output

is active low

Data Strobe

output

is active low

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:

reset the Digital 232

I32XI64

select EDR and Service

input

falling-edge sensitive

note:

I96 performs the same function as above

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