Measurement-computing Digital232 Manual do Utilizador descarregar pdf (Página 26)

Section 3 Command Descriptions

3.4

BIT CLEAR Bn

The

Bit Clear

command will clear to a logic zero an output bit described by the

argument '

'. Clearing a bit may represent either a 0 volt or +5 volt output, depending

on whether an

Invert

command (

I16

) has been sent. If data is active high (default

condition), then

Bit Clear

outputs 0 volts. When multiple

Bit Clear

commands are

used in the same command string, an

Execute

command (

) must follow each

command.

The bit which is being cleared must have been defined as an output by the

Configure

command in order to be valid, otherwise the

Digital232

will generate a

Conflict Error.

The

Strobe

and

Inhibit

output lines are not pulsed when the

Bit Clear

command

is sent.

Bit n (1 thru 40) is cleared to a logic 0

Example:

reset the

Digital232

configure all ports as output

A7XA8XA9

set bits 7, 8, and 9 to +5 volts

clear bit 7 to zero volts

B8XB9

clear bits 8 and 9 to zero volts

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 58 59

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