Measurement-computing Digital488/80A Manuel d'utilisateur télécharger pdf (Page 54)

B - Bit Clear

SYNTAX

Bbit Clear bit to logic 0, where bit = bit value from 1 to 40.

B? Returns bit of the last bit that was cleared.

DESCRIPTION

The Bit Clear (

B) command clears to a logic 0 an output bit described by the argument bit. Clearing a bit may

represent either a 0 volt or a +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. If multiple bits are to be cleared within the same

command string, then an Execute (

X) command must follow every Bit Clear (B) command.

To be valid, the bit being cleared must have been configured as an output bit, by the Configuration (

C) command. The

Data Strobe output line is not pulsed when the Bit Clear (B) command is sent.

CAUTION

Because the Configuration (C) command is used, the following programming

example(s) will not work properly if the HVCX1 option is installed with a conflicting

hardware configuration. To be safe, remove the HVCX1 board and replace it with the

jumper board to run the example(s).

EXAMPLE

PRINT#1,"CLEAR08"

Line 1: Reset the Digital488/80A.

PRINT#1,"OUTPUT08;C5P0X"

Line 2: Configure all 5 ports as output; select all 5 ports.

PRINT#1,"OUTPUT08;A7X A8X A9X"

Line 3: Set Bits 7, 8, 9 to a logic 1 (+5 volts).

PRINT#1,"OUTPUT08;B7X"

Line 4: Clear Bit 7 to a logic 0 (0 volts).

PRINT#1,"OUTPUT08;B8X B9X"

Line 5: Clear Bits 8 and 9 to a logic 0 (0 volts).

48 Digital488/80A Commands

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Measurement-computing Digital488/80A Manuel d'utilisateur Page 54