Measurement Computing Digital232 - Manual (Page 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 'n'. 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 (X) 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.
Bn Bit n (1 thru 40) is cleared to a logic 0
Example:
@ reset the Digital232
C5 configure all ports as output
A7XA8XA9 set bits 7, 8, and 9 to +5 volts
B7 clear bit 7 to zero volts
B8XB9 clear bits 8 and 9 to zero volts