Measurement Computing Digital488/80A - Manual (Page 53)

A - Bit Set
SYNTAX Abit Set bit to logic 1, where bit = bit value from 1 to 40 .
A? Returns bit of the last bit that was set.
DESCRIPTION
The Bit Set (
A ) command programs a logic 1 output to a bit described by the argument bit . Setting a bit may
represent either a +5 volt or a 0 volt output, depending on whether an Invert command ( I16 ) has been sent. If data is
active high (default condition), then Bit Set outputs +5 volts. If multiple bits are to be set within the same command
string, then an Execute (
X ) command must follow every Bit Set ( A ) command.
To be valid, the bit being set must have been configured as an output bit, by the Configuration (
C ) command. The Data
Strobe output line is not pulsed when the Bit Set ( A ) 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 1: Using Dual Primary addressing mode to communicate with Channel 0.
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;A22X" Line 3: Set Bit 22 to a logic 1 (+5 volts).
PRINT#1,"OUTPUT08;A23X A24X" Line 4: Set Bits 23 and 24 to a logic 1 (+5 volts).
EXAMPLE 2: Using Secondary addressing mode to communicate with Channel 0.
PRINT#1,"CLEAR0800" Line 1: Reset the Digital488/80A.
PRINT#1,"OUTPUT0800;C5P0X" Line 2: Configure all 5 ports as output; select all 5 ports.
PRINT#1,"OUTPUT0800;A22X" Line 3: Set Bit 22 to a logic 1 (+5 volts).
PRINT#1,"OUTPUT0800;A23X A24X" Line 4: Set Bits 23 and 24 to a logic 1 (+5 volts).
Digital488/80A User’s Manual 967695 Digital488/80A Commands 47