Measurement Computing Digital488/80A - Manual (Page 70)

P - Port Select
SYNTAX Pn Select port(s) n for data I/O, where n = value from 0 to 5 .
P0 (Default) Select all 5 ports.
P1 Select Port 1.
P2 Select Port 2.
P3 Select Port 3.
P4 Select Port 4.
P5 Select Port 5.
P? Returns current port(s) selection n .
DESCRIPTION
The Port Select (
P ) command determines which port is selected for data input/output. In the default mode P0 , all 5
ports are selected. Modes P1 through P5 select a specific 8-bit port.
It is recommended that the Bus Input/Output (
G ) command be used with mode P0 to select which type of port data
(input or output) is sent, when the Digital488/80A is addressed to Talk. Data in modes P1 through P5 are input or
output in groups of 8 bits.
EXAMPLE
PRINT#1,"CLEAR08" Line 1: Reset the Digital488/80A.
PRINT#1,"OUTPUT08;P4X" Line 2: Select Port 4.
64 Digital488/80A Commands 967695 Digital488/80A User's Manual