Measurement Computing Digital232 - Manual (Page 38)

Section 3 Command Descriptions
3.16
Port Pn
The Port command determines which port is selected for output and input data.
In the default mode (P0), all ports are selected. The P1 thru P5 commands select a
specific eight bit port.
The Output Select (Gn) command is used to determine whether input or output
port data is sent out the serial port when requested. Data in modes P1 through P5 is
input or output in groups of eight bits.
P0 All five ports are selected
P1 Port 1 is selected
P2 Port 2 is selected
P3 Port 3 is selected
P4 Port 4 is selected
P5 Port 5 is selected
Example:
@ reset the Digital 232
P4 select port 4