User`s guide

3-2 User’s and Service Guide
Controlling the Test Set and Making Measurements
Commands
Commands
As mentioned earlier, the test set can be controlled in three ways. The
first two involve the use of a separate computer. The third way uses the
network analyzer manually. These methods of control are detailed
below and on the following page.
Computer Control
The first way to control the test set is to write GPIB commands to the
network analyzer which then writes to the test set by way of the
parallel port. See Figure 3-1 for a diagram of connections for this type of
control. The following examples use the variable [D] which is defined in
Table 3-1.
To use a parallel port connection with the 8720D, use a GPIB command
to write bits on the parallel port. The following example assumes that
the address of the network analyzer is 16.
NOTE Be sure to use the ending semi-colon.
The second way to control the test set is to address the 87050A
Option K24 test set directly over GPIB, using a controller to write
directly to the test set GPIB port. The following example assumes that
the address of the test set is 12.
OUTPUT 716;"PARALGPIO;" Sets the parallel port for GP-IO
function
OUTPUT 716;"PARAOUT[D];" Programs all GP-IO output bits (0 to
256) at once
OUTPUT 712;"STRING$"