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Programming
Example 1: Switch position using the *WAI command
the form appropriate for the ROUTE:LAYER:CHANNEL
HP-IB command. For example, if A_position=1 and
B_position=3, then Channel$ would equal "A1,B3".
80
Set Command$ to represent the full HP-IB command to set
the desired switch position, appending Channel$. For the
example Channel$ given above, Command$ would equal
"ROUTE:LAYER1:CHANNEL A1,B3".
90
Send Command$ to the HP 8606X Optical Switch via the
HP-IB interface.
100
Call the subroutine Wait_to_settle.
110 to 150
These lines implement a REPEAT-UNTIL loop that
continuously queries the HP 8606X for error status. The
returned error message(s) are printed to the screen. This
loop exits when the numeric value of the error string equals
0. This will occur when the error message "+0, no
error" is returned.
170
Go to the end of the program.
190 to 230
The wait_for_settle subroutine.
200
Output the *WAI command to the HP 8606X Optical
Switch. This command will prevent the switch from
executing any further commands until the previous
command (that is, the switch setting command) has
completed. When the program continues after the
completion of the command, the switches are guaranteed
to have settled.
210
Output system configuration query to switch.
220
Read back switch configuration. Since this query was
preceded by the *WAI command, the switch movement
must be settled before the query is responded to.
230
Return execution to the line after call to subroutine
(line 110).
4-34
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