Operation, cont’d
SW USB Series • Operation
3-4
PRELIMINARY
Issuing commands to an Extron A/V switcher via the RS-232
Pass Thru port
To congure the SW USB to pass commands through the RS-232 Pass Thru port to a
connected A/V switcher, you must select a loop mode. The loop mode determines
which types of commands are passed through this port.
The two loop modes are:
• Loop 1 mode — In this mode, SIS commands sent to the SW USB via an
RS-232 interface are passed through the RS-232 Pass Thru port to the A/V
switcher. The RS-232 interface is the only method of issuing commands to the
A/V switcher.
• Loop 0 mode (default) — In this mode, in addition to passing through SIS
commands sent from the computer’s RS-232 interface, the SW USB also passes
input selections entered via contact closure or the front panel buttons through
the RS-232 Pass Thru port to the A/V switcher.
Selecting the loop mode
To select the loop mode, enter one of these Loop commands:
• Loop 1 mode:
E
1LOOP
}
• Loop 0 mode:
E
0LOOP
}
command.
The table below summarizes the two loop modes.
Mode SIS command Commands sent to A/V switcher
through SW USB Pass Thru port
Loop 1
E
1LOOP
}
Only SIS commands received via the
RS-232 control port are passed through
the RS-232 Pass Thru port.
Loop 0
(default
mode)
E
0LOOP
}
Both of the following are available:
• Input selection via contact
closure and front panel buttons
• SIS commands sent via RS-232
interface (loop 1 functionality)
See the command/response table in chapter 4 for an explanation of all supported
SIS commands.
N
In Loop 0 mode, you can still issue commands to the SW USB using the front
panel buttons, RS-232, or contact closure in both loop modes. The loop mode
selection affects only commands coming through the RS-232 Pass Thru port.
SIS command processing
When an A/V switcher is connected to the RS-232 Pass Thru port, SIS commands
are processed in one of the following ways:
• Passed through to the A/V switcher without being acted on by the SW USB
• Performed by the SW USB and not passed through to the A/V switcher
• Performed by the SW USB and passed to the A/V switcher, which also
performs them. This applies only to the input selection command
X!
!, where
X!
is the input number.
The table on the next page shows how the SIS commands are handled by an
SW USB with a connected A/V switcher. (Unless otherwise indicated, commands
are not case-sensitive.)
(19 Seiten)
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