User guide

SW USB Series • Operation 16
Example: When a control system issues an SIS input selection command 1! (select input 1),
2! (select input 2), 3! (select input 3), or 4! (select input 4), the SW USB switches to the
corresponding input.The SW USB also passes the SIS input selection command through the
RS-232 Pass Thru port, causing the same input to be selected on the AV switcher.
Commands that cannot be passed through
The following SIS commands cannot be passed through to the AV switcher:
• Information requests: View part number (N), Request information (I), and Query
firmware version (Q)
• Change loop mode (
E
nLOOP)
• Upload firmware (
E
Upload)
See the “Command and Response Table for SIS Commands” in the “SIS Programming
and Control” section for explanations of SIS commands that are performed by the SW USB.
Sending commands to an AV switcher using contact closure
In loop 0 mode, you can select an input on the SW USB by shorting the equivalent pin on
the Contact port to ground (either by pressing a button on a connected contact closure
device or by connecting a jumper between pin 1, 2, 3, or 4 and
_
[ground]). Shorting the
pin to ground issues an input selection command to the SW USB, which passes an SIS input
selection command through its RS-232 Pass Thru port to the AV switcher. The switcher then
switches to the corresponding input.
Example: If you want to select input 1 on the AV switcher, short pin 1 to ground on the
SW USB Contact port. The SW USB switches to input 1 and, simultaneously, the RS-232 Pass
Thru port passes the SIS command 1! to the AV switcher, which also switches to input 1.
The following table shows the SIS commands that are issued when inputs are selected by
contact closure:
Contact Closure
Selection
SIS Command Sent
via RS-232 Pass Thru
Function on the
AV Switcher
Pin 1 to _
1!
Select input 1
Pin 2 to _
2!
Select input 2
Pin 3 to _
3!
Select input 3
Pin 4 to _
4!
Select input 4
Locking and Unlocking the Front Panel (Executive Mode)
Front panel lock mode (executive mode) disables all front panel controls, locking out the
user from those functions. Putting the switcher in this mode enhances security by protecting
against inappropriate or accidental changes to settings. When the SW USB is in lock mode,
RS-232 and contact closure remain available.
• To lock the front panel: Press input buttons 1 and 2 simultaneously and hold them
until the red Exec Mode LED lights (approximately 5 seconds).
1
2
Release buttons.
Press and hold simultaneously
for 5 seconds.
EXEC
MODE
Exec Mode LED lights
to indicate that
lock mode is on.
5 sec.
Figure 10. Enabling Lock Mode
• To exit lock mode: Repeat the procedure described above. When the SW USB is no
longer in lock mode, the Exec Mode LED turns off.