5. Connect control devices. Connect your computer to one of the
following SW HD 4K communication ports to congure and control
the switcher via SIS commands:
• RS-232 port — Connect the unterminated transmit, receive,
and ground wires of the RS‑232 cable to the provided 3‑pole
captive screw plug, as shown in the illustration at right.
Connect the plug to the rear panel Remote shared connector
(see gures 1 and 2,
F
, on the previous page), and the other
end of the cable to your computer serial port. Protocol for the
RS‑232 port is 9600 baud, 8 data bits, 1 stop bit, no parity.
• Config port — Connect a USB mini‑B cable to the front panel
USB connector (see gures 4 and 5,
C
, on the next page) for
USB control.
6. Enable auto-input switching (optional). Use a jumper wire to connect the pins of the shared 2‑pole captive
screw plug. Attach the plug to the remote RS‑232/Auto switch connector (see gures 1 and 2,
F
) if this was not
done in step 5 for the RS‑232 connection (see the diagram to the right).
7. Connect a contact closure device (optional). Connect a push‑button contact closure device to a Contact
connector (see gures 1 and 2,
D
, on the previous page) to enable input switching via contact closure.
a. Wire and plug one of the provided 3‑pole connectors into a Contact In/Tally Out connector representing the
desired input number on the SW HD 4K (1 or 2 for SW2 models, 1, 2, 3, or 4 for SW4 models).
• Pin 1 = Contact closure input (C)
• Pin 2 = Contact and Tally Ground (G)
• Pin 3 = Tally output (T)
b. Insert the ground wire of the contact device into the Ground slot of the Contact/Tally connector
(pin 2).
c. Press the button on the contact closure device to switch the connected input to the output.
8. Connect an indicator device to the Tally Out port (optional). To identify the currently selected input when the front panel
buttons are not visible, connect a device such as an LED to the Contact In/Tally Out connector (see gures 1 and 2,
D
,on the
previous page) and +V connector (see gures 1 and 2,
E
on the previous page). When the input you are using is selected,
the corresponding tally out pin shorts to ground, which activates the connected indicator.
a. Wire and plug one of the provided 3‑pole connectors into a Contact In/Tally Out connector.
• Pin 1 = Contact closure input (C)
• Pin 2 = Contact and Tally Ground (G)
• Pin 3 = Tally output (T)
b. Insert the power wire for the contact indicator device into the +V connector.
TIP: The Contact and Tally connectors can be used with Extron “Show Me” cables. For each cable, connect the red
pigtail to the associated pin of the Contact Closure input connector and the black pigtail to the associated pin on the
Tally Out connector (see the diagram below).
Tx Rx G
RS-232AUTO
Computer or
Control Syste
SW HD 4K Series Switcher
Rear Panel Remote Port
NOTE: If you use cable that has a drain
wire, tie the drain wire to ground at both ends.
Ground (G)
Transmit (Tx)
Receive (Rx)
Transmit (Tx)
Receive (Rx)
GCT
1
GCT
1
ACT IN/TALLY OUT
+V
+V
Connector
REMOTE
Red
“Show Me” Cable
GCT
1
SW HD 4K Series • Setup Guide (Continued)
2