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RS-232
Tx Rx G
Figure 7.
Wiring the Contact/Tally Connectors
To enable input switching via contact closure, connect a push-button contact closure device
to the C (contact) pin of one of the captive screw contact/tally connectors (see figure 3,
F
visible, connect a tally output device, such as an LED, to the T pin of the same contact/tally
connector and a
selected, the corresponding tally pin shorts to ground, activating the connected indicator.
Figure 8.
The contact/tally section of the rear panel contains four captive screw connectors, each
containing two pairs of pins labeled C and T (see figure 8,
pair is labeled with its contact input number (
with its function:
•
•
•
•
To enable input switching via contact closure, connect a contact closure device to a
contact/tally port as follows:
1.
2.
3.
DTP2 T 204 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)
Receive (Rx)
Transmit (Tx)
Remote Connector Pin Assignments
, on page 6). To identify the currently selected input when the front panel LEDs are not
pin to power the device if desired. When the input you are using is
+V
5 5 5
6 6 6
SEND POWER
5
6
C
G
T
+V
C
G
OFF
CONT
REMOTE
1
2
3
4
RS-232
C
T C T
+V
C T C T
Tx
Rx
G
1 1 1
2 2
4
4
4
3 3 3
Contact/tally and Remote RS-232 Ports
C = Contact closure input
T = Tally output
G = Ground (for example,
+V = +V connector for the tally output power wire (for example,
Connect a push-button contact closure device to a C pin of one of the contact/tally
connectors (
,
,
, or
1
3
5
Connect the ground wire of the contact device to one of the G pins.
If desired, to identify the currently selected input when the front panel LEDs are not
visible, connect an indicator device, such as an LED, to tally output pin (T) to the right of
the connected C pin. When the input you are using is selected, the corresponding tally
out pin shorts to ground, which activates the connected indicator.
Transmit (Tx)
Receive (Rx)
Computer or
Control System
RS-232 Port
T
+V
1
through
6
), and each individual pin is labeled
)
4
).
6
DTP2 T 204 Switcher • Installation
). Each C
,
,
, and
1
3
5
6
)
2
T pin
-
13
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