evertz TR-4800E - TR4800-BHP General Purpose Input Connections; Figure 2-13: TR4800-BHP GPI in Wet Mode Circuit Diagram; Figure 2-14: TR4800-BHP GPI in Dry Mode Circuit Diagram

TR-4800E
Tally Router
Page - 20 Revision 1.1
3.9.2 TR4800-BHP General Purpose Input Connections
The rear 32 General Purpose Inputs from the tally router are broken out to 32 terminal blocks across
the bottom of the bulkhead panel. Each GPO has a miniature slide switch below it to select between
Wet and Dry modes (see section 2.7.1). The circuit diagrams for the GPIs in both modes are shown in
Figure 2-13 and Figure 2-14.
GPI +
GPI -
~10 mA
~1.4 V
WET GPI
1
2
optoisolator
Figure 2-13: TR4800-BHP GPI in Wet Mode Circuit Diagram
~10 mA
+WET
DRY GPI
1
2
GPI +
~1.4 V
GPI +
WET-
Figure 2-14: TR4800-BHP GPI in Dry Mode Circuit Diagram