Extron Electronics Chapter One - Manual (Page 6)

Lanciaxi xi xi xi xi • Introduction
Introduction, cont’d
Lanciaxi xi xi xi xi • RS-232/Remote Control
• From the Extron Electronics program group, double-click on
the Signal Enhancement Products Help icon.
• From within the Windows-based signal enhancement
program, click on the Help entry on the task bar.
• From within the Windows-based signal enhancement
program, press the F1 key.
Contact Closure Control
The RS-232 connector provides a way to select an input to the
Lanciaxi using a remote contact closure device and indicate the
selected input on the contact closure device. Contact closure
control uses pins on the RS-232/Remote connector that are not
used by the RS-232 interface. The contact closure pin
assignments are shown in the table on page 4-2.
To select a different input number using a contact closure
device, momentarily short the pin for the desired input number
to logic ground (pin 5). To force one of the two inputs to be
always selected, leave the short to logic ground in place. The
short overrides front panel input selections.
The tally pins can be used for remote indication of the selected
input. Tally #1 or tally #2 indicate the selected input number
with a logic low (0 volts). If an input is not selected, the
associated tally pin is at logic high (5 volts).
Figure 8 can be used as a guide to design and build indicator
circuits for the tally pins. Since there is no voltage source on the
RS-232 connector, an external voltage source is required.
Tally pin
LED
330 Ohm
N/C
1N916
Tally pin
External power
External power
LED indicator circuit
Incandescent indicator circuits
Using a relay
and external power
Using an opto-isolator
and external power
+5V (PIN 13)
External
power
External power
Tally pin
Resistor value
depends on the current
requirement of the lamp
330 Ohm
Manufacturer General Low current
Aromat DS2 TQ
ITT/Panasonic R-Z-5C A5W
Omron G5Y G6H
Recommended relays
Figure 8 — Remote indicator circuits
4-7 1-4