Extron • SENTOSA
xi
LQ & LANCIA
xi
LD • User’s Manual
Remote Contact Closure Operation
The RS-232 connector provides a way to control the Sentosa
xi
/
Lancia
xi
using a remote contact closure device. This is made
possible through the use of pins that are not normally used by the
RS-232 interface. The contact closure pin assignments are shown
below
To select a different input
number through the RS-232
connector, momentarily short
the pin for the desired input
number (#) to logic ground (pin
5). To force one of the two inputs
to be selected continuously, leave the short to logic ground in
place, this will override front panel input selection.
The Tally pins can be used for remote indication of the selected
input. Tally #1 or Tally #2 (pins 8 and 9) will indicate the selected
input # with a logic low (0 volts), the Tally pins are normally at
logic high (5 volts).
The schematics shown below may 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 will be required.
+5V (PIN 13)
EXTERNAL POWER
TALLY PIN
RESISTOR VALUE
DEPENDS ON CURRENT
REQUIREMENT OF LAMP
330 Ohm
+5V (PIN 13)
TALLY PIN
LED
330 Ohm
LED Indicator Circuit
N/C
1N916
TALLY PIN
EXTERNAL POWER
+5V (PIN 13)
Using a Relay
& External
Power
Using an
Opto-isolator
& External Power
RECOMMENDED RELAYS
MANUFACTURER
GENERAL
LOW CURRENT
Aromat
ITT/Panasonic
Omron
DS2
R-Z-5C
G5Y
TQ
A5W
G6H
Incandescent Lamp Circuits
H
SOG
H/V
V
RS-232
REMOTE
Pin #
Function
5
Ground
6
Input #1
7
Input #2
8
Tally #1
9
Tally #2
EXTERNAL
+5VDC
EXTERNAL
+5VDC
EXTERNAL
+5VDC
Page 3-5
RS-232/REMOTE Control
im Vertrieb von
CAMBOARD Electronics
www.camboard.de
Tel. 07131 911201
Fax 07131 911203
