Lectrosonics SPN32i - Manual (Page 9)

Installation and Startup Guide
Rio Rancho, NM 9
Programmable Inputs
Programmable inputs are provided to enable external
control over a variety of parameters. Each input can
respond to a contact closure, a DC voltage source, or
the variable voltage output from a potentiometer. The
following illustrates common connections to the pro-
grammable input pins.
10K Linear Potentiometer
CCW CW
+5V
To Programmable Input Pin
Gnd
Contact Closure as Programmable Input
To Programmable Input Pin
Gnd
DC Voltage Source as Programmable Input
To Programmable Input Pin
0VDC (Off) to +5VDC (On)
Gnd
Potentiometer Connection for
Analog Control of Gain
Programmable
Inputs
Programmable
Outputs
Ground
+5VDC
Programmable Outputs
Programmable outputs are used for several purposes:
• indicate the current state of a programmable input
• monitor activity on telephone or codec interfaces
• monitor active preset changes
Each programmable output is the electrical equivalent
of a contact closure to ground. When a programmable
output is “active,” it conducts current to ground. When
the programmable output is “inactive,” no current flows
to ground. The maximum usable voltage for the pro-
grammable outputs is 40 V and they will safely conduct
up to 100 mA DC continuous.
Both LEDs and 5V relay coils can be powered by the
+5 V DC pins on the programmable input connector, as
long as the maximum combined current for all LEDS
and relay coils does not exceed 100 mA.
380 Ohms
Pro gr amma b le Output Pi n
380 Ohms
Programmable Output Pin
1N4001
or equi v . Exte r na l
DC V oltag e
Source
(<40VDC) Rel a y Coi l
Coil current <100mA
Pro gr amma b le Output Pi n
Relay is on when the programmable output is active
+5VDC
+5VDC
GND
LED is ON when the programmable output is active
GND
LED is OFF when the programmable output is active
Note: The diagram above shows an external DC source pow-
ering the relay coil. This is necessary whenever coil voltages
exceed 5 volts.
LED
380 TO
500 OHM
10K
LINEAR
POT
CW CCW
IN 1
IN 3 ON
OFF
LOGIC OUTPUTS
GROUND
5VDC
LOGIC INPUTS
LOGIC
OUT 7
LOGIC IN 3
ANODE CATHODE
Anode Cathode
V
R
Anode
Cathode