Lectrosonics SPN812 User Manual download pdf (Page 11)

Installation and Startup Guide

Rio Rancho, NM

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

+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.

(see next page)

Audio Outputs

The line outputs are a balanced differential conﬁgura-

tion which can drive balanced or unbalanced inputs on

other audio equipment with the wiring shown here.

Balanced output to a balanced input is a straightforward

“pin to pin” conﬁguration.

Destination

Output

Balanced output to

balanced destination

Shield

Balanced output to unbalanced input with a 3-wire

cable is connected with the cable shield added to the

(–) terminal on the destination input.

Destination

Output

Balanced output to unbalanced

destination – 3-wire cable

Shield

Balanced output to unbalanced input with a 2-wire cable

is connected with the output (–) connected to the cable

shield at the processor output.

Destination

Balanced output to unbalanced

destination – 2-wire cable

Output

Shield

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Lectrosonics SPN812 User Manual Page 11

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