Lectrosonics SPNTWB User Manual download pdf (Page 9)

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.

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

Power Amp Outputs

Each output can drive a

variety of loads, including

loudspeakers, long cable

runs and headphones.

The BTL (bridge tied load)

conﬁguration allows the

two channels to be wired

in parallel on a common

load to double the output

power.

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Lectrosonics SPNTWB User Manual Page 9

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