Lectrosonics DMTH4 User Manual download pdf (Page 8)

DMTH4

LECTROSONICS, INC.

LED is on when the programmable output is active

380 Ohms

Programmable Output Pin

380 Ohms

LED is off when the programmable output is active

Programmable Output Pin

Gnd (from Programmable I/O

Pins 1, 8, 13)

1N4001

or equiv.

External

DC Voltage

Source

(<40VDC)

Relay Coil

Coil current <100mA

Programmable Output Pin

Gnd (from Programmable I/O

Pins 1, 8, 13)

Relay is on when the programmable output is active

+5VDC (from Programmable I/O

Pins 14, 20, 25)

+5VDC (from Programmable I/O

Pins 14, 20, 25)

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

Input RP Gain Control or Analog Output RP Gain

Control on the Programmable Inputs control tab in

the Control Panel GUI. See the Rear Panel Ctrl tab in

the Control Panel software Help for setting all program-

mable input parameters.

Programmable Outputs

Programmable outputs are used to indicate the current

state of a programmable input, monitor activity on tele-

phone or codec interfaces, and 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 volt-

age for the programmable outputs is 40 V and they will

safely conduct up to 100 mA DC continuous. Following

are some typical uses for the programmable outputs.

Audio Outputs (AUX and CODEC)

The AUX and Codec outputs are a balanced differential

conﬁguration and include an attenuator to reduce the

signal to mic level. Wire these outputs as indicated in

the following illustration.

Telephone Line Jack

Connect a standard telephone cable with RJ11 connec-

tors between the back panel Telephone Line Jack and

the host telephone system.

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

programmable input pins. (See also Programmable

Inputs and Outputs Wiring Example.)

No external pull-up resistors are necessary because

each programmable input is internally pulled up through

a 100K resistor to +5V. When using a continuous volt-

age with one of the programmable inputs, the function

of the programmable input must be set to either Analog

DM Out

Destination

DM Out to Balanced Input

(3-Wire)

Shield

DM Out

Destination

DM Out to Unbalanced Input

(3-Wire)

Shield

DM Out

Destination

DM Out to Unbalanced Input

(2-Wire)

Shield

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Lectrosonics DMTH4 User Manual Page 8

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