Crestron electronic DMTH4 Audio Outputs AUX and Codec, Telephone Line Jack, Programmable Inputs

DMTH4

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.

DM Out Destination

+	+
-	Shield -

DM Out to Balanced Input

(3-Wire)

Potentiometer Connection for

Analog Control of Gain

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

DM Out

+

-

Shield

Destination

+

To Programmable Input Pin

0VDC (Off) to +5VDC (On)

Gnd

Output RP Gain Control on the Programmable Inputs control tab in the Control Panel GUI. See the

DM Out to Unbalanced Input

(3-Wire)

DM Out	Destination
+	+
-	Shield

DM Out to Unbalanced Input

(2-Wire)

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

Rear Panel Ctrl tab in the Control Panel software Help for setting all programmable input parameters.

Programmable Outputs

Programmable outputs are used to indicate the current state of a programmable input, monitor activity on telephone 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 voltage for the programmable outputs is 40 V and they will safely conduct up to 100 mA DC continu- ous. Following are some typical uses for the program- mable outputs.

LED is on when the programmable output is active

+5VDC (from Programmable I/O
Pins 14, 20, 25)	380 Ohms
Programmable Output Pin

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. (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 voltage with one of the programmable inputs, the function of the programmable input must be set to either Analog Input RP Gain Control or Analog

LED is off when the programmable output is active

+5VDC (from Programmable I/O
Pins 14, 20, 25)	380 Ohms
Programmable Output Pin
Gnd (from Programmable I/O
Pins 1, 8, 13)

Relay is on when the programmable output is active

Relay Coil	1N4001
Coil current <100mA	or equiv.

Programmable Output Pin

Gnd (from Programmable I/O

Pins 1, 8, 13)

External DC Voltage Source (<40VDC)

8 LECTROSONICS, INC.