Owner`s manual

M O N O M I C I N P U T

page 2 – 7

RD-12 / March 99

Talkback to Control Room

If an MMD-5 module is being used for a studio microphone, these

ports allow talkback from that studio to the console operator. Provide

a closure between Pin 11(D) (TB MIC A to CR) or Pin 11(C) (TB MIC

B to CR) and Digital Ground (Pins 5, 6 of C and D). This will cause two

things to happen: (1) the module’s pre fader signal is sent to the

console’s Cue bus, where it may be heard by the console operator, and

(2) the module’s Cough function is activated, muting the module’s post

fader signal and preventing the TB signal from going out over other

assigned busses (i.e., “live”). This non-latching condition continues

until the closure is released. (Requires user-supplied momentary action

TALKBACK switch at the studio microphone location.)

On Tally

Lets the module’s channel ON switch control an on-air light or other

“microphone on” indicator at a remote location. This control function

provides a continuous closure between Pin 9(D) (On Tally A) or Pin

9(C) (On Tally B) and Digital Ground (Pins 5, 6 of C and D) whenever

the module’s channel ON switch is activated. These are open collector

outputs.

This closure can be used to control an externally powered tally light

that requires a continuous closure to function. Or an external tally light

(i.e., LED) can be powered from the input module by connecting the

external LED to +5V Digital (Pins 4 of C and D) and the A or B On Tally

ports. In either case, current should not exceed 30 milliamps.

Off Tally

Identical to “On Tally” (preceding) only this function keys off the

module’s channel OFF switch. Off Tally A is Pin 10(D); Off Tally B

is Pin 10(C).

We recommend a series

resistor between the LED

and +5V digital when you

are powering the external

tally from the console; a

value of 220Ω (1/4W 5%)

is suggested.