Installation manual

7. Description of the InterfaceDiamond digital
117
7.6 TALLY AND GPI INTERFACE
The following supplement contains the specifications of the TALLY and GPI inter-
faces of the mixers DD5, DD10, DD20 and DD30. You find the pin position of the
TALLY and GPI sockets on the terminal panel of the respective mixer in the installa-
tion manual. You will find a circuit diagram of the tally distributor RC1940 as an ap-
pendix to this supplement.
The tally inputs are controlled by connecting the respective input to ground. Control
can be made by a relay contact, a switch or by an open collector out put.
1
5
6
9
Mixer EBox
TALLY IN
GND
External
Example:
Mixer GND
Connection specification TALLY IN (TTL interface):
(absolutely max. )
DC input Voltage V
I
– 2V ... +7V
Input High Voltage V
IH
≥ 2 V or open
Input Low Voltage VIL ≤ 0, 8 V
Input Current High IIH internal pull-up 10kOhm
Input Current Low dyn IIL ≤ 6 mA
Input Current Low stat IIL ≤ 1 mA
Tally inputs