Audio And Logic Connection - Pacific Research BMX-III-18 Operation And Technical Manual

2.7 AUDIO AND LOGIC CONNECTION

Good wiring practice calls for care in making each connection and in neatness of cable layout. Complete
information relative to console input, output and logic terminations is contained in the connection
reference drawings included in this section.
A standard connection theme is used throughout all PR&E consoles and mixers - the use of 3, 6 and 12
pin Molex connectors for audio wiring. The standard pin-out sequence is as follows:
Pin #1
Pin #2
Pin #3
Pin #4
Pin #5
Pin #6
Pin #7
Pin #8
Pin #9
Pin #10
Pin #11
Pin #12
This system of pin assignments takes advantage of the three pin per row design of the Molex connectors.
As viewed from the rear of the console, the shields are always connected to the left pins, the low wires
(black) to the center pins and the high wires (red) to the right pins. While this inspection will not indicate
if a connector is in the correct position, it will verify proper shield and polarity connection.
Each BMX III input module offers a comprehensive set of logic functions, as outlined in Section 2.8.
These functions are brought out from each input module position to a pair of 15-pin Molex connectors
labeled LOGIC-A and LOGIC-B, and are designed to drive interface relays and/or opto-isolators to
control auxiliary equipment.
Fabrication of interface systems is straightforward. However, should the installer prefer to use
prefabricated units, interface devices and cable assemblies are available from PR&E to control most
professional grade tape decks, cartridge machines and turntables. Information on these interfaces is
provided in Chapter 8.
NOTE: The control commands and functions are referenced to the console logic power supply and,
as such, should never be directly connected to auxiliary equipment control logic supplies and/or
grounds.
The BMX III uses "common" or "ground" switching for all of its control inputs, thus preventing the
possibility of defective remote controls shorting out the logic power supply.
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Shield of monaural or left channel signal pair.
Low of monaural or left channel signal pair.
High of monaural or left channel signal pair.
Shield of right channel signal pair.
Low of right channel signal pair.
High of right channel signal pair.
Shield of left channel signal pair.
Low of left channel signal pair.
High of left channel signal pair.
Shield of right channel signal pair.
Low of right channel signal pair.
High of right channel signal pair.
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BMX SERIES III CONSOLE
REVISION C