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Author Topic: CP750 automation connector question David Buckley Jedi Master Film Handler Posts: 525 From: Oxford, N. Canterbury, New Zealand Registered: Aug 2004 posted 06-14-2016 04:00 AM                        Does anyone have any additional documentation or knowledge on the CP750 automation outputs on the DB25 connector? The manual says pins 14 to 20 are tally LED outputs, but gives no real details. It further says that pin 13 is automation power, +5V at 50mA, and that pin 12 is common return for everything including power, so it must be a -ve. So my guess is that the tally outputs are intended to each drive a tally LED, and thus are 5V switched +ve feeds with about 20mA drive capability...?  |  IP: Logged Nguyen Jack Film Handler Posts: 93 From: Singapore Registered: Mar 2013 posted 06-15-2016 01:35 AM                     Hi, You can see it on page 67 & 68 of the document Dolby_CP750_Installation_Manual_v5.pdf  |  IP: Logged Carsten Kurz Film God Posts: 4340 From: Cologne, NRW, Germany Registered: Aug 2009 posted 06-15-2016 03:25 AM                     David - I have never seen a full electrical documentation on Dolbys automation connectors. Maybe there is a separate tech bulletin or something. You can dig up the DT6D manual from the warehouse and have a look at the DTS6D - Dolby interconnect schematics at the rear end of these docs to get an idea how inputs and outputs can be used, e.g. the DTS6D-CP65 or DTS6D-CP500 schematic. - Carsten  |  IP: Logged Dave Macaulay Film God Posts: 2321 From: Toronto, Canada Registered: Apr 2001 posted 06-15-2016 08:46 AM                     The v5 manual lists what the tally pins report. As to polarity - pretty easy to test with a meter and maybe a resistor. The tally pins will either give you a current source for a load to ground, or a ground sink for a load to the pin 15 +5V power. You could try Dolby support if you don't want to experiment.  |  IP: Logged

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