What polarity do I need for my 2-pin Lemo cable?

The polarity of a 2-pin Lemo connector (Lemo Part # FGG.0B.302.CLAZ) is referred to by Media Blackout in these two ways:

  • Pin-1 GND - This means that the pin next to the red dot is the ground, or negative connection
  • Pin-1 +VDC - This means that the pin next to the red dot is the positive voltage connection

Pin-1 GND (also called: ground, common, return, or negative voltage) is the most common polarity, and it is sometimes referred to as Arri polarity because Arri popularized this wiring scheme.

Pin-1 +VDC (positive voltage) was more common during the analog era in the US, and some companies still use this wiring scheme.

Some devices are polarity agnostic, meaning they can take either polarity cable. Some polarity agnostic devices are as follows: Media Blackout's BreakerBatt and BreakerBox, Zacuto's Gratical Eye, and PLC Electronic's 2-channel Bartech Digital Receiver.

Here is a list of common brands and their standard 2-pin Lemo polarity:

Pin-1 GND

  • Arri
  • Red
  • Offhollywood
  • Panasonic
  • Paralinx
  • Teradek
  • Preston
  • Switronix
  • Transvideo
 


Pin-1 +VDC

  • Bartech
  • Artemis
  • Stanton
  • Hedén
  • Letus
  • Redrock
  • Steadicam
  • Hocus Products
 

There are also two ways of referring to the wiring of cables that have 2-pin Lemo connectors on both sides:

  • 1:1 - Cable is wired 1:1, or pin-1 to pin-1 & pin-2 to pin-2; This means that the connectors are wired to pass the same polarity that is fed into it. It doesn't matter which end of the cable is plugged into the power source or device because the wiring is symmetrical.
  • Crossover - Cable is wired 1:2, or pin-1 to pin-2 & pin-2 to pin-1; This means that the connectors are wired to change the polarity that is fed into it. It doesn't matter which end of the cable is plugged into the power source or device because the wiring is symmetrical.
2-pin_polarity_tester_-_1.png Need help identifying the polarity of your 2-pin Lemo cable? Our 2-pin Lemo Polarity Tester does just that: https://mediablackout.net/products/2-pin-lemo-polarity-tester
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