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The center pin and mounting tab (both are the Collector, or output) should have around 12-13v. The left pin (Base, or input) should be 0v in Rx, and between 0v and up to 0.7v in Tx. The right pin (Emitter, or Ground) should be 0v always.

[QUOTE="NZ8N, post: 767938, member: 51368"] The center pin and mounting tab (both are the Collector, or output) should have around 12-13v. The left pin (Base, or input) should be 0v in Rx, and between 0v and up to 0.7v in Tx. The right pin (Emitter, or Ground) should be 0v always. [/QUOTE]

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