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Why won't my HelixNet interface pass audio when using a TW12B or TW12C?

Why won't my HelixNet interface pass audio when using a TW12B or TW12C?

Apr 06, 2019

Neither the HelixNet 2-wire (HLI-2W2) module or the TW12 provide power to a 2-wire analogue partyline circuit. 
It is required to put 30 VDC back on pin-2 plus a termination circuit across pins 1 & 3.  
A PL power supply will supply both of these.  A PK-7 would be suitable for this. 

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