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I am looking for Speaker craft 3.5mm (4conductor) to DB9 serial cable to program MZC 64 through EZ tools. I am unable to find it online. Does anyone have the cable or know the contact points from 3.5mm to DB9 serial cable for making the cable?

Thanks

HPal
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1 Answers1

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The common layout for the TRS serial cables that I've seen are:

  • Tip - Receive
  • Ring - Transmit
  • Sleeve - Ground
 _
\_/  <- Rx
| |  <- Tx
|_|
| |  <- Ground
|_|

If you have a TRRS connection, typically the sleve and the lower ring are both ground.

However there's no guarantee this is going to be correct for your specific device (I've no idea what a MZC 64 is). Good news is that you're unlikely to mess anything up seriously, so some trial and error might be the way to go.

I would also suggest asking over on our electrical engineering site. It may not be as simple as just wiring it straight up, there might be TTL logic or level shifting or something else required that's baked into the OEM cable.

Mark Henderson
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  • MZC 64 is a Speakercraft made multizone Audio/video amplifier controller. And the cable I am looking for is used for firmware upgrade in MZC 64 and also for programming the MZC 64 for different zones. From the information I have gathered, it is 3.5mm quad plug to DB9 serial adapter. – HPal Sep 20 '19 at 04:10
  • As an owner of an MZC-66, I can confirm that the tip is Rx, Upper ring Tx, Lower ring and sleeve are ground. There are usb->3.5mm cables on aliexpress that have this config – EionRobb May 31 '20 at 10:12