I've never had my 302 on an oscilloscope before to measure its outputs but I want to call out that a compliant RS232 standard device could have up to +/- 25 volts on its logic pins. Typical PC applications are in the +/- 5 to 13v range and I would guess the 302 will likely output around +/-5v. Therefore, if you directly stuff an RS232 line from the 302 into a USB device that expects 3.3v you run a risk of destroying the equipment. It may work forever. It may work intermittently. It may never work.

I've no idea what type of wiring examples Craig is sharing but if it doesn't include some sort of RS232 to TTL line level conversion I would run, not walk away.

RS

On Tuesday, January 7, 2020 at 2:47:56 PM UTC-6, Craig Funston wrote:
On Tuesday, January 7, 2020 at 8:13:47 AM UTC-8, wrote:
Does anyone have the pin-out diagram / specifications for the AVier navigation display unit? It's an old unit, and I'm looking for a suitable display for my Cambridge 302A data logger. A fellow club member gave me an AVier display to evaluate, but none of the cables provided with the AVier unit have a correct interface with the 302A, so I'm trying to manufacture an appropriate cable for this interface. The 302A data output is a 9-pin connector, and the AVier appears to be a mini-USB input connector. Thanks in advance for your help!

Boomer
Uber Fluggen (N16UF)

Boomer,

PM me at my gmail address. I have pinouts and wiring examples.

nimbus3mail
Craig