I just got a Monoprice matrix switch, which I believe is the exact same as the Vanco Evolution 4x1. [Link: vanco1.com]

I assume the codes are the same and Vanco has them detailed as follows:

Output 1
Input 1A5 5B 02 03 01 00 01 00 00 00 00 00 F9
Input 2A5 5B 02 03 02 00 01 00 00 00 00 00 F8
Input 3A5 5B 02 03 03 00 01 00 00 00 00 00 F7
Input 4A5 5B 02 03 04 00 01 00 00 00 00 00 F6

Audio Switch
Audio AutoA5 5B 03 02 01 00 01 00 00 00 00 00 F9
Stereo Audio2.0A5 5B 03 02 02 00 01 00 00 00 00 00 F8
Dolby/DTS 5.1A5 5B 03 02 03 00 01 00 00 00 00 00 F7
HD Audio 7.1A5 5B 03 02 04 00 01 00 00 00 00 00 F6

Auto Switch
ONA5 5B 02 05 0F 00 00 00 00 00 00 00 EA
OFFA5 5B 02 05 F0 00 00 00 00 00 00 00 09

ARC
ONA5 5B 10 01 0F 00 01 00 00 00 00 00 DF
OFFA5 5B 10 01 F0 00 01 00 00 00 00 00 FE

They also have the pinout for the 3 pole 3.5mm jack as tip TX, ring RX and sleeve ground.

I have a URC MRX8 on the other end, which seems to have a 4 pole 3.5mm jack and says tip is not used, ring 1 is RX, ring 2 is TX and sleeve ground.

Any idea on how to make a cable to get these two working? It's been a while since I've made a 3.5 to db9 adapter and I've never made a male to male 3.5mm with one end 3 pole and the other 4.

Any ideas? Seems like I had them talking at one point, but the commands weren't working.

Help please!

[Link: parts-express.com]

[Link: urcfaq.knowledgeowl.com]

[Link: newark.com]

Get a bag of these on Amazon. So have a three terminal plug on one side, a four terminal plug on the other end, and wire correctly (gnd-gnd, Tx-Rx, Rx-Tx)

I actually already bought some of these. Any idea on how the 3 pole receiver sees the 4 pole connector, aka if pinout for the 3 pole 3.5mm jack is tip TX, ring RX and sleeve ground, which pins are what with a 4 pole connector? I assume it sees tip and sleeve the same, but how does it see 2 and 3? Is 2 really 2?

Does my question make sense?

The base is ground. The middle and tip can be either. Trial by error might be easiest.

Nice and amazing post this one is, thanks for sharing…