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This is what I figured the answer was, however if that's the case, then how come the device in the video works? The barcode scanner shown isn't a RS232 source natively, rather it's a USB device which is converted to RS232 via the product featured. To put it another way: what is the difference between the barcode scanner and say a microphone that would allow the barcode scanner to work with this device but not the microphone?
– user1251367
Commented Dec 14, 2020 at 20:39
1

The only possible way is if its firmware emulates two microphones and takes care of the handshake with both computers, then sends the barcode data to both. This is why this device is sitting in a box rather than being a simple splitter with two wires. I don't think such a device exists for microphones, or at least didn't find one on Amazon.
– harrymc
Commented Dec 14, 2020 at 20:48
Workarounds: one mike to multiple PC's - have first PC relay signal to second, e.g. UDP broadcast, or use audio splitter. Two PC's to one DAC - 3.5 mm audio (or two bluetooth connections) to an audio mixer.
– DrMoishe Pippik
Commented Dec 14, 2020 at 21:44
harrymc - Makes sense this would be at a firmware level, probably register it as a generic HID device since it can also work with a keyboard according to the product page, which likely wouldn't work with something like a mic. DrMoishe Pippik - I've though of similar workarounds, will probably do a network relay for the mic example. For the many PCs to speakers example, another workaround could actually be each PC having its own DAC, then using splitters to merge the analog RCA signals coming out of the two DACs before they merge go into a single amp, need to think about it more. Thanks!
– user1251367
Commented Dec 14, 2020 at 22:18

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