Mesa 7i73 wiring question
01 May 2020 09:49 #166295
by rodw
Mesa 7i73 wiring question was created by rodw
If you were using say a Mesa 7i76e, with a PC built into a remote console, would it be possible to run the smart serial RS422 on the unused pairs on the ethernet cable from the 7i76e and split them out at the PC side to a 7i73 powered from 5 volts stolen from a USB port?
It means there is no GND signal.
It would be a real neat trick if it could be done.
It means there is no GND signal.
It would be a real neat trick if it could be done.
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- tommylight
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01 May 2020 10:14 - 01 May 2020 10:15 #166298
by tommylight
Replied by tommylight on topic Mesa 7i73 wiring question
Ethernet uses 4 wires, Mesa 7i73 need 6 for power, gnd, two TX and two RX.
Only 8 wires in the CAT5 or 6.
But you could power it from another source and use the shielding fro GND.
Only 8 wires in the CAT5 or 6.
But you could power it from another source and use the shielding fro GND.
Last edit: 01 May 2020 10:15 by tommylight. Reason: info
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01 May 2020 10:25 #166299
by rodw
Replied by rodw on topic Mesa 7i73 wiring question
Yeh, you should be able to steal power from USB. So just use the shield for GND then?
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01 May 2020 10:58 - 01 May 2020 10:59 #166301
by tommylight
And use the same pair for Tx and the other pair for RX.
Replied by tommylight on topic Mesa 7i73 wiring question
Yes.Yeh, you should be able to steal power from USB. So just use the shield for GND then?
And use the same pair for Tx and the other pair for RX.
Last edit: 01 May 2020 10:59 by tommylight. Reason: info
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01 May 2020 14:01 #166319
by Mike_Eitel
Replied by Mike_Eitel on topic Mesa 7i73 wiring question
Be very carefull. I had a f.. problem getting a high voltage/current short circit over the 7i73 gnd down in the 7i76e... grilling both of them.
Floating grounds is never good. Connect with hem at least via resistor, paralleled by low inductive capacitor.
Floating grounds is never good. Connect with hem at least via resistor, paralleled by low inductive capacitor.
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