Timeline for Method for Sending Multiple (16) Channels of Duty Cycle Modulated Signal over Medium-Long Distance
Current License: CC BY-SA 4.0
7 events
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| Jul 12, 2018 at 23:51 | comment | added | Conor Retra | While I haven’t made the commitment yet, I’m leaning towards the LVD chip solution simply because it is potentially easier to debug. To me, the cost/mess of a few extra runs of CAT cable is well worth the ability to really understand what’s happening within the chip. With a technology that I’m not 100% confident with, I like the idea of being able to slowly move channels of data from the ribbon cable to the CAT cable while observing the changes. If I had worked with the SerDes chips before and knew it would work right away with these panels, I’d certainly choose that. | |
| Jul 12, 2018 at 17:10 | comment | added | Maple | May I ask why you decided against SerDes? It would have made cabling much simpler. Also, I am curious how do you send data to chained panels? The documentation in your link says it is possible but gives no info how, and says library does not support it. | |
| Jul 12, 2018 at 17:05 | comment | added | Maple | Ground should go straight to the cable. It is the same ground that connects to Gnd pins on chips. I suggest using one twisted pair in 3 out of 4 cables for this. You should not treat these as separate grounds, in fact it is better to connect them all together right next to jacks. Another option is to use one of those 3 twisted pairs to supply +5V to the chips on panel side, since there is no power on ribbon cable and it is not advisable to have one chip powered up while the chip on the other side does not have power (if panel supply is not plugged in) | |
| Jul 12, 2018 at 16:26 | comment | added | Conor Retra | Thank you for the thorough answer and the terminology clarification. I've looked into your suggestions, and think your suggestion of the SN65LVDM1677 will work perfectly well. I will design one board that makes switching between TX and RX easy, depending on the side of the link. One question for you: 3 of the 16 channels are ground - should those bypass the chip or should I treat those as logical communication channels (send the signal through the chip) as well? | |
| Jul 10, 2018 at 12:18 | history | edited | Maple | CC BY-SA 4.0 |
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| Jul 10, 2018 at 12:12 | history | edited | Maple | CC BY-SA 4.0 |
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| Jul 10, 2018 at 12:03 | history | answered | Maple | CC BY-SA 4.0 |