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1 vote

Why does voltage in RS485 bus change significantly when termination resistor is connected?

The first notice is that you are using the MAX485 with 3.3V and it's not intended to be used at 3.3V but 5V so all your findings may be irrelevant due to wrong supply voltage. The chip doesn't even ...
Justme's user avatar
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1 vote

Why does voltage in RS485 bus change significantly when termination resistor is connected?

Some RS485 transceivers come with pull-up resistors so you don't have to add them yourself. Before you added the termination resistor, the pull-up resistors could pull the lines to the supply ...
izmw1cfg's user avatar
1 vote
Accepted

TTL bus termination physical circuit layout

how important [is] the physical location of the [terminators?] All important. Within limits: A transmission line is a useful model when its properties are ...
greybeard's user avatar
  • 1,041
2 votes

Is this a right magnetics termination for PoE and non-PoE application

No. That's not correct. It does not terminate. There is an AC short circuit between center taps. If you compare with Bob Smith, it has impedance between center tap, either DC or AC coupled.
Justme's user avatar
  • 119k
0 votes

Novel CAN bus design - needs criticism

Not an answer, but a formatted comment. You'll also have to deal with addressing. If you are using a CAN, bus contention is resolved based on node address, where the lower the address, the higher the ...
pgvoorhees's user avatar
  • 2,486
2 votes
Accepted

Understanding passive TTL termination

Yes, that seems like a "standard" termination for TTL buses. The 220/330 are very typical values and very often seen. But they are not the only values. Yes, schematics describe the logical ...
Justme's user avatar
  • 119k

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