Electronics > Projects, Designs, and Technical Stuff
Is there any RS232 transceiver with 10mbps datarate?
David Hess:
--- Quote from: SiliconWizard on March 26, 2020, 05:04:34 pm ---Unless you absolutely can't use some simple twisted pair cable for this, I see no reason not to use RS-485 transceivers anyway. Problem solved for a couple bucks.
--- End quote ---
If you can use twisted pair cable, then you can also use singled ended signalling. There *are* 10 Mbit/sec and probably higher standards which use single ended signaling like 10-base2.
So what would a practical implementation look like? Assuming a 100 ohm twisted pair (you are going to need a transmission line for this but it will also work for normal RS-232), I would series or shunt terminate the transmitter side and drive it to +/-5 volts on the receiver side. (1) The receiver side then has no termination but also sees no reflection, or rather all it sees is the reflection but that reflection is the full +/-5 volts. Now the cable capacitance which normally limits RS-232 data rate is irrelevant.
But I know of no suitable integrated drives which do that. I have build discrete drivers before which could.
(1) This means that the series termination requires a +/- 5 volt driver with a peak current of +/- 100 milliamps (actually +/- 50 milliamps) and the shunt termination requires a +/-50 milliamp driver with a voltage compliance of +/- 5 volts. Now you know why RS-485/RS-422 used such low voltages.
jbb:
What equipment have you got that has 10MBit RS232? Maybe you could copy that...
If you’re making new equipment and want it to feel like RS232, I have found RS422 very good in the past. (RS485 is great, but it’s half duplex and needs different communication software.) It will need twisted pair cables and termination resistors, but that’s not too hard.
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