On 01/01/2016 05:16 PM, Peter C. Wallace wrote: >> The bandwidth of rs232 style serial connections is so low that you will >> not see any problems with twisted pairs. I assume that you are not >> connecting half a kilometer of cable with a speed higher than 115k2 baud >> (or you may run into capacitive loading problens). >> >> Pairing TX and RX with a GND may actually improve noise immunity. But >> the cable is already well shielded. > > SSerial is differential RS-422 at 2.5 MBits/sec and requires ~100 Ohm > differential cable cable impedance. This usually means twisted pairs > are required for TX and RX (the 5V/GND power connections are not critical)
Then the cable should be just fine. Each differential pair takes a twisted pair. Most Ethernet cabling has a characteristic impedance of about 115 Ohm. The crux is then to have appropriate drivers and correct impedance matching (termination) at the end of the cable pairs. -- Greetings Bertho (disclaimers are disclaimed) ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
