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View Full Version : Max distance for serial cable



4Lowie
22-10-2009, 07:57 AM
Morning all... What the maximum length we can send data over a serila cable? I need to remotely control a machine over serial cable, are they good for 10m, 50m..... Your thoughts please.

Speedy Gonzales
22-10-2009, 08:01 AM
A few sites say 50m. How far are these PC's from each other?

CYaBro
22-10-2009, 08:32 AM
A couple of links to check out for you:

http://www.lammertbies.nl/comm/info/RS-232_specs.html

http://www.lantronix.com/device-networking/external-device-servers/mss100.html

4Lowie
22-10-2009, 08:50 AM
Thanks

4Lowie
22-10-2009, 09:04 AM
Now then, as we are only using ground, data tx and data rx can we use somthing like cat 5 cable Or do we need to use fully shielded serial cable??

wratterus
22-10-2009, 09:06 AM
Now then, as we are only using ground, data tx and data rx can we use somthing like cat 5 cable Or do we need to use fully shielded serial cable??

Think you can use cat5...? not sure though.

KiwiME
22-10-2009, 09:22 AM
Traditionally RS-232C has been good for 50 feet, but no doubt it will work further at some loss of reliability. It's a voltage based signal and not balanced so a 3-cond shielded cable is the normal choice. Plus the GND is likely earthed at both ends.

However I would not be surprised if a CAT5 would work if the pairs are connected as such: TX and GND, RX and GND.