I am using about 5 meter cable at speed bauds and RS communication, is it too long? That being said, with decent cable it is easily possible to go longer in tested or non-commercial use, but I would stick to the guidelines for a commercial product, if only to leave an out for support calls.
In your case, 5m really shouldn't be a problem at Almost any shielded multi-conductor cable should work at that distance, and probably three times it. When I was young I railed against non-spec RS hardware, as it made it difficult to reach the maximum distances RS could reach. After all if your driving voltage is 9 V instead of 12 V you lost about a third of your distance right there.
I also griped about other perceived shortcomings in the protocol. RS is an interface protocol. It is not designed for long lengths; it is designed to connect endpoints to more capable communications equipment. RS allows you to connect to a modem that is not on your desk, but the one next to it, even if you have to run the cable high enough that people can walk under it.
You can even cheat and build a passive modem to connect two computers on the same bench out of paperclips use the plastic coated ones, they don't need bubble gum as insulation. My experience is that the lower the baudrate, the longer distance it will work. The company I work for installs rs runs longer than feet using cat5, then just adjusts the baud until it works properly, which could end as low as To figure this out, you could put a loopback on the far end and use the legacy digi xctu tool, which has a range test tab that can do this sort of thing.
However, this may not tell the whole story, as the far end device may have different receive characteristics. I would like to point your attention not only on error rate or transition rate.
In my practice, rs is limited by several meters by problems arising from bad grounding. Voltage between local device ground and rs cable GND may be up to dozen of Volts, which could lead to system malfunction. So, it is worth to consider using differential pair communications like rs or ethernet.
This is for asynch cables, not synch or bi-synch cables. You probably have an asynch cable connection meaning neither side sends a clock signal. UTP cables using this same protocol setup are limited to about half the speed, so maybe 56k. You can make realllllly long serial cables-- if at slow speed and shielded. The speed of light gets in your way at some point. In my experience well installed RS lines over decent telephone and Cat5e cable can go quite a considerable distance.
We have a serial dot matrix printer hooked up to a PC that's nearly m away. Other places that have the same requirements have managed to get 1km. Of course the baud rate is critical, we run it at so no good for high volumes of data but for 20 lines of text on a receipt printer it works just fine, the only issue we have is a poor mains electrical supply to the printer. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
Create a free Team What is Teams? Learn more. Max Serial Cable Length? Ask Question. Asked 6 years, 4 months ago. Active 4 years, 10 months ago. Serial Port RS was first implemented in the 's and is obsolete since long.
It was used to connect mouse, printers, modems etc but had many VGA is a graphics interface which uses RGB analog signals as video output. It's technical name is DE15 connector. The microcontroller tries to output a low to the RS driver. The RS is a communication cable, generally used to transfer and receive the serial data between two devices This cable supports both synchronous and asynchronous data transmissions.
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