RS232 is -13 to +13V. Its NOT TTL signal
2013/12/31 William Hermans <[email protected]> > What kind of sensors are these ? I am not exactly a hardware guy either, > but rs232 if i recall correctly is serial. Whether or not this type of > serial is compatible with the onboard UART serial . . . I am not sure. I am > thinking that rs232 is 5v ttl where the uarts on the BBB are 3v3. Which > would mean at minimum you'd need voltage level translation . . . > > The point here would be perhaps a different interface type could be chosen > if these two types of serial are not directly compatible. And still be > cheaper. > > Anyway as stated at the start I am not exactly a hardware guy, so I could > very well be wrong. > > > On Mon, Dec 30, 2013 at 11:10 AM, Bruce Bowler <[email protected]>wrote: > >> Hi, I'm a newb to the whole beagle/pi/arduino world, but from what I've >> seen, beagle appears to have the best 'support system' so I'm going to >> start here. I'm also not a 'hardware guy'. >> >> I've been asked to design what is basically a data collection system, that >> will have between 4 and 6 instruments connected to it. All of them are >> 'off the shelf' sensors that have, as their only means of interface, >> rs232/ >> db9 connectors (yes, I could change the db9's to something else :-) >> >> In poking around it seems that the best way to get those inputs into the >> system is with a 4 or 8 port USB hub. Is that a correct assumption on my >> part or is there a way to get ports "directly" onto the system with some >> sort of multi-port cape? If the answer is "you can do 4 but not 6", I >> could probably live with that, as physical mounting space is somewhat >> limited where all this has to go. >> >> Thanks! >> Bruce >> >> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> For more options, visit https://groups.google.com/groups/opt_out. >> > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/groups/opt_out. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
