On Thu, 28 Oct 2010, tom campbell wrote:
> Joe:
>
> can't say for the TS-7800.
> I do it for TS-7260. I'm running a full debian Sarge (not busybox
> ts-linux as supplied by embeddedArm... so your mileage may vary)
I get the impression the guy is using an add on card? He mentions
"PC104/UART configuration"
So to the o.p. : What hardware are you trying to get 485 going on?
It always helps to gives FULL details - 'cos in general we are not mind
readers.
> I forget the details and I don't have time at the moment to dig out my
> all my documentation and post it, but....
>
> basically I think I had to (a) make sure some jumpers were set for
> half/full duplex and setting drive levels to RS-485 instead of RS-232.
>
> (b) seem to remember having to add something to for one of the serial
> ports on the TS-7260. Probably not the case if running embeddedarm
> supplied os on your 7800
>
> (c)there's some memory map bits that you have to poke at to set
> half-duplex/full duplex
>
> > # Say hello
> > echo -n "$PROGRAM_NAME: Changing com2(/dev/ttyAM1) to "
> >
> > declare poke=/usr/local/sbin/poke8
> > declare memloc=0x22c00000
> > if (( $INITIALIZING )) ; then
> > # Switch com2 to RS-485 half-duplex 115Kbaud
> > echo "RS-485, half-duplex, 115200 baud."
> > memval=0x07
> > else
> > # Switch com2 to back to RS-232
> > memval=0x00
> > echo "RS-232."
> > fi
> >
> > # Do it
> > set +e # poke behaves badly, returns 7
> > $poke $memloc $memval
> >
> > # Life is good
> > exit 0
> >
> Once that's done... I use picocom /dev/ttyAM? (My terminal emulator of
> choice) to talk half-duplex just fine. The supplied technologic
> documentation is complete on all this stuff... you sometimes just have
> to dig for it.
>
> tc
>
>
>
>
> On Thu, 2010-10-28 at 17:01 +0000, jtheath4u wrote:
> >
> > Hi All,
> >
> > First post to the group. Also just getting started with Technologic
> > Systems' TS-7800. We're planning to use the board for motor controls.
> >
> > One of the first tasks is to get RS-485 up and running. Documentation
> > is pretty sparse. Need to clear bit 15 in the PC104/UART configuration
> > register. Baud rate is set by 3 bits in uart-associated status
> > register.
> >
> > Do "normal" serial configuration operations work on the RS-485 port?
> > Does one open the device (say /dev/ttts2) and read/write as any other
> > TTY?
> >
> > Any guidance/instruction on 7800 RS-485 port use would be appreciated.
> >
> > Thank you, Joe
> >
> >
> >
> >
> >
>
>
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