Yes, that is correct. That is the problem with handling turnaround with a=20
timer. The timer will have to be retriggerable and it will have to have a=20
timeperiod for at least one whole character at the selected baudrate. If th=
e=20
timeperiod is shorter than one character you could risk cutting off some of=
 the=20
characters (the ones that have the last low going edge too long before the =
stop=20
bit(s)). If the timeperiod is too long you could risk missing the beginning=
 of=20
a reply from the other end.

/Ruben


> OK so I might have discovered a design issue.=A0 The 555 timer is trigger=
ed by
> the low going transmit from the TTL side of things, so the output goes hi=
gh
> for the duration of the timer.=A0 If the timer is too short, then your go=
ing to
> miss some of the data...ie....it goes back to the receive mode.=A0 That w=
ould
> make sense why I'm not getting out the correct data when I transmit to th=
e
> RS485 side?
>=20
>=20


=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
Ruben J=F6nsson
AB Liros Electronic
Box 9124
200 39 Malm=F6 Sweden
www.liros.se
Tel +46 40142078
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

--=20
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