12 Jun
2012
12 Jun
'12
1:08 a.m.
On 06/11/2012 03:37 PM, Tony Duell wrote:
Yes! That's exactly what I do, but I don't recommend it anymore
because the response is usually "I don't have one of those things with
LEDs and they're so EXXPEEENNSSIIVEE!!" (they're like ten
bucks...cheapasses) But yes, that works perfectly. Something needs to
be driving TxD, and something needs to be driving RxD. Which is which,
and what state they're in, is unimportant if the goal is to get it talking.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA
On 06/09/2012 10:23 AM, Kevin Reynolds wrote:
No, I won't, and you won't blow a (real) fuse, or an IC, or anythjing if
you try it. One good thign abotu RS232 is that it is designed to
withstand having signals shorted or mis-connected.
I'm trying to figure out which adapter I
should get to attach my wyse 60 to the console of a microvax III (3900).
I know I need a MMJ jack to DB25 male cable, but there are a few flavors. At first
glance it appears that I either need H8571-D or H8575-D, however its possible I ned
H8575-E.
Someone know which one to purchase? I have the BC16E cable required...
There are lots of flavors. Though Tony will probably blow a fuse when
reading this suggestion, figuring out the absolute perfectly correct one is a complete waste of time...Get an MMJ adapter,
whichever one you can
find. Plug it in. If it doesn't talk, insert a null modem, and it will
talk. Simple as that.
I wouldn't quite do that. I'd grab one of thos little DB25-DB25 adapters
with LEDs to monitor the most important signals. Plug that into the
dapater first (with the adaptor conencted to the (powered-up) Microvax)
and see which line (2 or 3) it's transmitting on. One will be driven, the
otehr won't be. Then if it's driving pin 2, you need a null-modem.
I have solved many RS232 problems with little more than that.