🚀 go-pugleaf

On Fri, 08 Feb 2002 14:20:01 GMT, DeductThisPart.gpsnav@pacific.net.sg
(Tom Werry) wrote:

>budgie <budgie@nowhere.cantech.net.au> wrote:
>
>>This request is for info to assist in the above.  I'm not after
>>general "how-to" stuff, rather I'd like to get some clues from someone
>>who has "been there".
>
>>I have a HP34970A on loan, c/w all manuals.  Normally I'm quite
>>capable of writing Basic code for RS232 comms for pretty much
>>anything, but this one has me stumped.  I've read the user manual for
>>far too long - all aussie support have gone for the weekend :-(
>
>>All the commands to the instrument seem to be accepted OK, but all
>>attempts to actually receive any data from it are met with a "hang" on
>>the input statement.  DOS platform, QBasic and/or QB4.5 in use ('cos
>>VB-DOS and serial comms don't get along).
>
>>Anyone been there?  All help appreciated.
>
>Peter,
>
>Post/email a bit of your code, specifically the open comms stmt and
>the input for comms.


Will do - it's on another box elsewhere.  Probably in about 20 hours
from now I can post some of it ...

>Are you using the LOC (n) function to see if there is anything at the
>port?  If yes send that code as well.

Not at this stage.  I have just got an INPUT# sitting waiting.  Once
the HP actually sends some strings I will look further at how I will
best absorb them into QB(asic).

>You may not have the right open options set and then your device
>doesn't set the correct control lines to be compatible with Basic's
>port settings - RTS, CTS, DTR, DSR, CD, etc. - that kind of stuff.

Tried RTS/CTS intially at both ends - no difference to now, when i
have moved to XON/XOFF (HP's preferred mode).

>How many wires do you have connected end to end - 3? 5? 7? What?

It's the supplied HP lead.  The HP is a DTE (also), so it is a null
modem config with (IIRC) all leads employed.

>Do your DB9/DB25 plugs have anything shorted to loop back?

No, all end-to-end with crossovers.  When I next grab the book I can
give you the pinouts, but I can't see that being the problem.  No
breaks - checked that first.

>Are the port parameters set right in the HP device?

Yes.  9600-8N1 both ends.

>Do you have one of those blinkie-lights thingees that you can use to
>verify that the HP device is actually wanting to send data?

Yes, and it isn't sending a cracker.  That's the problem - all the
SCPI commands I saw  resulted in data in the HP output port, but I
couldn't find an SCPI command to force it to actually Tx any data ..

>Can you verify that your cable does not have an open/shorted solder
>connection somewhere in one or more of the pins on one of the
>connectors?  (Meter?)

Done.

>Have you been a bad boy or forgotten to say your prayers or something?
>

Ahah!!  That could be it ;-)

>If you are sending an email, send the whole effing program because
>it's probly fairly short - I can just fix it for you if there's
>something wrong.

You speak SCPI?


Tnx Tom

Peter