GPIB data errors

[Ancient_Hacker]

Hi, I'm trying to get data from a GOODWILL PPT-3615 power supply.

I can send it commands okay, and it responds, but always with missing
or duplicate characters.

For instance if I ask for its identification info with *IDN? I get:

GOOODWILL PPT33615
GODWIILPPTT36615

and so on.

The GPIB cable is only one foot long.

The card works fine with a HP 3478 meter.

Any ideas?

Thanks,

 

[Sjouke Burry]

N Cook wrote:

Ancient_Hacker <grg2@comcast.net> wrote in message
news:90f5d0b2-5857-47bb-a5ab-e37a9d3b9787@25g2000hsx.googlegroups.com...
Hi, I'm trying to get data from a GOODWILL PPT-3615 power supply.

I can send it commands okay, and it responds, but always with missing
or duplicate characters.

For instance if I ask for its identification info with *IDN? I get:

GOOODWILL PPT33615
GODWIILPPTT36615

and so on.

The GPIB cable is only one foot long.

The card works fine with a HP 3478 meter.

Any ideas?

Thanks,




Baud rate slipped due to dodgey DIP switch ?


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/




Or maybe the new computer is to fast for the GPIB??

 

[Ancient_Hacker]

,

Baud rate slipped due to dodgey DIP switch ?

GPIB has many faults, but baud rate mismatch is not one of them. It's
a parallel data with a complex handshake kind of protocol.

There may be a timing problem with the GPIB master card I'm using.
Gotta get out the logic analyzer to figure it out.
Almost easier to buy a better card....