How do I get LabView to communicate with HP4142B, using GPIB?

I have a PCI-GPIB card from NI and running Labview 6.1 under Windows 2000.
I have trouble to communicate with a HP4142B.
Every time I send a GPIB-command to the 4142B I get an EABO error. The instrument seems to receive the command
but does not give any answer. There may be some trouble with the EOS character but I don't know how to correct it. Communication with other instuments (i.e. HP34401A) works without this problem together with LabView.
I have also tried to send commands with the NI-488.2 program but the EABO error remains.
First I thougth that HP4142B has got a HW error but then I sucessfully used a program called "HP VEE".
The instument then worked without any trouble so there must be someth
ing else that is incorrect.
It is important for me to get the HP4142B to work with LabView and the PCI-GPIB card so I hope you can help me solve my problem!
Jon Alfredsson
M.Sc.EE, Ph.D student
Mid Sweden University

Hello John,
This sounds like a classic case of missing termination characters. The termination characters should be specified in the instrument's user manual. HP VEE is probably adding certain termination characters by default. Common termination characters are a carriage return, a linefeed, or both. In LabVIEW you can easily add termination characters to a string by right clicking on it, selecting / codes display, typing in a /r or /n at the end of the string. Alternatively, if you are using the regular 488.2 VIs (not VISA), you can specify different modes on the write commands. Each mode corresponds to the termination methods/characters that will be appended to the command. See the LabVIEW detailed help on the GPIB write VI for more information.
Regards,
Ra
y K
NI Applications Engineer
Ray K
NI Applications Engineer

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