Unclear usage of TerminationCharacterEnabled in VisaNS.

[fransv1963]

I'm a bit confused with respect to TerminationCharacterEnabled and TerminationCharacter (MessageBasedSession).

I guess the same holds for the C equivalents (VI_ATTR_TERMCHAR_EN and VI_ATTR_TERMCHAR).

Are these only used during VISA read operations ?

I have an older type of instrument (HP4142) which expects either CR/LF or LF as terminating character before it starts processing commands.

The support for EOI is not clearly explained in the manual and referred to as CR/LF^EOI .

Some tests learn that indeed using EOI only is not enough.

As such sending "*IDN?" without trailing '\n' doesn't work for this instrument because it's waiting for remaining commands.

Sending "*IDN?\n" does work.

Because it works with TerminationCharacterEnabled = false, it means that the HP4142 uses the EOI line to indicate that it has finished sending data.

Again this is poorly explained in the 4142 manual as CR/LF^EOI .

Then I tried sending "*IDN?" without trailing '\n' once more after setting TerminationCharacterEnabled = true and TerminationCharacter = 0x0A.

I hoped that VISA would then add a trailing '\n' to my command.

It didn't work.  As such I tend to believe that indeed TerminationCharacterEnabled and TerminationCharacter are only used during read operations.

Anyone out there to confirm the above or to disagree ?

This brings me to a 2nd question.

What is the equivalent of CR/LF on a Windows machine ?

Is it 0x0A or 0x0D0A ?

If it is the latter, how can it be specified as TerminationCharacter, which expects one byte ?

My understanding is that 0x0A corresponds to CR/LF on a Windows machine, while 0x0D0A is required on a Linux/Unix machine. Correct ?

Thanks.

Frans.