How remote/local mode for GPIB instruments works?

[mini]

Remote/local mode for GPIB instruments is being controlled by REN one of five interface management lines. That's the only information available on this subject. Where can I find some more detailed explanation? I still don't know what conditions have to be met to put device in remote/local mode.

[Kim L]

REM indicates whether or not the board is in the remote state. REM is set whenever the Remote Enable (REN) GPIB line is asserted and the GPIB board detects that its listen address has been sent either by the GPIB board or by another Controller. REM is cleared whenever REN becomes unasserted, or when the GPIB board as a Listener detects the Go to Local (GTL) command has been sent either by the GPIB board or by another controller, or when the ibloc function is called while the LOK bit is cleared in the status word.
A call to the function ibonl clears the following bits:
END LOK REM CIC TACS LACS DTAS DCAS

You can find more information in the NI-488.2M Software Reference Manual (see link below).
http://digital.ni.com/manuals.nsf/web_productcurrent/43AB49D953CE104E8625665E0
07D11FF?OpenDocument

All of our manuals are available online at the following site.
http://www.ni.com/manuals/

Thanks,
Kim L.
Applications Engineer
National Instruments