Measurement-computing GPIB-488 Manual do Utilizador descarregar pdf (Página 41)

Chapter 3 GPIB 488.1 Library Reference

Programming Reference Manual 3-28 GPIB-488

IBLOC

Forces the specified board/device to go to local program mode.

Syntax

C ibloc (int boarddev)

Parameters

boarddev is an integer containing the device or board handle.

Returns

ibsta will contain a 16-bit status word as described in Appendix B, IBSTA.

iberr will contain an error code, if an error occurred.

Usage Notes

This routine is used to place boards or devices temporarily in local mode. If this routine

specifies a device, the following GPIB commands are sent:

• Talk address of the access board

• Secondary address of the access board

• Unlisten (UNL)

• Listen address of the device

• Secondary address of the device (as necessary)

• Go to Local (GTL)

If this routine specifies a board, the board is placed in a local state by sending the Return to

Local (RTL) message, if it is not locked in remote mode. The LOK bit of the status word

indicates whether the board is in a lockout state. The

IBLOC function is used to simulate a

front panel RTL switch if the computer is used as an instrument.

Example

Return GPIB board 1 to local state.

C int gpib1;

gpib1 = ibfind("GPIB1");

ibloc (gpib1);

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Measurement-computing GPIB-488 Manual do Utilizador Página 41