Measurement-computing GPIB-488 Manual do Utilizador descarregar pdf (Página 21)

Chapter 3 GPIB 488.1 Library Reference

Programming Reference Manual 3-8 GPIB-488

IBCMD

Sends GPIB commands.

Syntax

C ibcmd (int board, char cmnd[], long bytecount)

Parameters

board is an integer containing the board handle.

cmnd is the command string to be sent. This string is comprised of GPIB multiline commands.

These commands are listed in Appendix A, Multiline Interface Messages.

bytecount is the number of command bytes to be transferred.

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.

ibcnt, ibcntl will contain the number of bytes that were transferred. ibcnt is a 16-bit

integer.

ibcntl is a 32-bit integer. If the requested count was greater than 64 K, use ibcntl

instead of

ibcnt.

Usage Notes

This routine passes only GPIB commands. It cannot be used to transmit programming

instructions (data) to devices. Use the

ibrd and ibwrt routines for this purpose.

This routine terminates when any one of the following takes place:

• Commands transfer is successfully completed.

• An error occurs

• A timeout occurs

• A Take Control (TCT) command is sent

• The system controller asserts the IFC (Interface Clear) line.

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