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Chapter 3 GPIB 488.1 Library Reference

Programming Reference Manual 3-18 GPIB-488

IBEOS

Changes or disables End-Of-String termination mode.

Syntax

C ibeos (int boarddev, int eos)

Parameters

boarddev is an integer containing the board/device handle.

eos is an integer that defines which termination mode and what EOS character are to be used,

as shown in Table 3-4, Selecting EOS.

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. If an error does not occur the previous

value of

eos is stored in iberr.

Usage Notes

This call only defines an EOS byte for a board or device. It does not cause the handler to

automatically send that byte when performing writes. Your application must include the EOS

byte in the data string it defines.

If this call defines an EOS for a device, then the defined EOS is used for all reads and writes

involving that device. Likewise, if the call defines an EOS for a board, then all reads and

writes involving that board will use that EOS.

Table 3-4. Selecting EOS

Method Description

eos

High Byte Low Byte

A Terminate read when EOS is detected. Can be used

alone or in combination with Method C. (Constant =

REOS)

00000100 EOS

character

B Set EOI with EOS on write function. Can be used alone

or in combination with Method C. (Constant = XEOS)

00001000 EOS

character

C Compare all 8 bits of EOS byte rather than low 7 bits for

all read and write functions. (Constant = BIN)

00010000 EOS

character

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 115 116

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Measurement-computing GPIB-488 Manual de usuario Pagina 31