Measurement-computing GPIB-488 Bedienungsanleitung PDF herunterladen (Seite 35)

Chapter 3 GPIB 488.1 Library Reference

Programming Reference Manual 3-22 GPIB-488

IBGTS

Puts an Active Controller in Standby mode.

Syntax

C i/jointfilesconvert/1732015/bgts (int board, int handshake)

Parameters

board is an integer containing the board handle.

handshake determines whether or not the shadow handshake option is to be activated. If

handshake is non-zero, then the GPIB shadow handshake option is activated. This means

that the GPIB board shadow handshakes the data transfer as an acceptor and when the END

message is detected, the GPIB board enters a

Not Ready For Data (NRFD) handshake

hold-off state on the GPIB. Thus, the GPIB board participates in the data handshake as an

Acceptor without actually reading the data. It monitors the transfers for the

END message and

holds off subsequent transfers. Using this mechanism, the GPIB board can take control

synchronously on a subsequent operation like

ibcmd or ibrpp.

handshake is 0, then no shadow handshake or holdoff is done.

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. The ECIC error occurs if the board is

not an Active Controller.

Usage Notes

This call makes the GPIB board go to Controller Standby state and unasserts the ATN line if

it is initially the Active Controller. This allows transfers between GPIB devices to occur

without the GPIB board's intervention.

Before performing an

i/jointfilesconvert/1732015/bgts with a shadow handshake, use the ibeos function to

define/disable EOS character detection.

Example

This example uses the ibcmd routine to instruct GPIB board 1 to unlisten

all devices (ASCII ?, hex 3F), and then to address a Talker at MTA26

(ASCII Z, hex 5) and a Listener at MLA11 (ASCII +, hex 2B).

i/jointfilesconvert/1732015/bgts is

then called to unassert the ATN line and place the GPIB board in Standby

mode. This action allows the Talker to send messages to the Listener. Note

that the GPIB commands/addresses are coded using printable ASCII

characters, for example, "?Z+".

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Measurement-computing GPIB-488 Bedienungsanleitung Seite 35