Measurement-computing GPIB-488.2 Instrukcja Użytkownika Pobierz pdf (Strona 19)

GPIB 488.2 Porting Guide 986992 IOtech to Associated MCC APIs 3-1

IOtech to Associated MCC APIs Alphabetical Listing 3

This chapter includes the IOtech routines which were previously used for Driver488/W95 and Driver488/WNT. It

also includes the associated MCC GPIB 488.2 commands which are now to be used in place of the IOtech

commands. Syntax examples provided are in the C language.

For detailed information refer to the GPIB Porting Guide folder at www.iotech.com. The folder is located on our

Tech Manuals Download Page. It includes this porting guide and the following documentation:

o Personal488 User's Manual for Windows 95/98/Me/NT/2000

p/n 495-0903 (for IOtech API)

o GPIB-488 Programming Reference Manual

p/n 371930C-01 (for MCC 488.2 commands)

o GPIB-488 Code Examples

IOtech GPIB Command Associated MCC GPIB 488.2 Command(s)

Abort

SendIFC

ResetSys

Syntax

Abort INT WINAPI Abort(DevHandleT devHandle);

SendIFC SendIFC(int board)

ResetSys ResetSys(int board, short addresslist[])

Usage Notes

Abort, no longer to be used, caused the Interface Clear (IFC) bus management line to be

asserted for at least 100µs. It forced all IEEE 488 device interfaces into a quiescent state.

SendIFC is used as part of the GPIB initialization procedure. When the system controller

asserts the IFC line, it unlistens and untalks all GPIB devices, forcing them to an idle state. The

system controller also becomes the Controller-In-Charge (CIC). In the following example we

clear the GPIB bus from Board 0.

Example:

SendIFC(0);

ResetSys initializes the GPIB bus and all specified devices. First, the system controller asserts

the REN (Remote Enable) line and then the IFC (Interface Clear) line. This action unlistens and

untalks all of the attached GPIB devices and causes the system controller to become the

Controller-In-Charge (CIC).

The Device Clear (DCL) message is then sent to all of the connected devices. This forces the

devices to return to their default states and ensures that they can receive the Reset (RST)

message. A reset message (RST) is then sent to all of the devices specified by addresslist. This

resets the devices to specific parameters.

In the following example we are resetting GPIB devices which are connected to GPIB board 0

and assigned GPIB bus addresses of 6 and 7.

Example: short addresslist[3] = {6, 7, NOADDR};ResetSys(0, addresslist);

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Measurement-computing GPIB-488.2 Instrukcja Użytkownika Strona 19