GPIB-PC Functions — Introduction Section ThreeGPIB-PC User Manual 3-12 ©National Instruments Corp.IBWRT (bd,buf,cnt) andIBWRTA (bd,buf,cnt)Both functions use the specified board to write to one or more devicesthat have already been addressed to listen (for example, by the IBCMDor IBCMDA function). The syntax for these low-level functions is thesame as their high-level counterparts of Group I and III. The softwareautomatically differentiates between bd descriptors that refer to devicesand those that refer to boards, and executes the write operationsappropriately.IBWRTI and IBWRTIA are also available in BASIC for binary transfersfrom an integer array.IBSTOP (bd)IBSTOP aborts any asynchronous operation associated with the board.IBWAIT (bd,mask)IBWAIT waits for the specified board to detect one of the eventsselected in the mask bit vector to occur. These events include thecompletion of asynchronous input/output (CMPL); the board becoming atalker (TACS), listener (LACS), or Controller-In-Charge (CIC);detection of a GPIB Service Request (SRQI); assertion of the Attentionsignal (ATN); detection of the END message (END); or detection of atime limit (TIMO) or other error condition (ERR).IBTMO (bd,v)IBTMO changes the time limit in which operations with the board mustcomplete.IBONL (bd,v)IBONL performs the same initialization function for boards as the GroupIII IBONL function does for devices. In addition, the hardware as wellas the software is reset and the board is placed online (enabled) oroffline (disabled).IBSIC (bd)IBSIC uses the board to initialize the GPIB by sending the InterfaceClear (IFC) message.
