Measurement Computing GPIB-488 - Manual (Page 79)

Chapter 4 GPIB 488.2 Library Reference
GPIB-488 4-11 Programming Reference Manual
PPollConfig
Configures a device for parallel polls.
Syntax
C PPollConfig(int board, short address, int
dataline, int sense)
Parameters
board is an integer which identifies the GPIB board to be used for this operation. In most
applications, this value is 0.
address is the address of the GPIB device to be configured for a parallel poll.
dataline specifies which data line (1-8) the device uses to respond to a parallel poll.
sense can be 1 or 0, specifying the condition under which the data line is to be
asserted/unasserted. The device compares this value to its Individual Status Bit (IST) and then
responds accordingly. For example, if
sense = 0 and the device asserts the specified data line
if its IST bit = 0 and unassert the data line if its IST bit = 1.
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.
Usage notes
Remember that if a device is locally configured for a parallel poll, the Controller's parallel poll
configuration instruction is ignored.
Example
Configures the device connected to board 0 at address 6 to respond to parallel polls on line 7
with sense 1. The device asserts line 7 if its IST bit = 1, and unasserts line 7 if IST = 0.
C PPollConfig(0, 6, 7, 1)