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52 VXI Programming Using the IEEE 1394 Serial Bus Chapter 3
// turn off autorange, set a 30V DCV range
errStatus = hpe1410_voltDcRang(vi, 0, 30);
check(vi, errStatus);
// set a 10 us aperture time
errStatus = hpe1410_voltDcAper(vi, 10.0e-6);
check(vi, errStatus);
// set 8000 readings
errStatus = hpe1410_sampCoun(vi, 8000);
check(vi, errStatus);
// store the readings in HP E8491A shared memory
// specify the E8491A shared memory base address
errStatus = hpe1410_memVmeAddr(vi, start_addr);
check(vi, errStatus);
// specify the amount of memory required
// (8000 readings * 8 bytes/reading)
errStatus = hpe1410_memVmeSize(vi, 64000);
check(vi, errStatus);
// enable the readings to be stored
errStatus = hpe1410_memVmeStat(vi, 1);
// disable multimeter error detection
hpe1410_errorQueryDetect(vi, 0);
// initiate the multimeter to take the readings
errStatus = hpe1410_initImm(vi);
// pause 30s to allow readings to complete
Sleep (30000);
// transfer the 8,000 readings (64,000 bytes) from the multimeter using
// the VISA function viMoveIn8
err = viMoveIn8(fw, VI_A24_SPACE, 0, 64000, (ViPUInt8)rdgs);
if(err < VI_SUCCESS) err_handler(fw, err);
// swap the bytes once they are transferred from shared memory
for (i=0;i<7999;i++)
{
SWAP_FLOAT64(&rdgs[i]);
}
// print some readings to verify the transfer was successful
for (i=0; i<10; i++)
{
printf("%lf\n", rdgs[i]);
}
// close the device sessions
hpe1410_close(vi); // close E1410 session
viClose(fw); // close E8491 session