To use 2 channels, you need declare... short channels [] = {1, 2}; short nChannels = 2; and call... status = pl1000SetInterval(g_handle, &usForBlock, nSamples, channels, nChannels); status = pl1000GetValues(g_handle, &samples[0], &nSamplesCollected, overflow, &triggerIndex); The samples array will h...