LVDT Measurement (Module L*)68C3 Operations Manual North Atlantic Industries, Inc. 12/19/2014Rev: 2014-12-19-0947 www.naii.com Page 217 of 330Hi-Threshold:The Hi-threshold level is used to set or reset the high limit bit (B2) of the individual channel status register in thememory location. When the “Words in FIFO” counter is greater than or equal to the value stored in the hi-threshold register, the high limit bit (B2) of the channel status register will be set. When the “Words in FIFO”counter is less than or equal to the value stored in the hi-threshold, the high limit bit (B2) of the channel statusregister will be reset.Set = “logical 1”Reset = “logical 0”Description Hi-Threshold (16-bit hex)Hi-Threshold in ch1-4 Data Range: (0x0000-0xFFFF)Low-Threshold:The low-threshold level is used to set or reset the low limit bit (B1) of the individual channel status register in thememory location. When the “Words in FIFO” counter is greater than or equal to the value stored in the low-threshold, the low limit bit (B1) of the channel status register will be reset. When the “Words in FIFO” counter isless than or equal to the value stored in the low-threshold, the low limit bit (B1) of the channel status register willbe set.Set = “logical 1”Reset = “logical 0”Description Low-Threshold (16-bit hex)Low-Threshold in ch1-4 Data Range: (0x0000-0xFFFF)Delay:Set the number of delay samples before the actual FIFO data collection begins. The data collected during thedelay period will be discarded.Description Delay (16-bit hex)Delay in ch1-4 Data Range: (0x0000-0xFFFF)Size:Set the size of the FIFO buffer. The largest size that a FIFO buffer can be is 65,535(0xFFFF)Description Size (16-bit hex)Size in ch1-4 Data Range: (0x0000-0xFFFF)Sample Rate:The sample rate sets the sampling rate for the FIFO buffer. The rate is based on the product of 5.12 s x SampleRate. For example, if the rate is set to 2, the FIFO buffer will be sampling at 5.12 s * 2 = 10.24 s.Description Sample Rate (16-bit hex)Rate in ch1-4 Data Range: (0x0000-0xFFFF)Clear FIFO:Whenever the Clear memory is set or reset for the individual channel, it initializes the “Words in FIFO” to zero. Aread to the “L(R)VDT Data” register gives aged data.Description Clear FIFO (16-bit hex)Clear in ch1-4 Data Range: (0x0000-0xFFFF)
