A/D (Modules C1, C2, C3, C4 & CA)68C3 Operations Manual North Atlantic Industries, Inc. 12/19/2014Rev: 2014-12-19-0947 www.naii.com Page 107 of 330Data ReadTwo’s complement format for bipolar mode; 7FFFh=+FS, 8,000h=-FS. For unipolar mode, range is from 0h toFFFFh = FS.Range & PolarityFormat input for range and polarity. Range is dependent upon module. Encode range using data bits D0 throughD3. Program polarity using data bit D4. Enter per table. Does not apply to Current Measurement Module (C3).REGISTER D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0RANGE & POLARITY X X X X X X X X X X X D D D D DMODULE C4 C2 C1RANGE 50.0 V 40.0 V N/A 1 0 1 025.0 V 20.0 V N/A 1 0 0 112.5 V 10.0 V 10.0 V 0 0 0 06.25 V 5.00 V 5.00 V 0 0 0 1N/A N/A 2.50 V 0 0 1 0N/A N/A 1.25 V 0 0 1 1N/A N/A N/A 0 1 0 0 For bipolar/uni-polar selection, program D4 as “0” for unipolar and “1” for bipolar.Filter Break FrequencyThe break frequency is the 3 db point of a single pole low pass filter. Enter desired frequency for each channelbetween 10 Hz to 10 KHz as a 16-bit binary number. (1 Hz LSB). The break frequency must not be less than 10%of the clock rate frequency. (Example: For a clock rate frequency of 2 KHz, the Filter Break Frequency should beno less than 200 Hz). Zero disables filter.Latch All A/DsLatch all A/D channels by writing “1” to D0 of Latch register. Write “0” to unlatch all channels.D0 Test RangeSpecify voltage range for A/D module under test. D0 test is performed only on A/D modules. Enter per table.NOTE: for Current Measurement Module C3, enter up to 2.5V for 25mA FS, unipolar selection only.REGISTER D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0A/D D0 TEST RANGE X X X X X X X X X X X D D D D DMODULE C4 C2 C1RANGE 50.0 V 40.0 V N/A 1 0 1 025.0 V 20.0 V N/A 1 0 0 112.5 V 10.0 V 10.0 V 0 0 0 06.25 V 5.00 V 5.00 V 0 0 0 1N/A N/A 2.50 V 0 0 1 0N/A N/A 1.25 V 0 0 1 1 For bipolar/uni-polar selection, program D4 as “0” for unipolar and “1” for bipolar.
