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Optional Onboard Reference Control
75DS2 Operations Manual
North Atlantic Industries, Inc.
11/11/2011
Rev: 2011-11-11-1000
www.naii.com
Page 30 of 43
O
PTIONAL
O
NBOARD
R
EFERENCE
C
ONTROL
OSC (Optional Onboard Reference Supply) Set Frequency
Type:
Two 16-bit unsigned integer
Range:
360 to 10,000 Hz
Read/Write:
R/W
Initialized Value:
N/A (S/R or L/R module Dependant)
Program Reference Frequency,
where LSB is 0.01 Hz.
For Example
, 400 Hz = 0x9C40. Reference Module is
Optional.
REGISTER
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
FUNCTION
-
8192
4096
4096
2048 1024
512
256
128
64
32
16
8
4
2
1
approximate value
OSC SET FREQUENCY
X
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D=DATA BIT (Hz)
OSC (Optional Onboard Reference Supply) Set Voltage
Type:
Two 16-bit unsigned integer
Range:
2.0 to 28.0 Vrms, or 115 Vrms
Read/Write:
R/W
Initialized Value:
0
Program Reference Voltage,
where LSB is 0.01 Vrms.
For Example
, 26.1 Vrms = 0x0A32. Reference Module is
Optional.
REGISTER
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
FUNCTION
-
-
-
-
-
-
-
25.6
12.8
6.4
3.2
1.6
0.8
0.4
0.2
0.1
approximate value
OSC SET VOLTAGE
X
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D
D=DATA BIT (Vrms)
Note:
Only Slot 1 Module controls Onboard Reference Supply
PCI Memory Map
0330
OSC Set Voltage Low
W/R
0334
OSC Set Voltage High
W/R
0338
OSC Set Frequency Low
W/R
033C
OSC Set Frequency High
W/R
Example(s):
Program optional Onboard OSC Frequency to 1 KHz:
Write 0x0001 in register 0x0334
Write 0x86A0 in register 0x0330
Program optional Onboard OSC Voltage to 115 Vrms:
Write 0x0000 in register 0x033C
Write 0x2CEC in register 0x0338