Data Translation DT9837, User Manual

Page: 137 / 150

Register-Level Programming
137
Writing to EEPROM to Change the Coupling Type and Current
Source
The Open Layers Control Panel has controls for setting the coupling type and current source
for analog input channels 0, 1, 2, and 3, and for keeping the high power mode always on or off.
You can change these settings programmatically by writing to the EEPROM on the DT9837
module.
The EEPROM_OFFSET_SETTINGS control (15) is used to store the coupling type and current
source values for the DT9837.
Table 36 describes the bit values in the
EEPROM_OFFSET_SETTINGS control that are used to store the coupling type and current
source values on the DT9837 module.
Table 36: DT9837 EEPROM Byte (EEPROM_OFFSET_SETTINGS)
for the Coupling Type and Current Source
Bits Type Default Name Description
[0] RW 1 ADC 0 Coupling Select the coupling type for analog input
channel 0:
0 – AC
1 – DC
[1] RW 1 ADC 1 Coupling Select the coupling type for analog input
channel 1:
0 – AC
1 – DC
[2] RW 1 ADC 2 Coupling Select the coupling type for analog input
channel 2:
0 – AC
1 – DC
[3] RW 1 ADC 3 Coupling Select the coupling type for analog input
channel 3:
0 – AC
1 – DC
[4] RW 1 ADC 0 Current Source Select whether or not to use the 4 mA current
source for analog input channel 0:
0 – Enabled
1 – Disabled
[5] RW 1 ADC 1 Current Source Select whether or not to use the 4 mA current
source for analog input channel 1:
0 – Enabled
1 – Disabled
[6] RW 1 ADC 2 Current Source Select whether or not to use the 4 mA current
source for analog input channel 2:
0 – Enabled
1 – Disabled
[7] RW 1 ADC 3 Current Source Select whether or not to use the 4 mA current
source for analog input channel 3:
0 – Enabled
1 – Disabled