D E T A I L E D A R C H I T E C T U R E
Data Device Corporation
SB-36230KX Manual
Rev G – 4/19
15
information is reported through a register that is accessible through software. See the
SelfTest()
function for details.
4.1.6
Reference Input Frequency Detector
Each channel is capable of reporting back the carrier frequency (Hz) that is being
applied to its reference inputs (RH/RL). This information is accessible through
software using the
Get_D2rsChRefFreq()
function. The tolerance on this reading is
+/- 5%.
4.1.7
Loss-of-Reference Status
Each channel has the capability to detect for Loss-of-Reference (LOR). If the
reference input to a channel falls below a threshold, an internal register flag will be set
to a logic 1.
The threshold for the
SB36231KX
model card is dependent on the maximum
reference input voltage of the output type selected (Refer to Table 3).
•
For a maximum reference input voltage of 26 Vrms, the LOR threshold is 3.8
Vpeak.
•
For a maximum reference input voltage of 6.8 Vrms, the LOR threshold is 1
Vpeak.
The threshold for the
SB36232KX
model card is 16.9 Vpeak.
This flag will return to a logic 0 once the reference input voltage goes above this
threshold. See the
Get_D2rsRefStatus()
function for details.
4.1.8
DC-to-DC Converter Status
There are up to two DC-to-DC converters on the device that are used for the digital-to-
Synchro / Resolver channels depending on the channel count (See Table 4). Each
DC-to-DC converter has over current protection.
If either one goes into an over current condition, all channels on the device will
shutdown. Once this occurs, a power cycle to the computer will be necessary to
restore all channels.
Each DC-to-DC converter’s active status is monitored in a register accessible through
software. See the
Get_D2rsRefStatus()
function for details.