Juniper Systems Allegro DAQ - Manual (Page 18)

18 User’s Guide
Switch # Switch Name Switch
Settings
Result
3 OPA_EN_H OFF Sensor Excitation control is
enabled continuously
4 DIO7_OUT ON
5 SENSOR_EXC OFF Sensor Excitation Output
disabled; Sensor Excitation
Bypass enabled 6 EXC_BYPASS ON
CAUTION: Switch 5 and Switch 6 should NEVER be in the “ON”
position at the same time. This could damage the NI DAQCard.
Enable current limit monitoring
The internal circuitry of the Sensor Excitation Output provides
a Current Limit Flag. The flag lets you determine if the devices
attached to the Sensor Excitation are drawing more current than the
Sensor Excitation is capable of supplying.
You can set the PFI5 Output on the NI DAQCard to monitor the
Current Limit Flag. Note that when the switches are set to do this,
the PFI5 is no longer available through the 50-pin D connector.
Switch # Switch Name Switch
Settings
Result
1 I_FLAG ON Current Limit Monitor
Enabled; PFI5 Output used
to monitor voltage current
2 PFI5_OUT OFF
Note: For the pod to function correctly, make sure Switch 1 and Switch
2 are never in the “ON” position at the same time.
Disable current limit monitoring and reconnect the PFI5
signal to the 50-pin connector
To make the PFI5 available again through the 50-pin D connector
again, set the switches as shown in the following table.
Switch # Switch Name Switch settings Result
1 I_FLAG OFF Current Limit Flag is
enabled; the Current
Limit Monitor is disabled
2 PFI5_OUT ON
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