VTI Instruments EX1401, User Manual

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EX1401 Basic Operation 41
0x00000002 Transducer Upper Limit
The signal is above the defined range of the
transducer’s EU conversion. This is either the limit of
the NIST polynomials, for standard thermocouple
types, or the user-supplied value of
Channel.Tranducer.UpperLimit.
0x00000004 Transducer Lower Limit
The signal is below the defined range of the
transducer’s EU conversion. This is either the limit of
the NIST polynomials, for standard thermocouple
types, or the user-supplied value of
Channel.Tranducer.LowerLimit.
0x00000008 User Upper Limit
The signal is above the user-defined value of
Channel.Overload.UserUpperLimit, and
Channel.Overload.UserLimitEnabled is True.
0x00000010 User Lower Limit
The signal is below the user-defined value of
Channel.Overload.UserLowerLimit, and
Channel.Overload.UserLimitEnabled is True.
0x00000020 Open Transducer
The OTD trickle current is enabled and has caused
the input voltage to rise above the upper limit of the
ADC’s valid input range.
0x00010000 ADC Overload
The signal is outside of the ADC’s valid input range,
either too high or too low.
0x00100000 ADC Sync
The channel’s ADC has become unsynchronized
from the others in the instrument, likely due to
electrostatic discharge. While this status bit remains
set, the firmware is resynchronizing it.
T
ABLE
3-3: O
VER
L
OAD
C
ONDITIONS AND
I
NDICATIONS
Any of these bits can be enabled to drive the state of the front-panel LEDs or any of the instrument’s
trigger outputs (EXT, DIO0-7, LAN0-7). For more information, see the LED Indications
and
Overload and Trigger Outputs sections.
Any of these bits can also be enabled as latching. If this is set, the bit will only become unset in the
status at the beginning of a new acquisition, or when explicitly cleared by the user.
Each block of data read from the instrument will include a single bit indicating whether any overload
status bits were set for any of the included samples. This provides a simple, quick indication of
whether the data is valid for a particular block.
LED I
NDICATIONS
As an LXI standard compliant instrument, the EX1401 instrument provides multiple LED indicators
on the front and rear of the instrument to indicate the power, network connectivity and
synchronization status.
Power LED (PWR)
This is a single colored LED. If the LED is glowing Solid Green, it indicates that power is applied
to instrument, and is in active states.
LAN LED
This is a Bi-color LED (Red/Green), used for indicating the basic network connectivity status. The
LED glows in solid green color, when the device is successfully connected to a network, without
any conflict/error. If there is a problem with the LAN connectivity, this indicator turns to solid red