Intelligent Motion Systems UDAS-1001E - Manual (Page 15)

UDAS-1001E Series Data Acquisition Systems
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Example:
If 9 channels are being scanned at a rate of 100Hz and the slope is low to high, the trigger signal
must remain below the trigger level for 9/100 of a second, and above the trigger level for 9/100 of a
second to ensure that a trigger event occurs. When using External Input as the trigger, this
restriction does not apply.
When using an analog input channel for triggering, analog output channel 1 is used to set the
trigger level.
Due to the internal configuration of the unit, the voltage appears on the analog output 1 pin as
the negative value of the desired trigger voltage. Connecting this pin to another signal, or
shorting it out causes the trigger voltage to be incorrect.
Auto Zero Auto Zero
When in auto zero mode, the inputs to the Analog input circuit are internally grounded, disabling
the input multiplexers. This enables a known 0 volt signal to be measured, and the value read can
be used to compensate for input offset errors.
Analog Output Analog Output
The UDAS device has two analog output channels. Each output channel has 12-bit resolution and
a ±10 V output range. A FIFO is available for waveform generation.
This FIFO can be used as a circular buffer for either or both analog output channels to allow
repetitive waveform generation and supports waveforms of up to 512 points (single channel) or
256 points (dual channel). The unit also supports non-repetitive wave forms.
When the unit is powered-on and the analog outputs are not enabled, the output voltage is 0 V.
This provides a known voltage when the UDAS unit is powered-up.
Analog output channel 1 is also used to support the analog trigger function for hardware-paced
analog input conversions (as described above).
Digital I/O Digital I/O
The digital data acquisition circuit consists of two 8-bit digital I/O ports providing 16 digital I/O
bits and one 32-bit counter. Output power-on states are configured for Port 1 through an internal
DIP switch. The digital I/O is configured as 2 ports (0 and 1) of eight bits each.
Note:
Do not use analog output channel 1 for any other purpose while analog
triggering is in use.