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2
Installation
Making the Back Panel Connections
16
Accela PDA Detector Hardware Manual
Tip When the Accela PDA Detector is part of an Accela LC system, connect the system
interconnect cable to these terminals (see
page
12).
RUN
The RUN input receives an inject signal from the autosampler. The system interconnect cable
connects the RUN input to the signal from the autosampler.
ZERO
Use the ZERO connection on the back panel of the detector to zero the detector signal output
from a remote device (generally at the start or end of each sample run).
You can remotely zero the Accela PDA Detector with either a TTL low signal or with a
contact closure.
The system interconnect cable connects the ZERO input to the signal from the autosampler.
EVENT
Use the EVENT output connection to trigger an external device such as a fraction collector.
Set up the parameters for this signal in the instrument control method created in the Xcalibur
or ChromQuest data system.
If you use a TTL signal to trigger the external device, connect the PDA EVENT terminal
(pin 8) to the positive pin on the external device input, and connect one of the PDA GND
terminals (either pin 1 or 7) to the external device negative pin. The Accela PDA Detector has
open collector outputs that require a pull-up resistor (typically 10 kΩ) when connecting to
TTL inputs.
Note The external device input terminal might not have markings indicating positive and
negative polarity. In this case, connect the PDA EVENT terminal to one of the pins, and
connect a PDA GND terminal to the other pin.
If you trigger the external device by contact closure, connect the PDA +5 V output (pin 2) to
the positive input terminal of the external device, and connect the PDA EVENT output
(pin 8) to the negative input terminal of the external device.
"Connecting the System Interconnect Cable"
on
Thermo Scientific
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