Thermo Scientific Accela UV/Vis Plus Hardware Manual page 52

2
Installation
Making the Back Panel Connections
ZERO Input Signal
EVENT Output Signal
36 Accela UV/Vis Detector Hardware Manual
For other autosamplers or injectors, first determine whether the device uses a TTL signal or a
relay (a contact-closure), to remotely trigger detectors. Refer to the autosampler or injector
documentation to determine whether a TTL signal or relay is used. Then wire the device to
the UV/Vis detector, by doing one of the following:
• If the autosampler or injector uses a TTL signal to trigger the run, connect the TTL
trigger to the RUN terminal on the UV/Vis detector, and connect the signal ground
terminal on the autosampler (or TTL return terminal) to the GND terminal on the
UV/Vis detector.
• If the autosampler or injector device output relay consists of a single, normally open
terminal and a common ground terminal, connect the normally open terminal to the
RUN terminal on the UV/Vis detector, and connect the common ground terminal to the
GND terminal on the UV/Vis detector. If both of the relay contacts are electrically
isolated from each other and from ground (the device simply closes a contact between the
two relay terminals), then connect either one of the relay terminals to the RUN terminal
on the UV/Vis detector, and connect the other relay terminal to the GND terminal on
the UV/Vis detector.
Note The ground (GND) terminals (pins 1 and 7) on the back of the UV/Vis detector are
tied to a single digital ground. You can use either ground terminal for digital input or
output return connections.
The UV/Vis detector does not use the ZERO connection.
Thermo Scientific data systems do not support this output signal.
Thermo Scientific