2-10 Setting Up the Detector
Tip: For pin-out connections to the 2475 detector, see the figure “I/O signal
inputs and outputs” on page 2-11.
Choosing signal connections
Tip: Connect the 2475 detector to other HPLC system components through an
Ethernet connection.
The rear panel provides two analog connectors and an RS-232
communications port for operating the detector with external devices. You can
connect other instruments to the detector through these connectors to enable
the following signals:
• Analog outputs – Two attenuated, analog-channel outputs, Detector
Out 1 and Detector Out 2, support 1-V output to external devices or data
systems. For input/output voltage current specifications, see Appendix
B. The 1-V output for channel A and channel B is scaled according to the
EUFS (emission/energy units full scale) setting for each channel. The
detector allows the EUFS to be set individually for the output on each
channel. Volts per EU are calculated for the 1-V output as follows:
Volts out = Fluorescence × 1 V/EUFS
For example, an EUFS setting of 10,000 provides a traditional 0.0001
V/EU output. An EUFS setting of 100,000 provides a 0.00001 V/EU
output, which supports chromatography above 10,000 EU.
• Chassis ground stud – Connect the shield from analog connections
here.
• Switched outputs – You can program two switch contact closures to
turn on, off, toggle, pulse once for a defined duration, or pulse
repetitively for a specified period of time.
• Event inputs – Four general-purpose TTL contact closures on the
detector’s A (Inputs) terminal support the following functions (see the
table titled “Primary and secondary function (method) parameters” on
page 3-21):
– Remote or inject start
–Lamp on/off
– Chart mark input
– Auto Zero
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