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2-17
Installation 2
Input/Output Ports
You can use the input and output contacts found
on the rear panel of the liquid handler to control
peripheral devices. Refer to the diagram on page
2-16 for the location of the input/output ports.
Contact inputs
The input terminal block of the liquid handler has
eight contacts. All of the inputs are paired, and
each pair includes a GROUND reference ( ).
The contact input pairs are labeled A, B, C, and D.
A contact is connected if it has a short across the
input or is held low by a TTL output or other
device.
Never connect voltages higher than 5V DC to an
input. When using TTL signals, be sure to match
GROUND connections.
Contact outputs
The output terminal block has 10 contacts.
Pins 1 and 2 supply a +24V DC output. Do not use
this output unless the receiving device can accept
24V power.
Pins 3 through 10 are paired, isolated-relay contact
closures and are labeled 1, 2, 3, and 4.
Items you’ll need
To make connections, you’ll need the following:
• 2-conductor cable (22–30 gauge for each wire)
• wire insulation stripper
• small-blade screwdriver
You can purchase a 6-foot piece of suitable cable
(part number 709910206) or a package of five
cables with identification markers (part number
36078155) from Gilson.
Electrical Connections