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Chapter 21: The IDEXX-DR* Relay Box
21.1 Hardware Description
The IDEXX-DR* Relay Box may be part of your IDEXX-DR Digital Imaging System. (See “15.3
Equipment Diagram,” to see how the box is connected to the system.) The relay box provides:
An interface between the following components:
• The foot switch or hand switch you use to prep and expose
• The DR controller box
• The generator’s prep/expose circuit
• A visual display of system status during operation
• Electrical isolation between the x-ray generator and your IDEXX digital radiography system
The relay box replaces the black and white boxes that were used in earlier DR system configurations.
21.2 Background on Generator Interfaces
Two kinds of high voltage (HV) generator types are generally found at veterinary practices. After the
relay box is installed, the foot switch works the same with either kind of generator (press the switch
half way to prep and the rest of the way to expose).
However, the foot switch works differently when the two types of generator are used with film or other
non-DR systems, so this is one way to differentiate between generator types:
• The majority of HV generators work the same way in DR or non-DR system (press the switch half
way to prep and the rest of the way to expose). These prep/expose generators are connected to
the relay box with three or four wires.
• A smaller number of HV generators are pulse (two step) generators where, in a non-DR
configuration, you press the foot switch once to prep and a second time to expose.
21.3 Using the IDEXX-DR Relay Box
The front panel of the IDEXX-DR Relay Box is shown below.
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