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1.1 GLOSSARY

A - Ampere

C - Celsius

Component - Any electrical or electronic device

DC - Direct Current

Firmware – Program code embedded into a microcontroller unit

Hz - Hertz

IC - Integrated Circuit

Jumper

- A means

of connecting/disconnecting two

or more conductive

soldering/desoldering a conductive wire or by PCB post jumper

LED - Light Emitting Diode

LOGIC - Negative Logic Convention (Ground True) State

mA - milliAmpere

ms - millisecond

MCU - Micro Controller Unit or microcontroller unit

MOV - Metal Oxide Varistor

Opto-coupler – An integrated circuit that provides electrical isolation

PCB - Printed Circuit Board

RMS - Root-Mean-Square

s – second

Schmitt Circuit – a circuit that provides hysterisis in the threshold

SW – Switch

uF - microfarad

VAC - Voltage Alternating Current

VDC - Voltage Direct Current

1.2 GENERAL DESCRIPTION

The Model 242L is a dual channel DC Isolator unit designed to meet Caltrans specifications

TEES 2009 including Errata #2 (December 2014). The Model 244L is a quad channel DC

Isolator unit in a half-width form factor. These isolator units occupy one position of a 33X

style standard input file. The isolator unit card incorporates a double-sided 44 pin edge

connector for the connection of power, input, and output signals. Each channel has individual

front panel controls for testing the operational mode, and high intensity front panel LEDs

which are used to indicate the output state. Outputs are optically-isolated solid-state

transistors. The Model 242L and 244L are powered from the 24VDC Cabinet Power Supply

and do not require AC Line.

While the Model 244L is interchangeable with the Model 242L, note that the Model 244L can

only be installed in the even numbered slots of a standard Input Assembly. The Model 244L

half-width form factor is primarily intended for use in rack assemblies designed for double

density (four channel half-width) detector/isolator units.

1.3 GENERAL CHARACTERISTICS

Each channel of the Model 242L/244L provides input hysterisis and digital filtering to qualify

the input signal. An input signal must meet the minimum pulse requirements specified in

section 1.7.4 in order to produce a valid output. The output pulse width for both channels can

be set to 100 milliseconds minimum by installing jumper "100ms" (J4-A).

Both the input and output circuits have been designed for maximum protection from electrical

transients. The inputs have been designed to withstand the discharge of a 10 uF capacitor

charged to +/- 1000 Vdc directly across the input pins, and a discharge of a 10 uF capacitor

charged to +/- 2000 Vdc applied through a source impedance of 5 ohms across the input

pins or to Equipment Ground. The outputs are protected by a transient clamp diode.

Eberle Design Inc.

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