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The Model 242L/244L handle assembly is made of GE Lexan

Type 121, which is a super

durable polycarbonate resin. The design of this assembly strengthens and protects the whole

PCB assembly much better than conventional metal face plates.

1.4 INSTALLATION AND ADJUSTMENTS

Installation of the unit consists of plugging into the appropriate slot of the Input File and

connecting the assigned inputs to the proper cabinet terminals. The edge connector is keyed

to prevent incorrect installation. Following power-up, a front panel LED test will illuminate

both OUT indicators for two seconds.

If desired, the output pulse width for both channels can be set to 100 milliseconds minimum

by installing jumper "100ms" (J4-A).

The polarity of the input can be inverted such that a closed contact input is False and an

open contact input is True. The input polarity of Channel 1 can be set to invert by installing a

jumper into the "CH1 POL" (J4-B). The input polarity of Channel 2 can be set to invert by

installing a jumper into the "CH2 POL" (J4-C). The input polarity of Channel 3 can be set to

invert by installing a jumper into the "CH3 POL" (J4-C). The input polarity of Channel 4 can

be set to invert by installing a jumper into the "CH4 POL" (J4-D).

Reference designators shown are for Channel 1. Reference designators for Channel 2 are

shown in parenthesis.

The sensor circuitry can be broken down into seven major blocks. Each "Input Circuit" block

contains the electrical transient devices and the input biasing circuit. Although the Model

242L (244L) has two (four) DC inputs, a single digital processing section is used to process

both inputs.

The microcontroller unit "MCU" Block provides the input voltage threshold and input pulse

width filtering function on both channel 1 and channel 2 DC input circuits.

The MCU then controls the OUTPUT and DISPLAY blocks appropriately. The TEST switches

can be used to force the input to the True state. If the TEST switch is in the ON (locked) or

MOM (momentary) position it will force the output to the asserted (True) state regardless of

the input circuit state. The TEST switches are processed through the MCU for pulse width

input and output requirements.

Valid output calls are made via optically isolated solid state transistors. Output calls are

indicated on the front panel by means of red LEDs labeled "OUT".

Eberle Design Inc.

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