SAIC Exploranium – GR-135 System Manual page: 8
d) JOYSTICK - The GR-135 has only one operating control - the rubber-covered joystick on the
handle. All system functions are controlled by the JOYSTICK that permits very easy instrument
functions EVEN WHEN WEARING GLOVES IN A BIOHAZARD SUIT. The JOYSTICK is a
specially designed switch with five actions – UP, DOWN, LEFT, and RIGHT. The JOYSTICK and
use of menu driven functions makes the GR-135 very easy to operate and avoids the necessity of
“memorizing” complex sequences of action.
OPTIONAL: for AUTOMATIC mode users only – a handle with a single PUSH-BUTTON switch is
available to make user actions as simple as absolutely possible.
e) DISPLAY - An LCD is used for the GR-135 to permit a full range of alphanumeric and graphic
display capabilities. This LCD gives excellent contrast in high light conditions but is not easily
visible in low light conditions.
To solve this problem, the system has a “BACKLITE” function, which provides excellent visibility
in a low light environment. The display contrast may also be manually adjusted depending on
ambient light conditions. The unit also incorporates automatic temperature compensation to
maintain correct contrast even when the temperature substantially changes.
f) BACK-DOOR - The GR-135 has a back door that is removable by a ¼ turn of the integrated
handle. The door may be removed to allow access to the battery compartment to change
batteries and the I/O connectors as required. These connectors are for use when the supplied
Docking-Station is inconvenient. The door is gasketed to provide a high degree of water
protection when in place.
Rear View with Battery Door Removed
COM - RS-232 Communication Connector
AUTOMATIC/MANUAL SWITCH
12 - VDC – Battery Charging Connector
EARPHONE JACK
g) BATTERIES - The GR-135 requires two D-cell batteries. Three types of batteries can be used.
Standard Nickel-Cadmium rechargeable batteries provide 8 hours of normal operation when fully
charged. Nickel-Metal Hydride rechargeable batteries provide 12 hours of operation when fully charged.
Alkaline batteries may also be used. They provide 12 hours of normal operation.
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