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4.2 Keyboard
The keyboard is mounted to and directly connected to the DIG-T2
board and functions as an MMI (Man-Machine Interface). The keypad
serves as a control panel containing the command and programming
keys. It also includes an LCD display with two rows of 16 characters
for cycle progress updates and error messages. In addition it contains
the following light indicators:
— START (autoclave in process),
— FAIL (the process failed),
— WATER (no water in the reservoir),
— DOOR (blinks with buzzer sound when START is
pressed and the door is not closed).
For more detail on the control keys and error messages please see the
EHS Operators Manual
4.3 Digital Board DIG - T2
The digital board contains the microprocessor that runs the system
software program and controls all the functions of the EHS autoclave.
It is connected to the Keypad and digital display for interactive
communication with the operator. It is also connected to the ANL-T2
analog board for communication with the rest of the EHS autoclave. In
addition the DIG-T2 board has PC and printer communication abilities.
— The digital board is connected to the keypad and the ANL-T2
analog board via ribbon cables.
The DIG-T2 board receives human commands through the Keypad
and transmits visual information back, through the Keypad display
The DIG-T2 board receives sensory information, from system
sensors, in the form of digital signals through the ANL-T2 board. It
also transmits operational commands, in the form of digital signals,
to the various system components through the ANL-T2 board.
Power for the DIG-T2 is provided by the ribbon cable connected to
the ANL-T2
— The digital board also contains a parallel printer port for connection
to a proprietary printer. The printer is connected directly to this
board through connector DS1 via a ribbon cable. The printer
receives data and operating voltage directly from this connector.
— The PC interface establishes two-way communication between the
DIG-T2 board and a stand-alone personal computer, utilizing
proprietary software. This communication is via a connector
located on the ANL-T2 board and ribbon cable leading to an
external connector on the front panel.
— On the board, are three types of memories:
1) EPROM memory (U15) for storing the program codes.
2) RAM memory (U9) with a capacity of 64KB for the storage of
temporary data during the running of the program that is
located on the opposite side. This information is only for
general knowledge.
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