The Computer
5-56 Manual # 42-02-1P21
F2: External Memory Mode
External Memory mode can be used to view memory addresses in
the external RAM on the HC-MPU board. The external memory
address is denoted by the letters DA (Data Address). The ability to
view the external memory can also be helpful for diagnosing and
troubleshooting the elevator system. The Computer External
Memory Chart (page 5-58) shows the meaning of the data digits at different addresses.
Getting Into External Memory Mode
External Memory mode is initiated by placing the F2 switch in
the up position. The following is a description of the LCD display
format and the function of the N, S, +, and - push buttons during
External Memory mode.
Function of N Push Button
The N push button allows for the advancement of the computer memory address, which is dis-
played on the second line of the LCD display. For example, for this display, pressing the N push
button once (hold it for 1-2 seconds) will cause the 1 in the address 1234 to begin blinking. By
continuing to press the N push button, the 2 in the address 1234 will begin to blink. The cycle
will continue while the N push button is being pressed. Once the digit needed to be changed is
blinking, the address can then be modified.
The data (8 digits) that correspond to the external memory address is displayed to the right of
the address. This data display will change as the memory address changes.
Function of S Push Button
The S push button ends the ability to change the address by stopping the digit from blinking. If
the S push button is not pressed, the selected digit will stop blinking automatically after 20 sec-
onds.
Function of + Push Button
The + push button modifies the digit of the computer memory address selected by the N push
button. If the + button is pressed, the selected digit is incremented by one. The data display will
also change as the address changes. For example, if the 2 of the address 1234 is blinking, press-
ing the + push button once will change the address from 1234 to 1334. Pressing the + push but-
ton several more times will change the address to 1434, 1534, 1634, etc., up to 1F34 and then
back to 1034.
Function of – Push Button
The – push button modifies the digit of the computer memory address selected by the N push
button. If the
– push button is pressed, the selected digit is decrement by one. The data display
will also change as the address changes. For example: If the 2 in the address 1234 is blinking,
pressing the
– push button once will change the address from 1234 to 1134. Pressing the – push
button several more times will change the address to 1034, 1F34, 1E34, etc.
FUNCTION SWITCHES
F8 F7 F6 F5 F4 F3 F2 F1
External Memory Mode
EXTERNAL MEMORY
DA.1234:1OOO1OOO
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