JOHNSON CONTROLS
114
FORM 150.62-NM9 (709)
HANDLING AND STORAGE
.
TABLE 34 –
KEYPAD PIN ASSIGNMENT MATRIX
KEYPAD
PIN CONNECTIONS
STATUS
1 TO 5
OPER DATA
1 TO 7
1 TO 6
HISTORY
1 TO 8
UP ARROW
2 TO 5
DOWN ARROW
2 TO 7
ENTER/ADV
2 TO 6
COOLING SETPOINTS
2 TO 8
SCHEDULE/ADVANCE DAY
3 TO 5
PROGRAM
3 TO 7
OPTIONS
3 TO 6
CLOCK
3 TO 8
KEYPAD
The operator keypad is connected to the I/O Board by a
ribbon cable, which is connected to J2 on the I/O Board.
The integrity of a specific “button” on the keypad can be
verified by doing a continuity check across two specific
points (or pins), that represent one of twelve “buttons”
on the keypad.
Table 34 lists the key/pin assignments for the keypad.
Power to the I/O Board must be turned off, and the
ribbon cable disconnected from the I/O Board prior
to conducting the tests, or component damage may
result.
After the ribbon cable is disconnected from I/O Board,
ohmmeter leads are connected to the pins representing
the specific “button” to be tested. After connecting the
meter leads, the “button” being checked is pressed and
a reading of zero ohms should be observed. After releas-
ing the “button,” the resistance value should be infinite
(open circuit).
Pin 1 is usually identified by a stripe
on the ribbon cable.
Summary of Contents for YORK YCAL0043E Series
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