Terminator Functions; Clear Keypad Switch; Special Function Switch; Termination Switches - Watkins-Johnson Company WJ-8718A/MFP Instruction Supplement

TABLE 2-4 WJ-8718A/MFP
2.4.4.2.1
Terminator Functions
The software structure of the microprocessor in the receiver control block is such
that an accepted numerical keypad entry is not acted upon until a termination switch is
activated. The terminator informs the microprocessor how the number is to be used. Table 2-4
lists the termination switches and their associated function.
Table 2-4. Termination Switches
Switch Function
MHz RF frequency
kHz
BFa or RF frequency
RECALL Memory address
STORE Memory address
EXAM Memory address
DWELL Scan pause, in seconds
THRS Signal level threshold
LOCK OUT Memory address
Special Function
(*):
Access BITE (used with 17)
Receiver BITE Tests
Clears memory channels 1-16
(used with 10)
2.4.4.2.2 CLEAR Keypad Switch
The CLEAR key will remove an unterminated numerical entry from the receiver's
internal circuits. Once the terminator is entered, the CLEAR switch does nothing. The CLEAR
switch is also used to release the EXAM mode.
The EXAM mode is used to examine the contents of a memory channel without
changing receiver parameters. During the examination of a memory channel, the front panel
LEDs reflect the contents of the addressed channel, but the receiver's operating parameters
remain as before the examining procedure. Activation of the CLEAR key, during the EXAM
mode releases the EXAM mode and restores the current operating parameters to the front panel
LEDs. Refer to paragraph 2.4.4.7.1 for more details on the EXAM mode.
2.4.4.2.3
Special Function Switch
(*)
The
*
key is a special function key used, in this application, to access the BITE
program mode, to access the Receiver BITE Tests, and to clear all numbered memory channels.
The
*
key also turns turns on/off special operating modes, such as; handoff, master/slave and
dwell.
The
*
key provides access to a Built-In Test Equipment (BITE) program which
provides a diagnostic test of the front panel switches. Because the execution of the program is
software dependent, the program also provides a test of the microprocessor, selected signals,
EPROM, and data lines. The program is accessed by engaging, in order, the 1, 7, and
*
keys.
The immediate effect of the BITE mode is illumination of all front panel LEDs and display of all
segments in each 7-segment display (except the BFa sign).
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