Valhalla Scientific 4300C, Operation Manual

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KEY? QUERY
Returns the decimal number of the key last key processed by the state machine. This
query returns any key in the remote mode even if the key is locked out by remote mode,
i.e. KEY_LOCAL is not locked out.
Syntax: KEY?<crlf>
21<crlf>
Response: Decimal Key value between 0-24, 0 = No key pressed
0 KEY_NO_KEY
1 KEY_0
2 KEY_3
3 KEY_CLEAR
4 KEY_9
5 KEY_LOCAL
6 KEY_RESET
7 KEY_FUNC
8 KEY_ENTER
9 KEY_DP
10 KEY_RANGE_4
11 KEY_2
12 KEY_RANGE_5
13 KEY_5
14 KEY_RANGE_6
15 KEY_8
16 KEY_6
17 KEY_NOTUSED
18 KEY_RANGE_2
19 KEY_1
20 KEY_RANGE_1
21 KEY_4
22 KEY_RANGE_0
23 KEY_7
24 KEY_RANGE_3
KEY_UPDATE KEY_1
KEY_HLC KEY_2
KEY_ADDR KEY_3
KEY_RUNHOLD KEY_4
KEY_PRINT KEY_5
KEY_TCM KEY_6
KEY_AUTO_RNG KEY_7
KEY_CAL KEY_8
KEY_BCD KEY_9
KEY_VIEW KEY_0
KEY_DISPLAY KEY_1
KEY_mk KEY_DP
Usage: Keys are polled every 25ms in a timer interrupt. This routine changes mode to local
and responds with the last key pressed. It can sense keys even in remote mode. Keys are
debounced but are not tested for each menu state.
In other words, sending KEY 4 in a state that does not accept that key will have no effect
to change the state. In addition if the KEY X commands are sent without enough interval
the key handler task will not have executed and the key press can be overwritten by the
next key command and the previous one is skipped. This is due to no buffering of remote
key presses.