2-6
3-4 Local Key Assignment
1. Detection method of Local Key
Detection method of Local Key in N4ES chassis is analogue way to detect what voltage appears at local key input terminals
(pins 13, 14) of Micom when the key is pressed.
By this method, key detections of a maximum of 7 keys can be done, using local key input terminal (pin 13). As seen in the Local
key circuit below, when one of key among S13-1 to S13-7 is pressed, the VIN which corresponds to the switch is applied to input
terminal (pin 13). Judgement of key-input is done by measuring what voltage VIN is at the pin. Voltage measuring and key
judgement are performed by A/D converter in Micom and by the software.
KEY No. Function
S13-1 POWER
S13-2 CH UP
S13-3 CH DN
S13-4 VOL UP
S13-5 VOL DN
S13-6 ADV
S13-7 MENU
S14-1 RGB/TV/VIDEO
LOCAL KEY Assignment table
33K
KEY1
KEY2
33K
7.5K
7.5K
11K
16K
30K
68K
S13-7
S13-6
S13-5
S13-4
S13-3
S13-2
S13-1 S14-1
13 14
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