Printer/Fax/Scanner/Copier manual KX-FT21RS

6.11.2. SENSOR DETECTION
When CN1(8) (OPSEL) is "L", the detection of the document sensor and read start position sensor are available.
6.11.3. LCD CONTROL
"KTXD", "KSCLK", "KLATCH" and "KSTART" are sent as D4~D7 to control the LCD.
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KX-FT21RS