Midland Syn-Tech III P25 - Table 3-2: KN2, RF and Control PCB to Display and Keypad PCB Signals

SYN-TECH III P25 PORTABLE RADIO
SERVICE MANUAL
3-7
Table 3-2: KN2, RF and Control PCB to Display and Keypad PCB Signals
POSITION DEFINITION FUNCTION
KN2-1 RS232_CTS RS232 CTS signal
KN2-2 REG3V3 Regulated 3V3 voltage that supplies front panel
KN2-3 RS232_RTS RS232 RTS signal
KN2-4 ON_OFF Data received from front panel On_Off Switch
KN2-5 RS232_RX RS232 receive data
KN2-6 EXT_PTT External Push To Talk data
KN2-7 RS232_TX RS232 transmission signal
KN2-8 EMERGENCY Emergency call data
KN2-9 LCD_CS LCD Select data that goes to front panel
KN2-10 GND Ground
KN2-11 SSP_BUSY_MAX7301_CS Multiplexer at the front panel select data
KN2-12 CLEAR Clear key data
KN2-13 FRONT_SERI_REPLY Serial data received from multiplexer at the front panel
KN2-14 EXT_MIC_SENSE Senses when an external microphone is attached
KN2-15 FRONT_SERI_DATA Serial data that goes to front panel
KN2-16 FLAT_AUDIO Audio signal received from front panel for test/adjustment
KN2-17 FP_SERI_CLOCK Serial data signal that goes to the front panel
KN2-18 LCD_TEMP_RD Analog LCD temperature data
KN2-19 SENSE_RETURN Sense return signal
KN2-20 SENSE Sense signal
KN2-21 AUDIO_POT_H Receive audio signal that goes to audio pot
KN2-22 SW7V5 Switched 7.5V battery voltage
KN2-23 I_O_IRQ Interrupt data received from front panel
KN2-24 MIC_AUDIO Microphone audio signal received from front panel