TK-218039Display unit (X54-3470-XX)Pin No. Name I/O Function1 SW2 O Key matrix output (Side2 key)2 K1 I Key matrix input (Side key)3 GND - GND4 PTT I PTT input5 SW1 O Key matrix output (Side1 key)1 NC - Non connection2 V5 O LCD driving voltage output3 Vss - GND4 V5OUT I Step up voltage input5 C2- - Step up capacitor connecting terminal6 C2+ - Step up capacitor connecting terminal7 C1- - Step up capacitor connecting terminal8 C1+ - Step up capacitor connecting terminal9 Vci O Voltage converter power supply output10 VDD O LCD power supply output11 OSC1 - Non connection12 OSC2 - Non connection13 RESET O LCD reset output14 P/S O GND15 RS O Register select output16 R/W O GND17 SCL O Serial clock output18 SIO O Serial data output19 CS O Chip select output20 Vss -1 NC - Non connection2 NC - Non connection3 NC - Non connection4 LCDRS I LCD RS input5 AGND - GND6 ME - Internal microphone ground7 MIC O Internal microphone output8 PTT O PTT output9 SPSTB I Shift register storage enable input10 CLK I Serial clock input11 DATA I Serial data input12 KI1 O Key matrix 1 output13 KI2 O Key matrix 2 outputPin No. Name I/O Function14 NC - Non connection15 SB2 I Power input after power switch16 NC - Non connection17 DGND - GND18 LCDCS I LCD chip select input19 LCDRST I LCD reset input20 5M I 5VTX-RX unit (X57-6930-10)Pin No. Name I/O Function1 SB1 I Power input after power switch2 +B O Power output after passing through the fuse3 EN3 I Encoder pulse input4 EN4 I Encoder pulse input5 DGND - GND6 EN2 I Encoder pulse input7 EN1 I Encoder pulse input8 DGND - GND9 VOL I Volume level input for audio control10 5M O 5V1 5M O 5V2 LCDRST O LCD reset output3 LCDCS O LCD chip select output4 DGND - GND5 NC - Non connection6 SB2 O Power output after power switch7 NC - Non connection8 KI2 I Key matrix 2 input9 KI1 I Key matrix 1 input10 DATA O Serial data output11 CLK O Serial clock output12 SPSTB O Shift register storage enable output13 PTT I PTT input14 MIC I Internal microphone input15 ME - Internal microphone ground16 AGND - GND17 LCDRS O LCD RS output18 NC - Non connection19 NC - Non connection20 NC - Non connectionTERMINAL FUNCTIONCN507CN508CN509CN400CN500