Furuno FS-1503 Service Manual page 15

U6: I/O Port IN/OUT
P15 IN
P16 IN
P12 IN
P73 IN
P74 IN
P75 IN
P90 OUT
P91 OUT
P95 OUT
P96 IN
P10 IN
P11 IN
P50 OUT
P51 OUT
P52 OUT
P53 OUT
P54 OUT
P55 OUT
P56 OUT
P57 OUT
P60 IN
P61 OUT
P62 OUT
P63 OUT
P20 IN
P21 IN
P22 IN
P23 IN
P70 OUT
P71 OUT
P72 OUT
P14 IN/OUT
P13 OUT
Function (Signal name)
TX KEY
BUSY (TUNE OK)
PTT
RX MUTE
UNLOCK
SQ SIG
DDS DATA
DDS CLK
TXD
RXD
UP
DOWN
D0
D1
D2
D3
D4
D5
D6
D7
READY
CS
WE
SYNC
S1 to S4
S5 to S8
S9 to S12
S13 to S16
DIM
DIM
DIM
S-DATA
S-CLK
2-8
Description
Remote terminal TX signal, TX: L
Busy signal from ant. coupler
PTT signal, ON: L
MUTE signal from CONTROL terminal
PLL unlock, unlock: L
Squelch ON/OFF signal
DDS shift register serial data
DDS shift register clock
Data to remote terminal
Data from remote terminal
Freq./channel up signal
Freq./channel down signal
LCD data, key scan
LCD data, key scan
LCD data, key scan
LCD data, key scan
LCD data
LCD data
LCD data
LCD data
LCD control
LCD control
LCD control
LCD control
Scan input
Scan input
Scan input
Scan input
LCD, KEY illumination
LCD, KEY illumination
LCD, KEY illumination
Serial data input/output
EE-ROM clock