Port Allocations - Icom IC-M400BB Service Manual

4-5 PORT ALLOCATIONS

• CPU (LOGIC UNIT: IC1)
PIN LINE
No. NAME
26 TEMPV Temperature sensing voltage.
27 TDETV Transmit output power sensing voltage.
28 LOINV Lock voltage input.
29 WDECV Weather alert signal detect.
40 DSCOUT DSC signal encoding output.
41 BEEP Beep audio. (Square waves)
44 NOISEV Noise level detect.
46 LBAT Power supply voltage.
58 SDATA Common serial data.
59 SCK Common serial clock.
D/A converter (MAIN UNIT: IC514)
63 DASTB
strobe.
64 PLSTB PLL (MAIN UNIT: IC101) strobe.
Expander (MAIN UNIT: IC801 and
65 IOSTB
IC802) strobe.
Serial data to the COMMANDMI-
69 COM1TXD
CIV™.
Serial data from the COMMANDMI-
70 COM1RXD
CIV™.
RX AF mute switch (MAIN UNIT:
IC504) control. (For COMMANDMI-
77 REXTM
CIV™)
L=AF mute.
RX AF mute switch (MAIN UNIT:
78 RXSPM IC504) control. (For public address)
L=AF mute.
101 NM1TXD NMEA output.
102 NM1RXD NMEA input.
103 DSCIN Decoded DSC signal input.
113 CLOTXD Cloning data.
114 DTEST DSC loop back testing signal.
116 CLORXD Cloning data.
Power supply line VCC control.
117 PON
L=While the transceiver's power is ON.
PLL unlock detect.
135 UNLKI
L=Unlocked.
136 DIMM LCD brightness control.
EEPROM (LOGIC UNIT: IC9) serial
141 ECK
clock.
EEPROM (LOGIC UNIT: IC9) serial
142 EDATA
data.
• D/A CONVERTER (MAIN UNIT: IC514)
PIN LINE
No. NAME
2 AFVOLO AF output level adjustment. (RX signal)
3 FCON Reference frequency adjustment.
11 SQL Noise squelch level adjustment.
14 MSENS MIC sensitivity adjustment.
15 PCON TX output power adjustment.
AF output level adjustment. (Public ad-
23 PAVOLO
dress signal)
DESCRIPTION
DESCRIPTION
I/O
I
I
I
I
O
O
I
I
I
I
I
I
I
O
I
O
O
O
I
I
O
O
I
O
I
O
O
I/O
4-5