Front panel IC-706

Cable pinout

Pin  	Signal 	Color         Description
1 	LRXD 	Yellow        Data transfer from front panel to the radio.
2 	LTXD 	Black         Data transfer from radio to the front panel.
3 	8V 	Blue          DC power (8V) to the front panel.
4 	AF 	Red           Output audio to headphone jacket.
5 	GND 	Shield        Data, power, output audio and power control ground.
6 	MIC 	White         Microphone input.
7 	MICE 	Green shield  Microphone ground.
8 	PWK 	White         Power control (switch ON button). Active in low.

Switch on

Power switch on panel turns PWK signal to low (ground). Radio turns on supply voltage on pin 8V.

Communication

Both sides communicate at 19200 Baud, 8 bits, no parity, 1 stop bit. Protocol is similar to CI-V control. AFAIK it is not published so next informations are taked by reverse-engineering.

• Packet starts with Preamble code (0xfe).
• Second byte is probably Command number.
• Folows Data area with variable length.
• Last byte is End of message code (0xfd).

Commands Panel to Radio

0x01 Buttons 1

Sent state of button group 1. Button state is sent as bitmask in one data byte.

Bit  Mask   Button
0    0x01   F-1
1    0x02   MENU
2    0x04   TUNER/CALL
3    0x08   P.AMP/ATT
4    0x10   RIT/SUB
5    0x20   
6    0x40
7    0x80

Example:

FE 01 04 FD    ; button TUNER/CALL pressed
FE 01 00 FD    ; button TUNER/CALL released

0x02 Buttons 2

Sent state of button group 2.

Bit  Mask   Button
0    0x01   Band down
1    0x02   Band up
2    0x04   TS
3    0x08   MODE
4    0x10   LOCK
5    0x20   DISPLAY
6    0x40   F-3
7    0x80   F-2

0x0b Keepalive

Keepalive packet sent from panel to radio about every 100 ms. When no packet is received by radio in about 200 ms, it switches itself off. To provide reliable work over IP networks, this packet should be emulated.

Example:

FE 0B 00 FD

Commands Radio to Panel

0x60 Display

Data to display on panel. Looks like bitmask controlling particular LCD segments/LEDs. No detailed description available at this time.

References

IC-706