3.1 Icom CI-V Bus Adressing

Each message (frame) sent to a rig or received from a rig contains two adresses. The destination (to-adress) and the sender (from-adress). Each model has it's own default CI-V adress, which can be changed by the user. If two or more rigs of the same model are used on the bus (or level converter), you need to change the adresses of the rigs, each individual rig must have it's own, distinct adress.

The 'Icom CI-V Reference Manual (3rd edition)' from 1991 specified the adress range from $01 to $7F. That range was exhausted in 2010 with the IC-9100. But Icom has been happily using addresses above the originally specified range without any issue. Now (2019) we are at address $98 (IC-7610). With a rate of 1 to 2 new rigs per year that leaves room until 2036 or so :). But then there are the odd addresses which haven't been used at all in amateur radio products. Values $FA to $FF are reserved for special protocol functions.

To-adress is the 3rd byte in a frame, from-adress the 4th byte.
$FE $FE to-adr fm-adr Cmd Sub Data Data $FD

There are some reserved adresses with special meaning:

Default adresses

Each Icom model has it's own, distinct default adress. As a general rule, Icom used only even adresses ($02, $04, $06 ...). Each model was given a new default adress when it came out. The user can change the default adress if required. On older rigs this was done by (re-) soldering some diodes, on newer rigs the adress can be changed by setup through the front panel or even by CI-V commands. Adresses can be selected from $01 to $EF, giving 239 distinct adresses.

The following is a nearly complete table of all known adresses from CI-V capable rigs, not only by Icom.

Icom-Model Addr Memories Bandedge Type
IC-271 $20 32 1,2 VHF Allmode
IC-275 $10 99+3 P1,P2 VHF Allmode
IC-375 $12 99+3 P1, P2 220MHz Allmode
IC-471 $22 32 1,2 UHF Allmode
IC-475 $14 99+3 P1,P2 UHF Allmode
IC-575 $16 99+2 P1,P2 10m & 6m Allmode
IC-7000 $70 500+2 6 HF/VHF/UHF Allmode
IC-703 $68 99+2 P1, P2 HF Allmode QRP
IC-706 $48 99+3 P1, P2 HF/VHF Allmode
IC-706MkII $4E 99+3 P1, P2 HF/VHF Allmode
IC-706MkIIG $58 99+3 P1, P2 HF/VHF/UHF Allmode
IC-707 $3e ? ? HF Allmode
IC-718 $5E 99+2 ? HF Allmode
IC-7100 $88 100 P1,P2 HF+VHF Allmode, mobile, D-Star
IC-7200 $76 200 P1,P2 HF Allmode
IC-725 $28 26 25,26 HF Allmode
IC-726 $30 24+2 P1, P2 HF/6m Allmode
IC-728 $38 26 25, 26 HF Allmode
IC-729 $3A 26 25, 26 HF/6m Allmode
IC-735 $04 12 11,12 HF Allmode
IC-736 $40 ? ? HF/6m Allmode
IC-737 $3C 99+3 P1, P2 HF Allmode
IC-738 $44 ? ? HF Allmode
IC-7300 $94 100 P1,P2 HF Allmode (SDR)
IC-7400 (IC-746Pro) $66 99+2 P1, P2 HF/VHF Allmode
IC-7410 $80 100 P1, P2 HF Allmode
IC-746 $56 99+2 P1, P2 HF/VHF Allmode
IC-751A $1C 32 1,2 HF Allmode
IC-756 $50 99+2 P1, P2 HF/6m Allmode
IC-756Pro $5C 99+2 P1, P2 HF/6m Allmode
IC-756ProII $64 99+2 P1, P2 HF/6m Allmode
IC-756ProIII $6e 99+2 P1, P2 HF/6m Allmode
IC-761 $1E ? P1, P2 HF Allmode
IC-765 $2C 99+2 P1, P2 HF Allmode
IC-775 $46 99+2 P1, P2 HF Allmode
IC-7600 $7A 100 P1, P2 HF Allmode
IC-7610 $98 100 P1, P2 HF Allmode (SDR)
IC-7700 $74 100 P1, P2 HF Allmode Contest
IC-78 $62 ? ? HF Allmode
IC-7800 $6A 99 P1, P2 HF Allmode
IC-7850/51 $8E 100 P1,P2 HF Allmode
IC-781 $26 99+2 P1, P2 HF Allmode
IC-820 $42 2x80+3 P1, P2 VHF/UHF Allmode
IC-821 $4C 2x80+3 P1, P2 VHF/UHF Allmode
IC-910 $60 2x100 + 1 2 x 6 VHF/UHF Allmode
IC-9100 $7C 100 P1, P2 HF+VHF Allmode, Sat, D-Star
IC-970 $2E 99+3 P1, P2 VHF/UHF Allmode
IC-9700 $A2 VHF/UHF Allmode, SDR, Sat, D-Star
IC-1271 $24 32 1,2 SHF
IC-1275 $18 32+3 P1, P2 SHF
IC-R10 $52 ? ? Handheld scanner
IC-R20 $6C 1000+200 50 Handheld scanner
IC-R71 $1A 32 ? General Coverage Receiver
IC-R72 $32 101 ? General Coverage Receiver
IC-R75 $5A 100 P1, P2 General Coverage Receiver
IC-R7000 $08 ? ? General Coverage Receiver
IC-R7100 $34 99 10xP1,P2 General Coverage Receiver
IC-R8500 $4A 800 n/a Gen.Cov.RX
IC-R8600 $96 1200 n/a Gen.Cov.RX
IC-R9000 $2A 99 10xP1, P2 General Coverage Receiver
IC-R9500 $72 1000 Auto: 100, Skip: 100, Scanedge: 20 General Coverage Receiver
IC-RX7 $78 1600 Organized by Category, Group etc. Handheld Scanner
Controller/PC $E0 - -  
Mini Scout $94 - - Optoelectronics Mini Scout freq. counter
Optoscan 456/535 $80 - - Optoelectronics Optoscan
ID-1 $01 - - JARL 23cm digital data/voice radio
ID-4100 $9A VHF/UHF FM/D-STar Mobile
ID-51 $86 VHF/UHF FM/D-STar Handheld
FC-3002 $58 - - ACECO FC-3002 counter

Thanks to John, Trevor, Dave, John, Sergey, Mark, Don, Stephane, Robin and others who helped completing this table.

The same list, sorted by adresses. Since Icom assigned adresses in an ascending order when new radios came out, it gives a historical overview of the rigs appearance on the market (mostly, with some irregularities and gaps). This list shows only Icom rigs, not those of other vendors capable of the CI-V protocol. The years when the rigs appeared on the market are from my memory, info gathered at work or from www.rigpix.com (tnx!).

Icom Model CI-V Address Year to market
IC-735 $04 1985
? $06 ?
IC-R7000 $08 1986
IC-275 $10 1987
IC-375 $12 198?
IC-475 $14 1987
IC-575 $16 198?
IC-1275 $18 198?
IC-R71 $1A 1984
IC-751A $1C 1985
IC-761 $1E 1987
IC-271 $20 1983
IC-471 $22 1984
IC-1271 $24 1987
IC-781 $26 1987
IC-725 $28 1988
IC-R9000 $2A 1989
IC-765 $2C 198?
IC-970 $2E 1990
IC-726 $30 1989
IC-R72 $32 1992
IC-R7100 $34 1991
? $36 ?
IC-728 $38 1992
IC-729 $3A 1992
IC-737 $3C 1993
IC-707 $3E 1993
IC-736 $40 19??
IC-820 $42 1994
IC-738 $44 1994
IC-775 $46 1995
IC-706 $48 1995
IC-R8500 $4A 1996
IC-821 $4C 1996
IC-706MkII $4E 1997
IC-756 $50 1997
IC-R10 $52 1996
? $54 ?
IC-746 $56 1998
IC-706MkII-G $58 1998
IC-R75 $5A 1999
IC-756Pro $5C 2000
IC-718 $5E 2001
IC-910 $60 2001
IC-78 $62 2000
IC-756ProII $64 2001
IC-746Pro $66 2001
IC-703 $68 2003
IC-7800 $6A 2004
IC-R20 $6C 2004
IC-756ProIII $6E 2004
IC-7000 $70 2005
IC-R9500 $72 2007
IC-7700 $74 2007
IC-7200 $76 2007
IC-RX7 $78 2007
IC-7600 $7A 2009
IC-9100 $7C 2010
? $7E
IC-7410 $80 2011
? $82
? $84
ID-51 $86 2012
IC-7100 $88 2012
? $8A
? $8C
IC-7850/51 $8E 2015
? $90
? $92
IC-7300 $94 2016
IC-R8600 $96 2017
IC-7610 $98 2017
ID-4100 $9A 2017
IC-9700 A2 2019