Should the stright through cable work or do I need a null
modem cable?
Computer is generally DTE. Does the 7800 have a female DE9
RS-232 connector and the computer a male DE9 connector? If
so, a straight through (pin for pin) connection is appropriate.
It should work with connections for only pins 2,3 and 5 ...
make sure Commander and the IC-7800 are set for the same
CI-V address (6Ah default) and the same data communication
rate. DO NOT use the default AUTO in the 7800 - either
9600 or 19200 should work fine. Since only 2,3,5 are used,
Commander's Primary CAT Serial Port (and MultiRadio port if
used) should be 8,N,1, OFF/N, OFF/N ...
73,
... Joe, W4TV
On 2025-03-23 11:07 AM, steve baughn via groups.io wrote:
Good Morning All,
Still trying to get the 7800 wired up right to the pc to get DX Lab working. What I am using from the 7800 to the pc is a db9 straight through cable. In the 7800 manual it says the rs232 jack is wired as a modem (dce). Should the stright through cable work or do I need a null modem cable? Thanks,
Steve, WD8NPL
On 3/22/2025 1:30 PM, Dave AA6YQ wrote:
+ AA6YQ comments below
??? I am running an Icom 7800 which I had hooked up to DX Lab until
??? about a year ago when we moved. I cannot remember for the life of
??? me how I had it hooked up but am thinking a ran an RS-232 cable
??? from the rig to the pc. I cannot get it to run now and am thinking
??? perhaps I do not have the right cable. Can someone please advise
??? this OM?
+ You must connect a COM port on your computer to an Icom CI-V interface, which is in turn connected to the Remote jack on the backpanel of your IC-7800. You can build or buy the CI-V interface; see
+ If you have additional questions, don't hesitate to post them here.
? ? ? ? 73,
? ? ? ? ? ? ? ? Dave, AA6YQ
