[Icom] IC-775DSP and CI-V Question

Thu, 20 Mar 2003 11:50:06 -0800

Correct. The CI-V command set does NOT include a command to toggle the rig=
=20
between transmit and receive. A separate signal has to be sent via the PC=20
port to do this.

Just to make sure I wasn't blowing blue smoke, I checked Ekki's excellent=20
CI-V document and this was confirmed.

73 - Larry W=D8NFU
[email protected]

At 02:42 PM 3/20/2003 -0500, you wrote:

>You are correct, the 775's CI-V command repetoire does not include PTT
>on/off. Commander can be configured to PTT your 775 via a one transistor
>circuit attached to the DTR or RTS signal of the same serial port that
>drives your CI-V interface; since your interface is homebrew, it should
>be quite easy to add this circuit, particularly if the RS232 cable
>connecting your PC serial port to your interface includes a conductor
>for DTR or RTS.
>
>Some of the newer Icom transceivers can be keyed over the CI-V
>interface, but not the 775.
>
>     73,
>
>          Dave, AA6YQ (author, Commander)
>
>-----Original Message-----
>From: [email protected] [mailto:[email protected]] On
>Behalf Of Jim Bennett
>Sent: Thursday, March 20, 2003 2:08 PM
>To: [email protected]
>Subject: [Icom] IC-775DSP and CI-V Question
>
>
>Larry,
>
>You had said "...The CI-V interface only translates the RS-232 (+12/-12)
>signals to/from a state (TTL) which is compatible with the Icom
>equipment."
>
>I thought that software packages (such as CI-V Commander, MixW,
>WriteLOG,
>etc.) passed hex/ASCII commands back and forth through this interface
>unit, and the radio then responds to responds to a set of those
>commands. For example, the MixW digital communications program says
>"What's the current frequency?", the radio responds, and the program
>displays it on the screen. Similarly, if the radio's mode switch is
>changed or the sub-vfo is turned on, that info is passed back to the
>software, through the CI-V interface, and the info is displayed on the
>screen. True, the interface is pretty much a "passive" device here, but
>what I don't understand is why the radio doesn't respond to the
>hex/ASCII command code to go to TRANSMIT. The manual that comes with the
>'775 lists some command codes, and TX on/off isn't one of them. That's
>why I'm wondering if, in fact, the '775 doesn't have the smarts to know
>about TX on/off through the CI-V. Hmmm... maybe a good reason to upgrade
>to a new rig... =3D)
>
>Jim / W6JHB
>
>
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