[chirp_devel] DTR/RTS control

[Dean Gibson AE7Q]

On 2013-04-09 19:22, Dean Gibson AE7Q wrote:
>
> ...
>
> For some Icom radios (eg, the ID-880H and IC-2820H) that use the Icom 
> OPC-1529R cable, it's a simple three-wire cable providing ground, TX, 
> and RX.  Presumably these are at RS-232C acceptable levels (that's a 
> whole different discussion).  Other cables (eg, the Yaesu one for the 
> Yaesu FT-897D) have a little circuit board in the RS-232C/DB-9 shell 
> that does level conversion (and needs power, except for the few radios 
> where the cable provides the power).  Still other cables, like the 
> ones that split out TX and RX signals from a single wire, have 
> additional circuitry for that purpose.
>

To see the complexity of this issue, see 
http://www.starrsoft.com/software/win96/cables/gre_cables.htm This cable 
and its internal circuitry (and power) are necessary in order to 
separate out TX from RX in a single-wire (plus ground) radio jack (like 
the IC-7000 has). The cable under discussion works perfectly to 
communicate with the Icom IC-7000 *on my computer*, and when Radio Shack 
was having a close-out sale, I bought four of them (@ $2.00 each).  This 
cable requires DTR high and RTS low in order to work.  Then I found the 
above article, which explains the numerous complaints I have seen on the 
Internet about this cable (and why the price was so low).  Apparently 
there are issues with the cable, and the lower-powered serial ports that 
are commonly found on laptops ...

So, I don't use them any more;  I use the RT Systems CT-29A cable with 
the IC-7000.  The CT-29A works just fine with both DTR and RTS high on 
one serial port I have, but works on *all* of my serial ports with DTR 
*low* and RTS high.
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