Based on the recommendations here I created the equivalent of
a 3-wire null modem cable (think of it as a null modem adapter
in-line with a straight-thru cable).
The two cables together are functionally the equivalent of either
a single null modem cable, or the equivalent of a straight-thru
cable with a null modem adapter.
QUESTION1: If you had a straight-thru cable and added a null
modem adapter, would you place the adapter at the Tracker2/OT2M
end or the PC end - or does it matter?
DETAIL: Does the laptop need to interface with Pin 2 as Pin 2
even though at some point along the cable it becomes Pin 3 at
the Tracker2/OT2M, and Pin 3 as Pins 3 even thought it becomes
Pin 2 even though at some point along the cable it becomes Pin 2
at the Tracker2/OT2M? (My instinct says it should not matter.)
QUESTION2: Is there any good reason to believe that the handshaking
wiring shown on the tracker2 Yahoo site - only at the PC end - will
make a difference - or is it "who knows, try it and see if it works"?
> On Sun, Jul 3, 2011 at 10:52 AM, doc@...<doc@...> wrote:
>> The DB-9 connector on the back of the Tracker2/OT2M is Male,
>> the DB-9 connector on the back of the laptop is Male,
> I can't remember the T2 pinout, but _in_general_ : if the two RS232
> devices have complementary genders (one female, one male) they need a
> straight-through cable. A standard straight-through serial cable has
> a male connector on one end and a female on the other.
> If you think you need a gender changer, you probably really need a
> null modem cable. There are exceptions to this, e.g. the kenwood D700
> serial connector, which is an engineering screwup and you do need a
> gender changer to use a standard cable.
Thanks! & 73, KD4E
David Colburn http://kd4e.com
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