[Correcting my earlier comment.]
> You could probably add a diode to make it work.
It takes more than just a diode.
The voltage on the modem control signals is probably too high. You will also
need some way to drop it to what the chip expects, probably 5 volts. Simple
3 pin regulators need
timen...@philipjackson.com said:
> I'm wondering if something like this $10 item
> http://www.nulsom.com/datasheet/NS-RS232_en.pdf
That setup has a separate pin (hole?) for power. It's setup to expect Gnd,
Tx, Rx, and Pwr from the TTL side.
A previous message said the module designed for the
> Or would I need to find an similar device which inverts the incoming logic
> first?
It's not just inversion but also level shifting. Many battery operated devices
run from a dual or even single AA battery. The custom serial adapter shipped
with these units handles the conversion of 1.5 or
I'm wondering if something like this $10 item
http://www.nulsom.com/datasheet/NS-RS232_en.pdf
Would perform the same function as the components in the factory cable once
I've figured the pinout at the clock end, which shouldn't be too hard unless
someone has done that already. Or would I need
The LM-358 Op-Amp is used to Invert the Serial Data (RxD, TxD) stream.
http://www.st.com/content/ccc/resource/technical/document/datasheet/61/46/87/01/98/ed/44/c5/CD0464.pdf/files/CD0464.pdf/jcr:content/translations/en.CD0464.pdf
Coupled with the usage of an RJ11 (4P4C, modular) ...
I thought I could answer this question easily, since I had the cable right
at hand. But my continuity detector gave strange results.
I opened up the D-shell and found a small circuit board with diode,
capacitors and what looks like an ST358 op amp.
Paul Alfille
On Fri, Jul 21, 2017 at 4:27 PM,
