[E3-hacking] pblq 0.3.pre1
dave at webshed.org
Sun Nov 30 17:02:08 GMT 2008
David Given wrote:
> Dave Mills wrote:
>> I've just given this version a try - no joy though. It just sits there
>> "Waiting for device reset..."
>> I am trying to talk to a fresh out of the box E2 with a simple zener
>> diode voltage limiter serial cable. One thing that might be causing
>> problems is my USB>RS232 converter - I shall have to find a laptop with
>> a real serial port to try again.
> Don't forget that the protocol requires the E2 to talk back. RS232 is
>> +3V for logic 0, <-3V for logic 1, and the E2 expects TTL voltages with
> 0V for logic 0 and 5V for logic 1 --- so the sense is inverted with
> respect to RS232. I don't think you can convert in both directions with
> a simple voltage limiter.
> I used a hacked mobile phone cable --- details on my website. I don't
> think that specific model's in production any more, but once you know
> what to look for RS232-TTL converters are reasonably easy to come by.
I'm using the paranoid serial cable from the wiki:
I'll give pblq2 a try again to see if that talks to the E2, with my
setup. It didn't compile with gcc4 when I tried, then I saw your update
was out and didn't try again with pblq2.
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