Re: Can I interface the NSLU2 to an EIA-485 bus?
- --- In email@example.com, "Anssi Porttikivi" <app@...> wrote:
>You could also connect a TTL to RS-485 transceiver chip to the onboard
> If I have some home automation equipment that is controlled via a
> proprietary protocol on top of serial EIA-485 (RS-485) bus, can I do a
> hardware hack to the NSLU2 to interface to that? I am actually
> planning a commercial product based on this, and we have some
> resources to buid it, if it makes sense.
> Or does anyone have any ideas of another cheap, general purpose, easy
> to program platoform for controlling home automation?
serial port on the NSLU2. That would be a pretty good option, as it
would let you use the NSLU2 to prototype your code, and then switch to
a different platform when the concept is closer to production.
Warning: at least on my NSLU2 units, the boot loader listens for
traffic on the serial port at startup. As such, with a half-duplex
serial connection, the NSLU2 will hear its own traffic and abort the
boot process. You will need to gate Rx inputs to the slug to a
disabled (low) state for the first section of the boot process. This
is easy enough to do, if you know to do it.