Mattylad
Posts: 98
Joined: Tue Jan 17, 2012 9:59 pm

Interfacing to a PCLD-785B ?

Tue Jun 26, 2012 8:51 pm

HI, while rooting through my junk I have found one of these:
http://www.ucs.co.uk/pdf/PCLD-785.pdf
Manual = http://downloadt.advantech.com/ProductF ... D-785B.pdf

It is basically a 24 channel relay board that uses a 5V/TTL control logic.

How would I drive this using the Pi?
I.E. Is the Pi output 3v3 requiring a level shifter? If so what is the simplest way of achieving this?

Cheers.
M

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TonyD
Posts: 439
Joined: Thu Sep 08, 2011 10:58 am
Location: Newcastle, UK
Contact: Website

Re: Interfacing to a PCLD-785B ?

Wed Jun 27, 2012 11:55 am

The RPi only has 17 GPIO pins, so you'll only be able to control up to 17 relays from the 24 on the card. Unless you want to use a couple of I/O Port Expanders or a make a 24-ch serial-parallel I/F (using 3x 74HC595s).

Myself I would use 2x ULN2803 wired to 16 GPIO's of the RPi. Check out Grumpy_Mike Buffer Board or my MiniPiio_ULN2803.
Tony

Mattylad
Posts: 98
Joined: Tue Jan 17, 2012 9:59 pm

Re: Interfacing to a PCLD-785B ?

Wed Jun 27, 2012 5:44 pm

Cheers.

It will likely go back down in the cellar for another 6 months before I can look at it again. :)

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