Created Date: December 28,2014

Created by: Lloyd M

If you are replacing an existing alarm panel of that era the existing keypad is likely a single common buss design with 12 distinct switch outputs. 18 VAC sensors from that era are likely do for replacement with current 12VDC versions. DSC.com.... as a starting point...

Most keypads in use today are a 3X4 matrix design. Greyhill.com manufactures both designs. The matrix design will only require seven I/Os but will require you the write scanning routine, but not really alot more complex then the 12/1 buss design. The complex part of keypad routines is the debounce of the switch contact and the inter digit time so that the user does not register multiple digits upon a single press and yet able to easily enter two consecutive digits of the same number.

Created Date: January 13,2015

Created by: captaincutback

Since the matirx type key pad would require an analog input module, I'm now looking at serial. I found a USB type but I have no idea how I'd make it communicate with com port 1 or 2

Here is the keypad.

http://www.google.com/shopping/product/780904060180981873?lsf=seller:6136318,store:5787680215257193760&hl=en&prds=oid:9329232142203604755&sa=X&ei=qDm1VNv0DpHroAS2n4GIAg&ved=0CBYQrhI#sgro=o

Sorry for the duplicate post somewhere else in the forum. I wasn't subscribed to my own thread and I got a little lost.

Created Date: January 13,2015

Created by: captaincutback

If you are replacing an existing alarm panel of that era the existing keypad is likely a single common buss design with 12 distinct switch outputs. 18 VAC sensors from that era are likely do for replacement with current 12VDC versions. DSC.com.... as a starting point...

Most keypads in use today are a 3X4 matrix design. Greyhill.com manufactures both designs. The matrix design will only require seven I/Os but will require you the write scanning routine, but not really alot more complex then the 12/1 buss design. The complex part of keypad routines is the debounce of the switch contact and the inter digit time so that the user does not register multiple digits upon a single press and yet able to easily enter two consecutive digits of the same number.

Thanks Loyd, I'll look into Greyhill though I think at this point the way to do this is serial via the com ports.

Created Date: December 26,2014

Created by: captaincutback

I want to interface a numeric keypad to a Koyo ClickPLC.

I have a C0-00AR-D with 110VAC inputs and relay outputs.

So far, I 've found a keypad with 2 data outputs. This means serial data transmission which complicates my previously simple project.

Are there keypads with parallel data outputs?

Is there a Koyo module that will do serial / parallel / clocking or me?

Is the C0-00AR-D the best module for this application?

I could probably write an input algorithm if I new how the serial data was represented on the 2 keypad data lines but I'd rather not get so involved.

The project:

I am attempting to replace a 1970s era burglar alarm control board with a PLC because the old control board stopped working. The old alarm simply sounded when a door or window opened. It did not tell you which door or window or even which of the 4 monitored loops. The windows and doors appear to be monitored by 18VAC proximity sensors.