Hello, I am trying to wire up an SD1 dialler. The only part I am not 100% sure of is wiring it to the panels comms port. The panel removes 5 volts positive in alarm. So if I set the SD1

Old SD1? - 12v only

remember though it`s looking for the change so you`ll not cause damage

"So if I set the SD1

the SD1 can be set to + or - triggered inputs (can't remember but i there is i think a link/s)

you will need to fit a 'pull down' bias resistor of 2.2k between negative (-) 12 volts and the input you using, do the same fore the other imputs with individual resistors.

if your panel is 'removing' a strong positive but not actually applying a true negative, the SD1 needs a decent square wave to operate satisfactory so the ressistor applies enough negative to do this.

regs

alan

the SD1 can be set to + or - triggered inputs (can't remember but i there is i think a link/s)

you will need to fit a 'pull down' bias resistor of 2.2k between negative (-) 12 volts and the input you using, do the same fore the other imputs with individual resistors.

if your panel is 'removing' a strong positive but not actually applying a true negative, the SD1 needs a decent square wave to operate satisfactory so the ressistor applies enough negative to do this.

regs

alan

Simply put the removal of 12V + to 0v is not negative, just zero, the old menvier dialers needed a true negative signal to work as I found out.....

Just out of interest, why use an SD1 when you can use an SD2 that has much better facilities and alarm logging etc.....??

Old SD1? - 12v only

remember though it`s looking for the change so you`ll not cause damage

"So if I set the SD1’s trigger polarity to negative will it be ok or will it damage the SD1? Since if the SD1 is expecting a negative supply on the trigger inputs when it gets a positive supply because the alarm has not been triggered" - thats how they work

It’s the old SD1. The spec I have found says "Trigger inputs A, B, C +ve or –ve applied, max 24V". I was thinking that it was only looking for a change but wanted to be on the safe side.

the SD1 can be set to + or - triggered inputs (can't remember but i there is i think a link/s)

you will need to fit a 'pull down' bias resistor of 2.2k between negative (-) 12 volts and the input you using, do the same fore the other imputs with individual resistors.

if your panel is 'removing' a strong positive but not actually applying a true negative, the SD1 needs a decent square wave to operate satisfactory so the ressistor applies enough negative to do this.

regs

alan

In the manual I have which is not the SD1's manual but the old SD1+ its says a 1k resistor. So is the 2.2k resistor still ok then?

I will be passing Maplins tomorrow so I just ask for a 2.2k resistor. Is this one ok Code: D2K2, 2W Res 2K2?

I think what happens is the panel does not apply a negative it just removes the positive 5 voltages.

Just out of interest, why use an SD1 when you can use an SD2 that has much better facilities and alarm logging etc.....??

I know the newer diallers are better like having more features. This dialler is not very old. I can’t remember but I don’t think it was installed for very long. It was put in a safe place, which was forgotten about. I was thinking about buying a newer one but I knew I had this one.

Thankyou

djrock

Edited November 14, 200718 yr by djrock

Or just fire it off the bell ( forget what this lot are bound to say next)

Or just fire it off the bell ( forget what this lot are bound to say next)

I know I can trigger it off the bell output but I wanted to try and use the panels comm port if I can.

Thankyou

djrock

I know I can trigger it off the bell output but I wanted to try and use the panels comm port if I can.

Thankyou

djrock

what panel is it? does it have a relay board available?

Hello, I don't think it can take a relay board. So is it not possible to do it arfur mo's way?

djrock