British Rail AWS Sunflower
I purchased an AWS Sunflower from Ebay a while back, not for
any other reason than the fact that I wanted to own part of
a class 50 locomotive. The Sunflower came from a Class 50
scrapped at Old Oak Common in the late 80s.
The Sunflower has 5 contacts on the back, numbered 1 - 5.
After a little playing about with a 12v Power supply, the
wiring seems to be:
(As viewed from the back)
___ ___ | ___ | ___ ___
5 4 3 2 1
SWITCH RESET GND SET
Momentarily putting a 12v supply onto GND and SET turns
the AWS display to the yellow/black aspect and completes
a circuit between contacts 4 and 5. Putting a momentary 12v
supply between GND and RESET sets the AWS aspect to solid
black and breaks the circuit between contacts 4 and 5.