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Pin numbers on RJ45 and DB-9 are the same
1 or/w 1 wire bus
2 or GND
3 g/w uSwitch (short to gound to indicate valve open)
4 bl 5V
5 bl/w 24V
6 g uSwitch
7 br/w coil - plc pulls to ground to open valve
8 br coil
(doubling up is to make wirign in plc neater)
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