Chapter 9: Important Notes On Connections; 470 Ohm Resistor; Notes On Wiring Extra Devices; Resistor Values - Pyronix PCX-256 Installation Manual

P C X 2 5 6 I N S T A L L A T I O N M A N U A L
C H A P T E R 9 : I M P O R T A N T N O T E S O N C O N N E C T I O N S
Some devices may carry different idents, therefore please note the following:
9 . 1 4 7 0 o h m r e s i s t o r
On each of the below diagrams, it shows that each device has a 470ohm resistor connected
across the data lines of each device.
We recommend that this resistor is in place on wiring connections over 300 metres; it is there to
balance the data (long distances can make the data communication become unstable).
On wiring connections below 300 metres you don't need the 470ohm resistor connected, but it will
not do any harm in installing it anyway.
9 . 2 N o t e s o n w i r i n g e x t r a d e v i c e s
Each device can be wired in series from the PCX end station. However, it is recommended that
you connect the keypad as the first device at all times, as this is what the PCX searches for on
initial power up (keypad address 00), all other devices are ignored until they are assigned in the
engineer menu.
9 . 3 R e s i s t o r V a l u e s
The resistor values are recognised as follows:
The PCX System recognises the following:
Page: 30
Meanings
0V =
+12V =
Data Bus A =
Data Bus B =
4k7 resistor = Yellow/Violet/Red
6k8 resistor = Blue/Grey/Red
470Ω resistor = Yellow/Violet/Brown
4k7: Alarm
4k7: Tamper
6k8: Mask/Fault
Terminals
K- or D1
K+ or D2
A or D3
B or D4
RINS869-8