Additional modules repowered by the PC4204CX should
have the black, yellow and green Combus wires connected
to the BLK, YEL and GRN Combus Out terminals
respectively.
2.
2.
2.
2.
2. Complete all output wiring.
3.
3.
3.
3.
3. Connect the external tamper switch, if used.
Consult the wiring diagrams for further information.
Current Ratings
In order for the system to operate properly, the power output of the
PC4204CX module cannot be exceeded. The maximum available AUX
supply current is dependent on the size of the transformer used as
well as the selected battery charge current. Use the following chart
to determine the maximum AUX supply current:
Maximum
Maximum
Maximum
Maximum
Maximum AUX Supply Curr
AUX Supply Curr
AUX Supply Curr
AUX Supply Curr
AUX Supply Current
ent
ent
ent
ent
B
B
B
B
B
A
A
A
A
ATTER
TTER
TTER
TTER
TTERY
Y
Y
Y
Y
C
C
C
C
C
HARGE
HARGE
HARGE
HARGE
HARGE
40V
40V
40V
40V
40VA
A
A
A
A
80V
80V
80V
80V
80VA
A
A
A
A
C
C
C
C
C
URRENT
URRENT
URRENT
URRENT
URRENT
T
T
T
T
T
RANSFORMER
RANSFORMER
RANSFORMER
RANSFORMER
RANSFORMER
T
T
T
T
T
RANSFORMER
RANSFORMER
RANSFORMER
RANSFORMER
RANSFORMER
HI-CHRG (800mA)
700mA
2.2A
OFF
HI-CHRG (1.2A)
300mA
1.8A
ON
NOTE: When using the PC4204CX to repower additional Combus modules,
current calculations must be made to ensure that the maximum AUX supply
current is not exceeded.
Module Ratings
The current draw of compatible modules is listed below:
Device
Device
Device
Device
Device
Current Draw (mA)
Current Draw (mA)
Current Draw (mA)
Current Draw (mA)
Current Draw (mA)
Keypad (LCD45XX) .......................................................................... 50
PC4108A Zone Expander ................................................................. 30
PC4116 Zone Expander .................................................................... 30
PC4164 Wireless Receiver .............................................................. 110
PC4701 Fire Module ......................................................................... 35
PC4702BP Dual Bell Output Module ............................................. 75
PC4204CX Relay Output Module ................................................... 30
PC4216 Low Current Output Module ............................................ 15
ESCORT4580 Audio Assistant ....................................................... 150
PC4400 Printer Module .................................................................... 30
PC4820 Access Control Module ...................................................... 35
PC4936 Audio Interface Module ..................................................... 65
PC4401 Serial Interface Module ...................................................... 35
PC4850 Telephone Entry Module ................................................. 135
Calculating Total Current Requirement
Once you have determined which modules will draw power from the
main panel, use the following chart to calculate the Combus current.
Combus Current Calculation Chart
Item
Current (mA)
x
Quantity
Total (mA)
Keypad
50
x
PC4108A*
30
x
Current required for connected devices =
PC4116*
30
x
Current required for connected devices =
PC4164
110
x
PC4701
35
PC4702BP
75
x
PC4204CX
30
x
PC4216*
15
x
Current required for connected devices =
Escort4580
150
PC4400/4401
30/35
x
PC4820
35
x
PC4850
135
x
PC4936*
65
Alt. Comm.
T
T
T
T
Total Combus Curr
otal Combus Curr
otal Combus Curr
otal Combus Curr
otal Combus Current =
ent =
ent =
ent =
ent =
NOTE: * These modules draw current from the Combus to power devices
external to the module. This current must be added to the total Combus
current. See manufacturer’s specifications for the current draw of each
device. Each LED assembly draws up to 20mA of current.
Combus Operation and Wiring
The Combus is used by the control panel and the modules to
communicate with each other. When the PC4204CX is used to repower
and extend the Combus, please refer to the wiring diagram for the
exact wiring procedure.
NOTE: Please follow the diagram exactly.
Modules can be home-run, connected in a daisy chain or T-tapped
anywhere on the Combus.
The following rules MUST be followed when wiring the Combus:
1.
1.
1.
1.
1. The Combus must be run in minimum 22-gauge wire.
2.
2.
2.
2.
2. No module can be more than 1000' (305m) in cable length from
the PC4204CX.
3.
3.
3.
3.
3. Shielded wire should only be used in areas that present excessive
RF noise or electromagnetic interference. If shielded wire is used,
the maximum distance a module can be located from the
PC4204CX is significantly reduced. Check the capacitance rating
of the wire to calculate the maximum distance (see “Capacitance
Limits”).
NOTE: Shielded wire is not recommended.
4.
4.
4.
4.
4. The total capacitance of the Combus wiring must not exceed 80nF
between the control panel and PC4204CX module or between two
PC4204CX modules (see “Capacitance Limits” below).
