Bus; Bus Cables; Bus Branching And Splitting; Example Of Calculation Of Bus Consumption To Back-Up The System - jablotron JA-10 Series Manual

5.1 JA-10 BUS
The BUS of the JA-10 system consists of four wires (4-wire). The BUS cannot be shared with another system
not even to power different devices.
BUS terminal board

5.2 BUS cables

Resistance of the pair of power supply wires (there and back)
CC-02
Connect BUS devices using CC-02 cable or equivalent.
CC-02 cable has 4 wires (the colours correspond to the BUS colour). All the wires of the CC-02 cable have the
same core cross-section (0.2 mm²). The cable is supplied in packs per 300 m.
BUS layout:
The BUS cable must not be connected in such a way to create a closed loop of any wire (the ends of individual
branches must never be interconnected and the common GND wire must not be interconnected either.

5.3 BUS branching and splitting

The maximum length of one BUS is 500 m. The length is calculated as the sum of the length of all the cables
between all the connected devices. The number of connected BUS devices is limited by the capacity of the
backup battery of the control panel. To meet the standard for security grade 2, in case of a 230 V mains failure
the system must reliably work for at least 12 hours being powered by the backup source. Thus, the total
consumption of all the BUS devices must not exceed the maximum continuous consumption of current from the
control panel. To calculate the total continuous consumption of connected elements summarize their backup
consumption (it is specified in the manual or use the summarizing table, see 14.1 Overview table of current
consumption of BUS devices.
Another limiting parameter for the max. length of a BUS can be the voltage loss along the line (shown clearly by
the System Diagnostics in N-Link).

5.4 Example of calculation of BUS consumption to back-up the system

The table presents an example of a small system with 5 BUS devices. The total idle consumption in the backup
mode is 78 mA. Thus you can use the JA-14K(R) control panel, which enables maximum permanent loading of
125 mA and 85 mA when the LAN module is enabled.
Tab. 5
Device Description
JA-111R Module for radio communication
JA-10E Control keypad
JA-10A Internal siren 5 mA
JA-11A RB External backed-up siren 5 mA
JB-110N PG output module
JA-14K(R) Security System Control Panel
terminal colour note
+U red positive power supply terminal; it can only be
used to supply devices of the JA-10 series
A yellow data A
B green data B
GND black common terminal (negative power supply terminal)
resistance of the pair per 1 m
resistance of the pair per 10 m
resistance of the pair per 100 m
No. of pieces
15 / 72
0.1932 Ω
1.932 Ω
19.32 Ω
Consumption in backup mode
1 25 mA
1 18 mA
1
1
1 25 mA
TOTAL 78 mA
5 mA
5 mA
MNX22101