Product Manuals/Man-1088_Sigma XT_26 Page 20 of 40
14. Connection and configuration of status units and ancillary boards
The control panel should not be powered during the connection of status units or ancillary
boards.
Status units and ancillary boards require a four-wire connection from the panel, which drops into
each unit and connects to the corresponding data and power, in and out terminals. Two of the
cables carry power to the units (24V) and the other two carry data. A four core cable suitable for
carrying RS485 data should be used. If this is a twisted pair cable then one twisted pair should be
used for the data connections and the second pair used for the power connections
Each status unit has a 3-bit DIL switch and must be allocated a unique address between 1 and 7.
Each ancillary board has a 3-bit DIL switch and must be allocated a unique address between 1
and 7.
The address switch is located on the bottom left
hand corner of the status unit or ancillary board
PCB. Note: The address is only read when the
boards are first powered so address switches
should not be altered on a system that has power
applied.
If a double address occurs on the system then
the system will illuminate the General fault and
Hold indicators and the buzzer will sound.
The panel display will show the status unit or
ancillary boards that have the same address.
14.1 Adding new status units/ancillary boards
When the system is powered, it will search for connected status units and/or ancillary boards.
When new or additional status units/ancillary boards are added to the system, these will be shown
on the display when the system is first powered.
Status units are shown as
Pux
and ancillary boards are shown as
Pox
(where
x
is the address of
the unit found).
The select key can be used to view all of the status units/ancillary boards that the system has
found.
These should be checked to ensure that the same number of devices that have been fitted are
found by the system.
For the system to accept these into its memory, the procedure below must be followed.
1. Operate the Enable Controls keyswitch.
2. Enable the Write Enable Switch (push to the right) – Access level 3.
3. The display will show
Pux
for status units and
Pox
for ancillary boards that are found
(where x is the address of each unit) and the dot in the display will be flashing. Operate the
Enter button which will accept the displayed unit and step through to the next unit found.
4. When the Enter button does not step on to any other units, all devices have been
accepted.
5. Disable the Write enable switch (push to the left).
6. Disable the Enable controls keyswitch.
7. The panel should return to the normal, quiescent condition.
