Addressing - ASCOM T942C System Installation

System Installation
Ascom Paging System
9

Addressing

All units connected to the system bus must have an address to enable communication
with other modules. The address must be set with the address switch before power is
applied to the unit, as the address is read and stored at start-up. At start-up the function
indicator (LED) on the unit starts to blink at about 8 Hz and after max 90 seconds lights
continually. This indicates that communication with the central unit has been established.
The address consists of two hexadecimal digits that are selected by the eight sections of
the address switch. Sections 5-8 of the switch select the first (most significant) digit and
sections 1-4 select the second digit.
OFF
1
8
Figure 8. Address switch.
The two hex digits provide a total of 256 possible addresses in the system. The figure
below shows how to set the hex digits 0-F.
Examples:
Figure 9. Hexadecimal address settings.
The Central Unit always has address 00 and other modules can then be addressed in
ascending sequence. Each address must be unique within the installation regardless of
which bus it is connected to. Transmitters in non-speech systems must have hex 0 as the
first (most significant) digit unless sequential transmission is used.
Note: In speech systems the transmitters must be in the address range for speech
transmitters (hex address 80-FF).
10 October 2013 / Ver. D
1
ON
4
5
8
Hex address 5 D
OFF ON
Hex 0 Hex 1 Hex 2
OFF ON
Hex 8 Hex 9 Hex A
OFF ON
1
Hex 0
Hex 0
8
Hex address 00
Sections 1 - 4
second hex digit (D)
Sections 5 - 8
first hex digit (5)
Hex 3 Hex 4 Hex 5
Hex B Hex C Hex D
OFF ON
1
Hex 1
Hex 0
8
Hex address 01
TD 90227GB
Hex 6 Hex 7
Hex E Hex F
OFF ON
1
Hex F
Hex 1
8
Hex address 1F
16