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1 OPERATION

1.1 GENERAL

The B1225E Alarm Expander Unit is an 8-input, 4-output board which expands the number

of alarm inputs and relay outputs. The expander boards connect to the B1225 ARU and to

each other via a serial cable. All of the programmable features of the B1225E are controlled

by the B1225 master, such as debounce time, relay on/off codes, DTMF on/off codes, input

polarity and voice messages.

The maximum number of expander boards which may be added to one B1225 ARU is seven.

Each expander has a binary address controlled by a DIPswitch on the board. The four relay

contacts available for remote control respond to DTMF codes received over the radio by the

master (B1225 ARU).

1.2 ALARM TRANSMISSION

When an alarm goes into an “active” state or a timer expires, the B1225 ARU goes through

the transmission sequence described in the B1225 operator’s manual: transmitting the master

site ID, master alarms, expander ID, and alarm conditions. The expander(s) will send out the

DTMF-on code and voice messages until the alarm returns to normal;then the DTMF-off

code is sent. A different DTMF code can be programmed for each input, providing eight

DTMF on and eight DTMF off sequences in total.

1.3 RELAY CONTROL

The four relay outputs are controlled through the master. By programming the “Relay on

code” and “Relay off code”, as shown in the programming section, the B1225E’s relays can

be remotely controlled.

When the master receives a Relay On (or Off) code over the radio system, it will turn the

corresponding expander relay on (or off) and transmit over the radio system the relay num

ber and new condition.

1.4 MEMORY STORAGE

The B1225E holds all of its operating parameters in battery backed up RAM. Internally, all

operating parameters are stored in two separate memory locations: a working space and a

redundant storage space. Both memory spaces are protected by a security code, ensuring

that all information is valid. Should one piece of data become corrupt in either of the data

spaces, it is automatically replaced with the valid data from the other location.

If a major error occurs and both the working and the storage data spaces have been cor

rupted, the B1225E will signal the master to reset all parameters concerning the expander to

default values. At this point the announcement “(SITE ID) - PROGRAM x CODE ERROR”

is made (x representing the number of the expander with the major errors).

Security codes and the RAM redundancy affect only the operating parameters and are not

used for the stored site identifier or alarm voices.

B1225E BARNETT ENGINEERING LTD. PAGE 2

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Code Alarm CR3 Manuale Utente Pagina 3