User's Manual

Sistema FIREMASTER III "Millennium" Manuale di istruzioni

From the above calculations, it will be possible to connect IN SERIES up to 7

igniters of this type with a 100% warranty of ignitions. These calculations are very

prudential and theoretical: in practice it would be possible to connect in series a lot

more igniters (giving up some safety margin).

In any case, when more igniters are to be connected in series, it is mandatory

using devices EACH OTHER IDENTICAL: not only of the same brand and

model, but possibly also coming from the SAME PRODUCTION LOT.

THE PARALLEL OR, WHORSE THE MIXED SERIES-PARALLEL

CONNECTIONS, MUST BE AVOIDED. ALSO THE SERIES

CONNECTIONS SHOULD BE REDUCED TO THE MINIMUM

POSSIBLE.

- The line connectors must be clean and free from oxidation (this will increase

the total line resistance).

- Make sure the connection wire has a sufficient section in order to grant a good

contact to the binding post. Eventually bend several time the terminal part of

the wire.

- Make sure the terminal part of the wire inserted in the binding post is

completely free from the insulating sleeve (many misfires are due to this

inadvertence!)

- Make sure the unprotected parts of wire eventually coming out of the

connector doesn't contact any other metal parts of the Unit (antenna, case,

connectors of other lines, etc.).

4.6.2 RS-485

The connection using the RS-485 line, allows the FIREMASTER III System to

be used eliminating the RADIO circuits.

When this operating mode is used, it will be necessary to take into account for

some limitations:

- The maximum number of Remote Units that can be connected together must

be limited to about 20

- The communication by RS-485 serial line is available for the FIRE mode only.

All the programming, testing and modify operations to the Remote Units,

must be still performed using the RADIO link.

- The RS-485 port, when in FIRE mode, is always active: this allows to use the

Firemaster System with a MIXED MODE (RADIO + CABLE).

- If the MIXED mode is used, then the Remote Units must be programmed in

RADIO LINK mode and the antennas must be CONNECTED. Only if

ALL THE REMOTE UNITS have been programmed in "CABLE" mode, it

will be possible to remove the antennas (FOR THE "FIRE" FUNCTION

ONLY).

Nmax =−=