AFDAU-T1 Aerial Firefighting
Data Acquisition Unit
Installation Manual
AMS-IM-1-01 Rev. 7
22 September 2021
13
ADDITIVE TYPE
2.2.5 Premix Select
When sending Fill and Drop Start messages to the connected modem, the AFDAU-T1 will also send details on the
type of additive mixed with the water.
The AFDAU-T1 can be configured for a discrete switched signal that represents either WATER or premixed
RETARDANT product filled on one of either the 6 Relays or the 6 GPI inputs.
A typical configuration of this input is a pilot selectable, two position switch labelled WATER | RETARDANT.
The premix selection will always be overwritten with FOAM or GEL if an Additive Pump On signal is detected, see
sections 2.2.6 and 2.2.7.
2.2.6 Additive Select
When sending Fill and Drop Start messages to the connected modem, the AFDAU-T1 will also send details on the
type of additive mixed with the water.
The AFDAU-T1 can be configured for a discrete switched signal that represents either a GEL or FOAM additive on
one of either the 6 Relays or the 6 GPI inputs.
A typical configuration of this input is a pilot selectable, two position switch labelled GEL | FOAM.
The AFDAU-T1 will always default to WATER or RETARDANT (as selected by the Premix Select discrete, see section
0) regardless of Additive Selection unless an Additive Pump On signal is detected, see section 2.2.7.
2.2.7 Additive Pump On
When sending Fill and Drop Start messages to the connected modem, the AFDAU-T1 will also send details on what
type of additive mixed with the water.
The AFDAU-T1 can be configured for a discrete switched signal that tells the AFDAU-T1 to change from WATER type
to the additive type selected by the Additive Select input (see section 2.2.6) on one of either the 6 Relays or the 6 GPI
inputs.
AFDAU-T1
DISCRETE
SIGNAL
PROCESSOR
FOAM
GPI_1 - GPI_6
GEL
ADDITIVE TYPE
AFDAU-T1
DISCRETE
SIGNAL
PROCESSOR
WATER
GPI_1 - GPI_6
RETARDANT
