16
and B channel outputs/inputs, and five LEDs: a red, steady Power LED, and four green,
flashing transmit/receive LEDs as shown in Figure 2-1.
• Two 926 MHz antennas for receiving RF transmissions from the AIM2™ module. These
antennas may be attached to the FMU, or external (remote) antennas may be installed to
ensure best possible RF coverage. The antennas are connected internally to the FRB.
External antennas may be necessary when an FMU is physically separated from line-of-sight
with the fueling vehicles. The external antennas may be used to restore line-of-sight to the
fueling vehicles. External antennas installed under a roof or higher than FMU height should be
installed horizontally instead of vertically. The two antennas should be spaced 8 inches (or in
multiples of 8 inches) apart.
• Quad UART board to control a second FRB when a secondary application requiring directional
antennas (for Access Point) is needed.
• A Compact Flash Card for operating and programming memory. It is absolutely necessary for
FMU-3500 functions. The compact flash card is now standard in all FMU-2500 series units.
Some older FMU-2500 units being upgraded to FMU-3500 may require a newer revision
mainboard to accept and correctly read compact flash cards.
FMU-3535 Passive Mobile. The FMU-3535 Passive Mobile is an FMU-3500 adapted for
mobile use on tanker trucks. The FMU-3535 provides a mobile capability for fueling AIM2™
equipped vehicles or equipment which may not be able to return to a service station for fueling.
Passive Mobile installations are covered in a separate installation manual.
Automotive Information Module. The Automotive Information Module (see Figure 2-2) is
an intrinsically safe vehicle mounted transceiver/computer which stores vehicle information and
communicates with the FMU to authorize fueling hoses and receive programming information. The
standard module (part number 941B0420A) has an internal antenna and is suitable for most
applications. When necessary, an external antenna may be installed and connected to part
number 941B0420B AIM2™ modules. 941B0420A modules do not have external antenna
connections. 941B0420B modules do not have internal antennas. External dimensions of both
modules are approximately 5-5/8 inch long x 2-3/8 inch wide x 1 inch high. Acceptable input
power is 12 VDC to 42 VDC. AIM2™ modules draw 0.4 amps when active, and 0.0134 amps in
sleep mode. The AIM2™ module is designed for operation in temperatures ranging from -60 to
+140 degrees F.
941B0420A 941B0420B
External Antenna
Connector
Indicator LEDs
Fi
ure 2-2. AIM2™ Modules
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