CALAMP WIRELESS NETWORKS INC. BDD4T83-2 Manual De Usuario

Referring to Figure 3, two main backplanes are
used. Their main components are:

•

  RJ11 connector – Mirrors the one on the

front of the Speaker panel (series con-
nected to both backplanes). Used for
programming the Radio Assembly when-
ever the speaker panel has been removed.

•

  DB-25M plug at PL1 (one side of the

“Y” cable on each PCB) – used to supply
the receive signal to the BDLC

PD

’s single

“EXT.RADIO/TEST” DB-25F plug.

•

  Two channel-select DIP switches (SW1

and SW2)

•

  Cooling fan driver – CN2 located on

backplane connects to the horizontally-
mounted fan on top of the Radio assem-
bly and activated by BDLC’s PTT signal.

•

  Coaxial relay driver – not used.

The rack-mounted BDLC

PD

 is housed in a steel

case. It has no user serviceable parts. Unit’s con-
figuration is stored in flash memory (EEPROM).

Referring to Figure 2, the front panel of the
BDLC

PD

 has two cutouts across its length.

A- The left cutout groups the unit’s type label

and ten LED indicators:

•

  The S3 label designates the BDLC

PD

 as a

“three Serial-port” model

•

  The RF group of 3 LEDs

•

  The RS-232 group of 5 LEDs

•

  A single CK LED

•

  The ALARMS group of 4 LEDs

B- The right cutout groups two tactile (mem-

brane) switches (PF1 and RESET).

Referring to Figure 11, the BDLC

PD

 uses two

membrane-type switches labeled:

•

  RESET

•

  PF 1

These switches indicate contact by emitting a
short BEEP tone when pressed.

Pressing Reset produces the same result as pow-
ering OFF and ON again. It restarts the micro-
processor, the peripherals and invokes the on-
board diagnostics. BDLC

PD

’s radio modules’ in-

ternal flash-memories are read and their values
are loaded in system SRAM CPU flash-memory.

Normally, pressing Reset results in one short
BEEP tone followed by all LEDs coming ON for
about four seconds. Then, the LEDs flash in a
“ripple” pattern for close to two seconds indi-
cating diagnostics are in progress. At the end of
this period, all LEDs should be OFF except CK
that should flash about six to eight times per sec-
ond.

Expect an additional two seconds delay for CK to
start flashing and the UF indicator to come ON if
the radio assembly is not connected or not pow-
ered (see section 3.2.1.5.4 for Alarm details).

PF 1 is a multi-function switch:

•

  It clears LED error indications

•

  It initiates test transmissions

•

  It sets the function of the RS-232 LEDs