Field Service Procedure – Replacement PCU Kit, ST88, ST94 & ST144
Page
15
of
22
Document No
137738 Rev A
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Tel, Inc. This document may not be reproduced or distributed in any form without prior written
consent of Sea Tel, Inc.
19.
400MHz
Modem
PCB
Configuration:
The
400MHz
modem
PCB
has
a
jumper
block
(located
component
side
of
PCB)
that
is
used
to
configure
it
for
above
decks
or
below
decks
operation
as
well
as
to
configure
the
serial
communications
protocol
(RS232,
RS422,
or
RS485).
So
a
single
PCB
can
be
configured
to
work
in
either
the
above
or
below
decks
based
on
the
jumper
setting(s)
of
the
below
table.
Verify
the
configuration
of
the
defective
modem
installed
on
your
antenna
for
the
correct
configuration.
Standard
configurations
for
the
XX09,
XX10,
XX11
and
9797B
VSAT
systems
use
RS232
protocol
so
are
configured
to
‐
1
in
the
above
decks
and
‐
2
in
the
below
decks.
The
ST88,
ST94
and
ST144
TVRO
antennas
with
MK2
electronics
use
RS422
protocol
(as
opposed
to
the
RS232
protocol
used
on
the
XX09,
XX10,
XX11
and
9797B
series
VSAT
antennas)
therefore
the
PCB
is
configured
to
a
‐
3
as
per
the
below
table.
Should
the
above
decks
400MHz
modem
PCB
need
replacing
on
one
of
the
ST
series
antenna
an
additional
jumper
is
provided
in
the
kit
to
place
between
pins
3
‐
4
on
the
PCB
jumper
block
to
correctly
configure
the
communication
protocol
of
the
PCB.
Summary of Contents for ST144
Page 1: ......