Moseley MRC-l User manual
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INSTRUCTION
MANUAL
J
...---
[
I
-~--MODEL
MRC-l
MIeROPROCESSOR
REMOTE
CONTROL
SYSTEM
REMOTE
TERMINAL
MOSELEY
ASSOCIATES, INC.
Santa
Barbara
Research
Park
111
Castilian
Drive
Goleta,
California
93017
Rev.
9
June
1980
(805)
968-9621
WARNING
This
equipment
generates,
uses,
and
can
radiate
radio
frequency
energy
and
if
not
installed
and
used
in
accordance
with
the
instruction
manual,
may
cause
interference
to
radio
communications.
As
temporarily
permitted
by
regulation
it
has
not
been
tested
for
compliance
with
the
limits
for
Class
A
computing
devices
pursuant
to
Subpart
J
of
Part
15
of
FCC
Rules,
which
are
designed
to
provide
reasonable
protection
against
such
interference.
Operation
of
this
equipment
in
a
residential
area
is
likely
to
cause
interference
in
which
case
the
user,
at
his
own
expense
will
be
required
to
take
whatever
measures
may
be
required
to
correct
the
interference.
1
January
1981
1.
0
SYSTEM
INTRODUCT.ION
1.1
INTRODUCTION
The
MRC-l
Microprocess
'
or
Remote
Control
System
is
a
modular
solid-stat~
microprocessor-based
system
designed
to
meet
the
needs
of
the
broadcaster
to
obtain
remote
indications
of
analog
and
status
information,
and
to
provide
remote
control
of
his
equipment.
The
MRC-l
consolidates,
into
one
convenient
package,
all
the
features
of
existing
moderately-priced
remote
control
systems
that
require
numerous
auxiliary
devices
to
function
as
a
system
in
addition
to
many
features
normally
found
in
large-scale
re-
mote
control
systems.
The
many
features
incorporated
into
the
MRC-l
are
made
possible
through
the
use
of
a
microprocessor
as
the
main
control
and
logic
element
_
of
each
Remote
and
eontrol
Terminal.
The
flexibility
of
the
microprocessor
has
also
led
to
some
changes
in
the
terminology
that
is
used
to
describe
the
functions
per-
formed
by
the
MRC-l
and
the
way
it
is
connected
as
a
system.
It
is
highly
recommended
that
personnel
installing
an
MRC-l
for
the
first
time
completely
read
and
understand
the
manual
before
attempting
to
connect
the
MRC-l
to
the
user's
equipment.
There
are
two
separate
manuals
for
a
complete
MRC-l
system.
One
manual
is
for
the
Control
Terminal;
the
second
manual
for
the
Remote
Terminal.
MRC-l
1-1
1.•
1.1
Manual
Organization
This
manual
has
been
designed
to
guide
the
user
through
the
many
features
of
the
MRC-l
in
a
logical
manner.
Following
the
system
specifications
and
unpacking
instructions,
Section
4
defines
the
operation
of
the
Remote
and
Control
Terminals.
Once
the
operation
of
the
system
is
mastered,
Section
5
describes
how
to
connect
the
MRC-l
to
equipment
being
monitored
and
controlled.
Section
6
defines
the
adjustment
and
calibration
of
the
unit.
Section
7
is
a
guide
to
maintenance
of
equipment
should
any
difficulties
be
encountered.
Section
8
contains
circuit
card
descriptions,
sche-
matics
and
illustrations
organized
by
type
of
circuit
card.
The
last
section
will
contain
data
for
any
options
that
were
ordered
as
a
part
of
the
system.
Should
options
be
ordered
at
some
future
time,
the
option
data
may
be
appended
to
this
manual
by
the
user.
1.1.2
Technician
Safety
The
compact
and
modular
design
of
the
MRC-l,
with
convenient
access
to
all
modules
and
wiring,
dictates
that,
from
a
safety
standpoint,
no
lethal
voltages
be
accidentally
accessible
to
the
technician.
With
the
exception
of
the
AC
mains,
which
are
made
difficult
to
access,
all
internal
voltages
are
less
than
15
volts
in
magnitude.
The
user-applied
voltages
are
limited
to
a
maximum
of
48
volts
at
any
terminal
(generally
less)
so
that,
when
per-
forming
normal
maintenance
on
the
equipment,
no
lethal
voltages
are
present
inside
the
chassis.
All
high-voltage
power
switching
and
control
must
be
performed
indirectly
by
equipment
external
to
the
MRC-l.
1.2
SYSTEM
OVERVIEW
An
MRC-l
system
consists
of
a
Control
Terminal
and
from
one
to
nine
Remote
Terminals.
Each
Remote
Terminal
may
access
up
to
MRC-l
1-2
32
status
inputs
(ON/OFF),
32
telemetry
inputs
(analog),
and
up
to
64
command
outputs
CON/OFF).
The
Control
Terminal
communicates
with
each
of
the
Remote
Termi-
nals
over
a
single
communications
circuit
that
connects
all
lo-
cations.
The
communication
circuit
may
be
either
2-wire
or
4-wire
(or
equivalent)
telephone
lines,
STL
subcarrier,
aural
SCA
or
private
radiol
microwave
links.
Figure
1-1
is
a
typical
illus-
tration
of
the
Control
Terminal
connected
to
several
Remote
Ter-
minals.
In
operation,
one
of
the
remote
sites
is
selected
for
display
at
the
Control
Terminal.
The
value
of
each
of
the
32
status
inputs
is
displayed
on
a
set
of
32
LED's.
Calibrated
analog
values
are
digitally
displayed
one
at
a
time.
A
CHANNEL
SELECT
key
is
used
to
display
the
desired
channel.
The
Remote
Terminals
.
perform
seven
(7)
basic
functions:
MRC-l
1.
The
remote
keyboards
are-used
to
set
up
the
system.
When
the
system
is
installed,
calibration
data,
alarm
criteria,
and
so
forth,
are
entered
at
each
Remote
Terminal
keyboard.
These
may
be
changed
from
the
remote
keyboards
during
operation.
2.
Once
the
system
has
been
set
up,
the
Remote
Termi-
nals
process
the
incoming
data
according
to
the
details
of
how
the
system
was
set
up.
The
necessary
computations
for
calibration,
alarm
checking,
etc.,
are
performed
at
the
Remote
Terminals.
3.
The
Remote
Terminals
process
and
transmit
data,
and
turn
ON
and
OFF
the
command
output
lines
as
instructed
by
the
operator
activating
the
Control
Terminal.
1-3
•••••
i i
000
•••••
000
•••••
01]0
000
•••••
CONTROL TERMINAL
COMMUNICATIONS
CIRCUIT
(2
WIRE/4
WI
RE
TELCO, RADIO
OR
COMBINATIONS)
<" i TELEMETRY I
NPU
-
')
•••••
i
000
•••••
1..,
__
...I
{~.....
000
:::::
000
ODD
.r
I STATUS INPUTS
..
<
~
OUTPUT COMMAN
REMOTE
.... I TELEMETR·Y INPUTS
•••••
I
000
•••••
If?' I STATUS IN
PUTS
l
•••••
ODD
·
~:::::
000
000
,e
~OUTPUT
COMMANDS
REMOTE
2
•
•
•
~
I
TELEMETRY
INPUTS
•••••
i
000
•••••
"
•••••
000
~:::::
000
DOD
<
STATUS
INPUTS
> C
::;'OU
T
PUT
COMMAN
OS
REMOTE
N
FIGURE
I-I
TYPICAL
MR C-I
SYSTEM
INTERCONNECT
MRC-1
1-4
4.
The
Remote
Terminals
check
for
alarms
and
notify
the
Control
Terminal
should
an
alarm
condition
be
found.
5.
If
desired,
a
remote
site
may
be
operated
directly
from
its
own
front
panel,
if
it
is
placed
in
MAINTE-
NANCE
OVERRIDE -
mode.
6.
The
Remote
Terminals
provide
a
fail-safe
output
as
required
in
broadcast
applications.
7.
The
Remote
Terminals
continually
monitor
changes
in
their
individual
conditions
(e.g.,
with
temperature)
and
make
slight
adjustments
in
calibration
calcula-
tions
as
required.
The
Control
Terminal
is
specialized
to
communicate
with
the
various
Remote
Terminals,
requesting
display
information
and
processing
alarm
reports
as
required.
The
Control
Terminal
prepares
messages
to
the
various
Remote
Terminals
according
to
the
actions
of
the
user.
Much
of
the
power
of
the
MRC-l
is
due
to
the
flexibility
avail-
able
to
the
user
in
setting
up
the
system.
Specifically:
MRC-l
1.
Telemetry
(analog)
channels
may
be
calibrated
in
three
ways:
a.
Directly
proportional
to
input
level
(linear
calibration)
b.
Proportional
to
the
square
of
the
input
level
(power
calibration)
c.
Proportional
to
the
product
of
two
te
-
lemetry
(analog)
inputs
(indirect
calibration)
2.
Each
of
these
calibrated
telemetry
(analog)
channels
may
have
an
upper
and
lower
limit.
If
these
limits
have
been
established,
the
input
is
sampled,
adjusted
1-5
MRC-1
according
to
calibration,
and
compared
against
the
limits.
Any
violation
causes
an
alarm.
3.
Each
of
the
individual
status
inputs
may
be
given
attri-
butes
causing
them
to
"latch"
or
be
inverted
before
display.
Each
status
input
may
be
set
up
to
trigger
an
alarm,
either
on
rising
~dge
or
falling
edge
(or
both).
4.
Any
command
output
may
be
assigned
to
either
the
RAISE
or
LOWER
key
for
·
any
s,Pecified
channel.
"Latching"
com-
mand
lines
also
may
be
specified,
in
which
case,
push-
ing
RAISE
turns
the
command
output
ON,
and
pushing
LOWER
turns
it
OFF.
5.
Telemetry
inputs
may
be
assigned
"Mute"
status
inputs.
If
the
"Mute"
status
input
is
ON,
the
telemetry
data
is
dis-
played
and
'
limit-checked
normally.
If
the
"Mute"
status
input
is
OFF,
limit
checking
is
suppressed.
1-6
2.0
SYSTEM
SPECIFICATIONS
2.1
INTRODUCTION
The
MRC-l,
as
a
system,
can
accommodate
a
wide
variety
of
options
with
regard
to
interfacing
the
system
to
the
user's
equipment.
The
specifications
for
each
interface,
in
addition
to
system
specifications,
are
detailed
in
this
section.
2.2
SYSTEM
SPECIFICATIONS
,
The
following
are
general
system
specifications
for
the
MRC-l:
Type
of
System
Number
of
Control
Terminals
Per
System
Number
of
Remote
Terminals
Failsafe:
Control
Telemetry
Output
Alarm
Indications
Maintenance
Override
MRC-l
Microprocessor-based
Control
and
Remote
Terminals.
One
(1)
Control
Terminal
active
in
a
system
at
a
time
One
(1)
to
nine
(9)
Remote
Termi-
nals
in
a
system
Complies
with
current
FCC
require-
ments
for
AM,
FM
and
TV
service.
Responds
45
seconds
after
failure
of
interconnecting
circuit.
Internal
timers
and
monitors
for
FCC
TV
compliance
N.C.
transistor
closure
at
48V,
'
100
rnA
Visual
and
aural.
Aural
alarm
defeatable
and
remoteable.
Remote
Terminal
front-panel
con-
trol
provides
Remote
Terminal
"GO
HOME"
transistor
closure
and
Control
Terminal
indication.
N.O.
transistor
at
48V,
100mA,
isolated.
2-1
Interconnect
Interconnect
Classes
2-Wire/4-Wire
FM
Subcarrier
(Optimal)
Modulation
Data
Rate
Data
Format
Data
Checking
Command
Functions
Number
of
Command
Lines
Command
Line
Modes
Command
Line
Association
Tally-Back
Response
Time
Status
Functions
Number
of
Channels
MRC-l
2-wire,
4-
wire,
FM
subcarrier,
or
combinations
Nominal
600Q
balanced
line.
Series
3002
(unconditioned)
data
channel
per
Bell
System
Technical
Reference
PUB-4l004.
Two-way
non-simultaneous.
Nominal
send
level
0 dBm;
receive
level
-30
dBm
minimum
Nominal
levels
1.sV
p-p
at
2kQ.
Frequency
range
26
kHz
to
185
kHz
Two-tone
FSK;
1200
Hz
idle,
2200
Hz
mark
frequencies
1200
bits
per
second
10
bits,
7-bit
ASCII
plus
parity,
start,
stop
bits
Parity
by
character,
longitudinal
redundancy
check
and
fixed
formats
16,
32,
48
or
64
lines
per
Remote
Terminal
Each
line
programmable
by
user
for
momentary
or
latching
operation
Each
momentary
programmed
line
is
user-assignable
to
one
or
more
telemetry
channels.
Each
latch-
ing
line
is
assignable
to
one
telemetry
channel.
Front-panel
LED
indicators
at
Remote
and
Control
Terminals
250
ms,
nominal
16
or
32
channels
per
Remote
Terminal
2-2
States
Attributes
Response
Time
Telemetry
Functions
Number
of
Channels
Calibration
Calibration
Modes
Display
Alarms
Muting
Input
Filtering
Display
Response
Time
Self
Check
Physical
Specifications
Power:
Standard
Control
Remote
&
Expanded
Con
tro
1
~1RC-l
Rev.
16
Dec
1981
User-programmable
for
N.O./N.C.
activating
front-panel
LED's
Latching
or
Following
Alarm
on
rising,
falling,
or
both
conditions
(or
no
alarm)
250
ms,
nominal,
per
site,
from
status
change
at
Remote
Terminal
to
Control
Terminal
indication.
16
or
32
channels
per
Remote
Ter-
minal
Via
keyboard
at
Remote
Terminal
in
user-selected
units
of
measure
Linear,
power-to-linear,
and
in-
direct
power
calculation
4
digits
with
decimal
point
and
polarity
sign
for
value
and
limits
display
Fully
tolerance-alarmed
for
high
and/or
low
limits
User-assignable
status
channel
to
cause
alarm
muting
Digital
two-pole
filter
500
ms,
nominal,
from
request
at
Control
Terminal
A
self-calibration
cycle
performed
at
approximately
4-second
inter-
vals
120/240
VAC
50/60
Hz,
50
watts,
nominal
120/240
VAC
50/60
Hz,
100
watts,
nominal
2-3
Size:
Standard
Control
Remote
&
Expanded
Control
Operating
Temperature
13.3
cm H x
48.3
cm W x
38.1
cm D
(5.25"
H x
19"
W x
15"
D)
Depth
less
connectors
17.8
cm H x
48
.. 3 cm W x
39.4
cm D
(7"
H x
19"
W x
15.5"
D)
Depth
less
battery
or
connectors
0°
-
50°C
2.3
ANALOG-TO-DIGITAL
CONVERTER
MODULE
The
following
specifications
apply
to
the
analog-to-digital
(A/D)
converter
assembly
supplied
as
a
part
of
the
system:
Channels
Resolution
Inputs
Maximum
Input
Sample
Interval
Overall
Measurement
Accuracy
2.4
TTL
STATUS
INPUT
MODULE
16
channels
per
module,
2
modules
(maximum)
per
Remote
Terminal
One
part
in
1024
Double-ended
±3.5
volts
nominal,
lOOk
DC
bridging
±5.0
volts.
Application
of
volt-
age
above
this
level
causes
erratic
operation
of
one
or
more
channels.
Damage
level
is
±40
volts.
A
channel
is
sampled
more
than
twice
a
second,
regardless
of
the
number
of
channels
in
the
Remote
Terminal.
Better
than
0.5%
The
following
specifications
apply
to
the
TTL
Status
Input
Module
supplied
in
the
MRC-l
system:
Number
of
Channels
MRC-l
Rev.
28
April
1981
16
per
module,
2
modules
(~aximum}
per
Remote
Terminal
2-4
Input
Configuration
Voltage
Reference
Maximum
Input
Voltage
Minimum
Input
Voltage
Logic
High
Level
Input
Voltage
Logic
Low
Level
Input
Voltage
Short
Circuit
Output
Current
Low-power
TTL
with
10k
pull-up
to
t5
volts
DC
Chassis
signal
ground
+5.5
volts
DC
~
Contact
closure
to
(
ground
will
operate
0.0
volts
/
circuit
Greater
than
2.0
volts
Less
than
0.8
volts
Less
than
1.0
rna
2.5
OPTICALLY-ISOLATED STATUS INPUT
MODULE
The
following
specifications
apply
to
the
Optically-Isolated
Status
Input
Module
that
can
be
interchanged
with
the
TTL
Status
Module.
Both
~odule
types
may
be
mixed
within
a
single
Remote
Terminal:
Number
of
Channels
Input
Configuration
Voltage
Reference
Maximum
Input
Current
Maximum
Voltage
16
per
module,
2
modules
(maximum)
per
Remote
Terminal
LED
optical
isolator
Two-terminal
isolated
from
refer-
ence
30
rna
maximum
through
optical
isolator,
user-supplied
current.
User-changeable
current
limiting
resistors
±50
volts
above
chassis
ground
2.6
OPEN
COLLECTOR
COMMAND
OUTPUT
MODULE
The
Open
Collector
Command
Output
Module
is
supplied
in
an
MRC-l
system
for
activating
external
devices:
MRC-l
Rev.
16
Dec
1981
2-5
NtUllber
of
Outputs
Output
Configuration
Voltage
Reference
Maximum
Voltage
Maximum
Current
Voltage
Drop
(250
m~l
16
comm~nd
outputs
per
.module,
4
modules
Cma
.ximuml
per
Remote
Terminal
High
current
peripheral
driver
integrated
circuit
Chassis
signal
ground
48
volts
DC,
user-supplied
250
ma,
user-supplied
1.5
volts
2.7
OPTICALLY-ISOLATED
COMMAND
OUTPUT
MODULE
The
Optically-Isolated
Command
Output
Module
can
be
interchanged
with
the
Open
Collector
Output
Module
for
activating
external
devices:
Number
of
Outputs
Output
Configuration
Voltage
Reference
Maximum
Voltage
Maximum
Current
Voltage
Drop
(250
rna)
MRC-l
Rev.
9
June
1980
16
command
output
·
per
module~
4
modules
(maximum)
per
Remote
Terminal
Optical
isolator
driving
high-
current
Darlington
Two-terminal
48
volts
DC
between
terminals,
user-supplied
250
rna,
user-supplied
1.5
volts
2-6
3.0
UNPACKING
AND
PRE-INSTALLATION
CHECKOUT
3.1
UNPACKING
Upon
removing
the
units
from
the
shipping
cartons,
please
inspect
them
carefully
for
internal
and
external
damage
that
may
have
occurred
during
transit.
Verify
that
all
printed
circuit
cards
are
seated
firmly
in
the
mother
boards.
All
cards
are
the
same
length
and
all
should
appear
to
be
seated
in
the
card
cage
to
the
same
depth.
An
instruction
manual
-
Control
Terminal
or
Remote
Terminal
-
is
shipped
with
each
unit.
There
is
some
terminology
that
is
used
to
describe
the
location
of
components
on
the
PC
boards
within
the
card
cages.
The
cards
in
a
Standard
Control
Terminal
are
mounted
horizontally
(component
side
up)
while
those
in
a
Remote
-
Terminal
or
expanded
Control
Terminal
are
mounted
vertically
(component
side
to
the
right).
The
location
of
the
components,
i.e.,
LED's,
test
points,
and
switches
are
always
given
as
if
the
cards
were
mounted
vertically.
The
top
edge
of
a
card
in
a
Standard
Control
Terminal
is
the
left-hand
edge;
the
bottom
the
right
side.
Initial
checkout
of
certain
options,
such
as
the
LOGGER
and
POWER
FAIL/MEMORY
are
covered
in
the
documentation
supplied
with
the
option
and
presumes
that
the
basic
unit
pre-installation
checks
have
been
performed.
All
units
are
checked
out
as
a
total
system,
as
ordered.
The
main
purpose
of
pre-installation
checkout
is
for
the
user
to
gain
familiarity
with
the
system
while
both
the
Control
and
MRC-l
Rev.
28
April
1981
3-1
Remote
Terminals
are
easily
accessible
and
together
on
a
bench
at
the
same
location.
It
is
recommended
that
the
user
read
the
entire
manual
to
understand
the
MRC-I
prior
to
attempting
a
hookup
to
his
equipment.
While
the
installation
is
relatively
simple
and
straightforward,
certain
details
of
installation
and
operation,
if
overlooked,
may
cause
what
appear
to
be
equipment
failures.
3.2
POWER
SUPPLY
SHIPPING
HOLDDOWN
A
shipping
screw
is
provided
to
hold
down
the
power
supply
during
transit.
The
screw
·
is
located
on
the
left-hand
side
of
the
bottom
chassis
plate
near
the
rear.
Removal
of
the
shipping
screw
prior
to
installation
of
the
equipment
into
the
rack
will
allow
removal
of
the
power
supply
assembly
for
servicing
without
removing
the
entire
chassis
from
the
rack.
CAUTION
tiHENEVER
THE
UNIT
IS
SHIPPED,
THE
SHIPPING
SCREW
MUST
BE
INSTALLED
AND
SECURELY
FAS-
TENED. FAILURE
TO
OBSERVE
THIS
PRECAUTION
CAN
RESULT
IN
PHYSICAL
DAMAGE
TO
THE
UNIT
AND
VOIDS ALL
WARRANTIES
IF
SHIPPED WITH-
OUT
THE SCREW.
The
shipping
screw
should
be
saved
and
taping
the
screw
to
the
chassis
for
any
possible
shipment
is
encouraged.
3.3
PRE-INSTALLATION
CHECKOUT
The
followin~
procedures
apply
to
checking
the
Control
and
Remote
Terminals
on
a
stand-alone
basis
upon
receipt
of
the
units.
l~
Verify
that
the
power
line
voltage
selector
and
fuse
are
set
for
the
line
voltage
to
be
applied
to
the
unit.
The
voltage
selector
is
located
MRC-l
3-2
Rev.
10
Nov.
1980
MRC-1
~t
the
left
re~r
of
th~
ch~ssis~
The
units
are
shipped
fo~
120
VAC
ope~~tion,
unless
otherwise
specified.
The
vo~tage
selected
can
be
observed
on
the
PC
card
through
the
window
in
the
AC
power
connector.
To
change
the
voltage,
remove
the
power
cord,
slide
the
access
window
to
the
left,
and
with
small
needle-nose
pliers,
grasp
and
remove
the
PC
card.
Orient
the
card
for
proper
operation
-
either
12'0
VAC
or
220
VAC
only
-
and
firmly
replace
the
PC
card.
Install
the
prope~
fuse
for
the
applied
voltage
as
indi-
cated
by
the
placard
on
the
AC
mains
connector.
Slide
the
window
to
the
right
and
install
the
AC
m,ains
connector.
2.
Install
the
backup
battery,
provided
only
with
the
Remote
Terminal.
Connect
the
plus
terminal
of
the
battery
to
the
red
terminal
of
the
CPU
I/O
connec-
tor
and
the
negative
to
the
black
terminal
of
the
CPU
I/O
connector.
Batteries
are
shipped
discon-
nected
to
prevent
complete
discharging.
3.
Open
the
front
panel
by
turning
the
knurled
screw
on
the
right
side
of
the
panel
counterclockwise
until
the
fastener
disconnects
and
the
panel
can
be
swung
open.
4.
Connect
the
AC
power
connector
to
the
AC
mains.
. ,
Depress
the
!lACK"
key
on
the
Remote
Terminal
front
panel
in
order
to
clear
the
"cold
start
II
condition
which
occurs
whenever
the
Remote
Terminal
is
power-
ed
up
after
the
contents
of
memory
have
been
lost.
5~
Observe
that
the
three
upper
LEDs
on
the
CPU
board
-
the
bottom
slot
of
the
card
cage
-
are
ON.
3-3
Rev.
10
Nov.
1980
These
three
LED's
monitor
the
+15,
+5
and
-15
volt
power
supplies
and
are
illuminated
when
there
is
voltage
present.
6.
Depress
the
"Reset"
switch
on
the
CPU
board.
Observe
that
the
single
LED
near
the
switch
illuminates
while
the
switch
is
depressed
and,
for
a
short
period,
after
the
switch
is
released.
7.
Observe
the
top
LED
on
the
modem
PC
board.
It
should
turn
ON
and
OFF
at
a
periodic
rate
indicating
that
the
Control
Terminal
is
attempting
to
communicate
with
Remote
Terminals.
8.
Depress
the
LAMP
TEST
k-ey.
All
LED's
and
displays
on
the
Terminal
should
illuminate.
A
second
depression
of
the
LAMP
TEST
key
will
restore
all
LED's
and
displays.
9.
This
concludes
initial
checkout.
Note
that
after
six
seconds
an
alarm
condition
will
be
indicated
at
the
Control
Terminal
by
a
flashing
"DATA
F.RRO~'
LED
because
of
the
failure
to
communicate
with
a
Remote
Terminal."
3.4
PRE-INSTALLATION
SYSTEM
CHECKOUT
Follow
the
individual
checkout
procedures
for
the
Control
Terminal
and
each
Remote
Terminal
supplied
as
part
of
a
system.
MRC-l
3-4
Rev.
10
Nov.
1980
The
Remote
and
Control
Terminals
should
be
connected
back-to-back
to
verify
communications
according
to
the
type
of
communications
board
supplied.
A.
Modem
Telco
Interface
tfuen
telephone
lines
are
used
for
communication
in
both
directions,
this
board
will
be
supplied
for
the
Remote
and
Control
Terminals.
Two
modes
of
operation
are
possible~
two-wire
or
four-wire.
In
the
two-wire
mode,
one
telephone
pair
carries
both
Remote
and
Control
message
transmissions.
In
the
four-wire
mode,
the
Remote
and
Control
Terminal
messages
are
transmitted
on
separate
telephone
pairs,
giving
slightly
better
noise
immunity.
Figure
3-lA
shows
two-wire
interconnection
techniques.
Figure
3-lB
shows
four-wire
interconnection.
CONTROL
TERMINAL
TELCO
INTERFACE
MRC-l
(
lAD
BOARD
FRON
BOTTON,OR
3
RD
BOARD FROM
RIGHT)
JUMPER
z 2
JUMPER 3 JUMPER 3
4 4
5 I I ( 5
016
REMOTE
TERMINAL
FIG.
3-IA
6
REMOTE TERM
INAL
2
THROUGH
9
TWO-WIRE'
TELEPHONE
LINE
INTERCONNECTIONS
3-5
CONTROL TERMINAL TELCO INTERFACE
(SRD
BOARD
FROM
BOTTOM,
OR
3
RD
BOARD
FROM
RIGHT)
6 5 4 3
ll)
o _0 0 2 I
0
01
........
,
/
I TELCO \
I
PAIR
I
\ TWO
,/
.....
-
-
.....
/ \
I
TELCO
\
I PAIR I
\ ONE I
\
, I
-;'
.-
0-
-I
0 2
-0-
3
0-
i"'4
0 5
0-
6
'---
'--
REMOTE
TERMINAL
TELCO
INTERFACE
SITE
I
FIG
3-18
FOUR-W
IRE
TELCO
TNTERFACE
r---
1
0 2
3
4
0 5
6
'--
REMOTE
TERMINAL
TELCO INTERFACE
SITE
2 THRU 9
After
the
units
are
interconnected,
measure
the
output
levels
and
modem
input
level
and
adjust,
if
necessary,
as
described
in
Sec-
tion
6
of
this
manual.
These
levels
should
be
checked
again
when
the
unit
is
installed
at
the
final
location.
Adjusting
these
controls,
taking
into
consideration
actual
telco
line
loss,
will
greatly
improve
communications
reliability.
B.
Subcarrier
Interface
When
FM
subcarriers
are
used
for
data
in
both
directions,
this
board
will
be
supplied.
Interconnection
is
quite
simple.
Using
two
BNC-to-BNC
connector
cables,
interconnect
units
as
shown
in
Fig.
3-2.
MRC-l
3-6
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