Moseley MRC-1600 User manual
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WARNING
This
equipment
complies
with
the
requirements
in
Part
15
of
Class
A
computing
device.
Operation
of
a
residential
area
may
cause
unacceptable
radio
and
TV
reception
requiring
the
whatever
steps
are
necessary
to
correct
FCC
Rules
for
a
this
equipment
in
interference
to
operator
to
take
the
interference.
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I
I
Warrantp
All
equipment
designed
and
manufactured bv :-vloseley A.ssociates, In
c.
is warranted
against defects in
workmanship
and
material that
develop
under
normal use within a period
ot
o
ne
(1) y
ear
, or (
2)
years
fo
r all MRC series
equipment,
from the
date
of original
shipment,
and
is
also
warranted to
meet
any
sp
ecifications
represented
in writing
by
MoseleyAssociates, Inc., so longasthe
purchaser
is
not
in default
under
his
contract of purchase
and
subject to
the
following additional
conditions
and
limitations:
l.
The
sole responsibility
of
Moseley Associates. In
c.
for
any
equipment
not
conforming
to this Warrantv sha
ll
be
. at its option:
A.
To repair
or
replace
such
equipment
or
otherwise
cause
it to
meet
the
represented
specifications
eithe
r
at
the
pu
r
chaser's
installationor
upon
the
return
thereof
f.o.b. Goleta,
California, as directed
by
Moseley Associates, lnc.;
or
8.
To
accept the return
thereof
f.o.b. Goleta, California,
credit
the
purchaser's
account
for the
unpaid
portion.
if
any. of the purchase
pnce
,
and
refund
to the purchaser, without
interest,
any
portion of the
pu
r
chase
price theretofore paid;
or
C.
To
demonstrate
that the
equipment
has
no
defectin
workmanship
or
material
and
that
1t
meets the represented specifications, in which
event
all
expenses
reasonably
i
ncurred
bv :vtoseley Associates, Inc
.,
in so demonstrating, including but
not
limited to
costs of travel to
and
from the purchaser's installation,
and
subsistence, shall
be
paid by
purchaser to Moseley Associates. Inc.
2. In case
of
any equipment thought to
be
defective. the p
ur
chaser
shall promptly notify
MoseleyAssociates.
lnc
.. in writing. givingfull particulars as tothe defects.
Upo
n receipt
of
suchnotice.
Moseley Associates. lnc. will give instructions respecting the shipment
of
the equipment.
or
such other
manner as it elects
co
service this Warranty as above provided.
3.
This Warranty
extends
onlv
to t
he
ongmal p
urchaser
and
is
not
assignable or
transterable,
does
not exte
nd
to
any
sh
ipment
which has
been
sub
jected to abuse. misuse, physical
damage, alteration, operation
under
improper
conditions
or
improper
installation, use
or
maintenance.
and
does
not
extend
to
equipment
or
parts
not
manufactured
by
:v!oseley Associates, Inc.
and
such
t?quipment
and
parts
are
sub1ect to
only
adjustments
as
are
available from
the
manufacturer thereof.
4.
:--.lo
other
warranties, express or implied, shall be applicable to
any
equipment
sold
by
:vtoseley ...\ssociates. Inc.
and
no
representative or o
ther
person
is
authorized
by
Moseley...\ssociates.
Inc. to
assume
fo
r 1t
any
liability
or
oblig
ation
with respect to the
co
ndition or performance of
any
equipmentsold
by
it. except
as
provided inthis Warranty. This Warrantyprovides for the sole right
and
remedy
of
the purchaser and M0~eley Associates. Inc. shall in no event have any liability
fo
r
co
nsequential damages
or
for loss. damage
or
expense directly
or
indirectly arising from the use
of
equipment purchased from Moseley Associates.
Inc
.
MO
SELE
Y
ASS
OCIAT
E$
.
INC
.
., =L
ow
::.
e:
N
E'-•
L COMPANY
SANTA
BARBARA
RESEARCH
0
AR
K
1
11
CASTILIAN ORIVE
GOL
ETA CALIFORN
IA
93017
TE
LE
Pl-iONE 1
8051
968-9621
TELEX· 6584'8 C
ABLE
.
MOSELEY
www.SteamPoweredRadio.Com
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TABLE
OF
CONTENTS
Section
List
of
Illustrations
1
SYSTEM
CHARACTERISTICS
1.1
1.2
1.3
1.4
1.5
Introduction
System
Specifications
Operation
1.3.1
Introduction
1.3.2
Remote
Terminal-General
Comments
1.3.3
Remote
Terminal-Channel
0
Operation
1.3.4
Remote
Terminal-Channel
1-16
1.
3
.5
1.3.6
1.
3.
7
1.3.8
1.
3.
9
Operation
Failsafe
Remote
Terminal
Setup
Final
Notes
on
the
Remote
Terminal
Control
Terminal
Operation
Notes
on
Recovery
After
Power
Failure
1.3.10
Notes
on
the
Subaudible
Option
1.3.11
Summary
of
MRC-1600
Operation
Operation
-
CRT
Option
1.4.1
Introduction
1.4.2
Format
of
Display
1.4.3
Operation
from
the
CRT
Keyboard
1
.4
.4
CRT
Text
Setup
1.4.5
Interactions
with
the
Logging
Option
1.4.6
Summary
of
CRT
Key
Commands
Operation
-
Logging
Option
1.5.1
Introduction
1.5.2
Log
Page
Format
1.5.3
Logger
Setup
1.5.4
Logger
Error
Messages
1.5.5
Logger
Operation
1.5.6
Summary
of
Logger
Commands
2
INSTALLATION
2.0
Introduction
2.1
Unpacking
2.2
Line
Voltage
Selection
2.3
Preinstallation
Checkout
MRC-1600
-i-
-iv-
1-1
1-1
1-1
1- 6
1- 6
1
-6
1-7
1-8
1-
10
1-10
1-14
1-15
1-16
1-16
1-17
1-21
1-21
1-21
1
-22
1-
23
1-23
1-
25
1-28
1-28
1-28
1-28
1-31
1-31
1-32
2-1
2- 1
2-1
2-1
2-2
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S
ec
tion
2
3
4
5
I NSTALLATION
(cont.)
2
.4
Remote
and
Control
Communications
Interconnections
2.5
2 . 6
2.7
2.8
2 . 9
2.10
2.11
2.4.1
Telco
Interconnect
2.4
. 2
Subcarrier
and
Subaudible
Interconnects
2.4.3
Mixed
Interconnects
2.4.4
RS-
232
Interconnect
System
Checkout
Physical
Installation
Audible
Alarm
Analog
Inputs
Status
Inputs
Relay
Outputs
2 .
10.1
Raise
and
Lower
2.10.2
Maintenance
and
Override
2.
10.3
Failsafe
CRT
and
Logger
Options
2.11.1
Chassis
Preparation
2
.11.
2 CRT
2.11.3
Logger
MOSELEY
ASSOCIATES GENERAL INFORMATION
3.1
Equipment
Issue
Identificati
on
System
3.2
Customer
Service
Informa
tion
SYSTEM
DESCRIPTIVE
INFORMATION
4.1
Introduction
4.2
General
Descrip
tion
MODULE
CHARACTERISTICS
5.1
Introduction
5
.2
Power
Supply
5
.3
Central
Processor
5 . 3 . 1
MPU
5
.3
. 2
Address
Decoding
5
.3.3
System
I/O
5.3.4
Reset
Circuitry
5.3.5
Modem
I/O
5
.3.6
RS-
232
I/O
5
.4
Analog/Command/Status
5.5
Front
Panel
5.6
External
Relay
5.7
Communications
I/O
MRC-1600
-
ii-
2- 3
2-3
2
-6
2-
10
2-10
2-
12
2-12
2-
12
2
-12
2-
15
2-15
2
-15
2-15
2-
15
2-
16
2-16
2-
16
2
-17
3- 1
3-1
3
-2
4-1
4- 1
4-1
5- 1
5-1
5-1
5
-1
5-2
5- 2
5-3
5- 4
5-5
5-6
5-6
5- 7
5 - 7
5- 8
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Section
5
MODULE
CHARACTERISTICS
(cont.)
6
7
5.8
5.9
5 .
10
Data
Modems
5 .
8.1
Telco
Input
5.8.2
Telco
Output
5 .
8.3
Subcarrier
Input
5.8.4
Subcarrier
Output
5.8.5
Subaudible
Input
5.8.6
subaudible
Output
RS-232
Communications
Board
RS
-
232
Communications
I/O
ALIGNMENT
AND
TROUBLESHOOTING PROCEDURES
6.1
Introduction
6.2
Equipment
Required
6.3
Dr
awings
Required
6.4
Alignment
and
Troubleshooting
Procedures
6.4.1
Telco
Input
and
Telco
Output
6.4.2
Subcarrier
Input
and
Subcarrier
Output
6 . 4 . 3
Subaudible
Input
and
Subaudible
Output
6.4.4
RS-
232
Communications
6.5
General
System
Troubleshooting
RECOMMENDED
SPARES
MRC-1600
-
iii
-
5- 8
5-8
5- 9
5-
10
5
-1
1
5-
11
5
-12
5-12
5-
13
6- 1
6- 1
6- 1
6
-1
6-1
6- 1
6- 3
6
-6
6- 7
6- 8
7- 1
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Figure
1- 1
1-2
1- 3
1- 4
2- 1
2- 2
2- 3
2- 4
2- 5
2- 6
2- 7
2- 8
2- 9
2-
10
2-
11
MRC
-
1600
LIST
OF
ILLUSTRATIONS
Pag
e
MRC-1600
Front
Panel
1- 5
Viewpoint
A2
Keyboard
1-26
Typical
CRT
Option
Display
1-27
Sample
Log
Page
1- 33
2-
Wire
Telco
Communications
Configuration
2- 4
4-
Wire
Telco
Communications
Configuration
2- 5
Subcarrier/Subaudible
Communications
2- 7
Configuration
Mixed
Communication
Configuration
(
Case
1)
2- 8
Mixed
Communication
Configuration
(Case
2)
2-9
Alarm
Buzzer
Muting
Configuration
2-13
External
Alarm
Configurat
i
on
2-14
Status
Input
Interfacing
2-
18
Relay
Output
Interfacing
Relay
-
Relay
Interfacing
Setup
Worksheet
-
iv
-
2-
19
2-
20
2-
21
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A/0
CMOS
CPU
EPROM
FSK
IC
LEO
Modem
NC
EEROM
RAM
ROM
SCA
Status
Telco
Telemetry
THD
TTL
MRC-1600
GLOSSARY
analog
to
digital
complementary
metal-oxide
semiconductor
central
processing
unit
erasable,
programmable
,
read-only
memory
frequency
shift
keying
integrated
circuit
light-emitting
diode
FSK
modulator/demodulator
normally
closed
(contact)
normally
open
(contact)
electrically-erasable
read-only
memory
random-access
memory
read-only
memory
Subsidiary
Communications
Authority
On/Off
(Go/No
Go)
input
to
Remote
Terminal
representing
an
occurence
of
interest,
such
as
doors
opening,
transmitter
over-
loads,
fire,
etc.
External
interfacing
is
normally
required,
providing
a
contact
closure
(or
opening)
to
the
MRC-1600.
Telephone
Company,
refers
normally
to
a
Series
3002
basic-conditioned
data
cir-
cuit
or
equivalent.
Varying
analog
voltage
input
representing
a
metering
function
not
normally
input
directly,
i.e.
3.0
Vdc
may
represent
a
plate
voltage
of
7500
volts
in
a
trans-
mitter.
External
int':!rfacing
may
be
required.
total
harmonic
distortion
transistor-transistor
logic
-v-
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SECTION 1
SYSTEM
CHARACTERISTICS
1.1
INTRODUCTION
The
Model
MRC-1600
Microprocessor
Remote
Control
System
is
designed
to
provide
the
ability
to
monitor
and
control
broadcast
transmitters
and
similar
installations
from
a
remote
location.
It
provides
sixteen
"telemetry"
channels,
which
are
digital
displays
of
analog
input
voltages.
Four
digits
plus
decimal
point
and
sign
are
provided.
There
are
sixteen
status
(on-off)
displays;
each
is
an
LED
which
is
lit
or
not
according
to
the
presence
or
absence
of
an
external
contact
closure.
There
are
thirty-two
relay
outputs
(
sixteen
raise-lower
pairs)
which
may
be
activated
by
the
user
by
selecting
a
channel
and
pushing
the
RAISE
or
LOWER
button
on
the
front
panel.
Intercommunication
between
Control
and
Remote
Terminals
may
be
by
leased
telephone
line
(2-wire
or
4-wire),
or
option-
ally
by
subcarrier
or
mixed
subcarrier
and
wire
systems.
Various
subcarrier
frequencies
are
available.
Microprocessor
technology
at
both
Control
and
Remote
Terminals
al
lows
advanced
standard
features
such
as
key
-
board
calibration,
tolerance
alarms,
plain
English
setup,
and
non-volatile
memory.
An
optional
CRT
Display
Option
may
be
added
to
the
Control
Terminal
only.
An
Auto-Logging
Option
may
be
added
to
the
CRT
Option
if
desired.
1 . 2
SYSTEM
SPECIFICATIONS
Type
of
System
Control
Failsafe
Failsafe
Output
MRC-1600
Microprocessor-based
Control
and
Remote
Terminals.
Complies
with
current
FCC
requirements
for
service.
Responds
after
failure
of
ing
circuit.
AM
and
FM
45
seconds
interconnect-
SPDT
relay
2
amperes
ductive.
contacts
(Form
C)
at
30
Vdc,
nonin-
1-1
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Alarm
Indications
Maintenance
Override
INTERCONNECTS
Classes
2-wire
and
4-wire
Subcarrier
Modulation
(Subcarrier/
2 W - 4
W)
Data
Rate
(Subcarrier/
2 W -4
W)
MRC-1600
Visual
and
aural
(both
Remote
and
Control
Terminals).
Aural
alarm
defeatable
and
remote-
able.
Remote
Terminal
front-panel
control
provides
Remote
Termi-
nal
relay
closure.
SPOT
relay
contacts
(Form
C) 2
amperes
at
30
Vdc,
noninductive.
LED
in-
dication
at
both
terminals.
2-wire
and
4-wire,
FM
sub-
carrier,
subaudible,
or
com-
binations
of
these.
600
ohm
balanced
line,
nominal
.
Series
3002
(basic
condition-
ing)
data
channel
per
Bell
System
Technical
Reference
PUB-
41004.
Send
level:
O dBm,
nomi-
nal.
Receive
level:
-30
dBm
nominal.
2200
ohm
unbalanced
line,
in/
out
nominal.
Send
level:
1.
5
V
p-p,
nominal
.
Receive
level:
0.25
V
p-p,
minimum.
Frequency
modulation
of
sub-
carrier
on
specific
frequency
between
26
kHz
and
185
kHz.
Two-tone
FSK.
1070/1270
Hz
wire
Remote
to
Control,
2025/
2225
Hz
wire
Control
to
Remote.
1070/1270
Hz
all
subcarrier.
300
bits/second
.
2-way
simul-
taneous,
full
duplex.
1-2
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Subaudible
Data
Format
COMMAND
FUNCTIONS
Number
of
Command
Lines
Inputs
Outp
uts
Response
Time
STATUS
FUNCTIONS
Number
of
Inputs
Inputs
Input
Filtering
Input
States
Indication
Response
Time
MRC
-160
0
2200
ohm
unbalanced
line,
in/out
send
level:
1.5
V
p-p,
nominal.
Receive
level:
0.25
p-p
minimum.
Two-tone
FSK
20-
25
Hz,
baud
rate
9.4
bits
per
second.
8-bit
data
byte
plus
in
a
11-bit
character
with
LRCC
and
parity
each
frame.
16
raise
and
16
lower.
Front
panel
raise
/low
er
buttons.
parity
frame,
bit
in
SPOT
(Form
C)
relay
contacts,
rated
at
30
Vdc,
2
amperes,
noninductive.
425
msec,
typical.
16
inputs
TTL-compatible
closures
at
the
Remote
terminal.
(3300
ohm
in
-
ternal
pull-up
resistors).
L-C
low-pass
filter
for
each
input.
User
programmable
for
N.O.
or
N.C.
contacts.
Front
panel
LEDs
at
Remote
and
Control
Terminals.
450
msec,
typical
from
=tatus
change
to
indication
at
Control
terminal.
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TELEMETRY
{ANALOG)
FUNCTIONS
N
umber
of
Channels
Inputs
Input
Impedance
Input
Filtering
.
Calibration
A/0
Measurement
Accuracy
Sample
Rate
Display
Response
Time
PHYSICAL
Power
{Command
and
Remote)
Operating
Temperature
Size
(W
X H X
D)
MRC-1600
16
inputs
.
Analog
±4
. 5
Vdc
maximum,
sin-
gle
ended
referenced
to
ground.
500
Kohm,
nominal.
L-C
low-pass
filter
for
each
channel.
Via
front
panel
switches
in
millivolt,
linear
,
power
or
indirect
power
mode . A
mini-
mum
of
0.
25
volts
required
for
ful
1
scale
calibration
(
9999)
to
maintain
stated
accuracy
.
One
part
in
4096
(
12
bits)
.
Better
than
0 .
5%
Greater
than
9
times/second
displayed
channel
.
4
digits
{
9999
counts,
maxi-
mum)
plus
sign
and
decimal
point.
Alphanumeric
setup
menu.
525
ms,
typical,
from
an
input
change
exceeding
±10
mV
to
be
displayed
at
the
Control
Termi-
nal.
120/240
Vac,
50/60
Hz,
30
w,
typical
.
0-50°C
19
" x 7 " x 9" {48 • 3
cm
x 17 . 8
cm
x
22
. 9 cm) .
1-4
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www.SteamPoweredRadio.Com
1.3
OPERATION
1 .
3.1
Introduction
We
suggest
that
t
he
reader
have
the
Control
and
Remote
Terminals
available
for
experimentation
while
reading
t
his
section.
Pushing
the
buttons
on
the
front
panel
cannot
damage
the
units
.
Place
the
Control
and
Remote
terminals
together
on
a
bench
or
tabletop,
and
connect
them
together
(using
wire
or
coax
cable
terminated
by
BNC
connectors,
depending
on
the
interconnection
options
you
have
ordered).
Check
ahead
to
section
2.
4
for
information
on
in-
terconnection,
section
2.2
for
line
voltage
selection,
and
section
2.3
for
preinstallation
checkout.
This
having
been
done
,
power
up
both
terminals
using
the
power
switch
located
inside
the
chassis
. You
will
have
to
open
the
front
panel
using
the
knurled
screw
to
do
this.
If
you
do
not
have
the
units
available
while
reading
this
section
,
Figure
1-1,
showing
a
front
panel,
is
provided
for
reference.
The
Control
and
Remote
terminals
have
identical
front
panels.
(You
can
tel
1
them
apart
by
looking
at
the
rear
of
the
units.
The
Remote
has
an
external
relay
board.)
As
one
might
guess
from
their
close
resemblance,
operation
from
the
Control
and
Remote
Terminals
is
very
similar.
The
Remote
Terminal
(which
is
the
unit
installed
at
the
trans-
mitter)
has
additional
setup
capabilities
.
We
will
first
describe
operation
at
the
Remote
Terminal,
then
describe
how
the
Control
Terminal
differs.
1 . 3 . 2
Remote
Terminal
-
General
Comments
The
alphanumeric
display
on
the
front
panel
always
pertains
to
one
of
the
nineteen
channels
(numbered
0
to
18).
When
the
Remote
Terminal
is
powered
up,
it
goes
to
channel
0.
Channel
0
is
tne
"power
saver"
channel;
after
ten
seconds
the
displays
are
turned
off
(except
for
the
RUN,
MAINT,
and
ALARM
LEDs ,
whose
significance
we
will
explain
later).
Any
time
a
button
is
pushed,
the
displays
are
turned
on
for
ten
seconds.
Only
channel
0
has
this
feature,
which
is
useful
if
you
are
using
an
uninterruptible
power
supply
(OPS)
containing
a
battery
.
MRC-1600
1
-6
www.SteamPoweredRadio.Com
To
select
a
different
channel,
push
the
-:-
or
+
button.
Each
time
you
push
the
button,
the
channel
number
is
incre-
mented
or
decremented.
Holding
the
button
down
will
cause
the
system
to
advance
(
or
retreat)
through
the
channels
continuously.
After
channel
18,
channel
u
is
selected
(and
vice-versa)
.
Channels
1-16
display
the
current.
value
of
the
sixteen
analog
("telemetry")
inputs.
Channels
17
and
18
are
measurements
of
the
performance
of
the
system.
Channel
17
is
a
test
of
the
A/D
(analog-to-digital)
converter.
The
A/D
reference
voltage
is
fed
through
the
input
amplifier
and
back
into
the
A/D
converter.
It
should
always
read
within
20
counts
of
2048.
Channel
18
is
an
indication
of
the
performance
of
the
interconnection
between
the
two
terminals.
The
first
two
digits
represent
the
quality
of
communications
(proportion
of
error-free
messages)
received
from
the
other
terminal.
The
second
two
digits
represent
a
report
from
the
other
terminal
on
the
communications
it
is
receiving
from
this
terminal.
If
this
terminal
is
not
re-
ceiving
communications
at
all,
the
second
two
digits
will
be
displayed
as
"XX",
indicating
that
the
conditions
at
the
other
terminal
aren't
known.
Each
of
these
data
qua
1i
ty
displays
is
a
number
from
00
to
99,
with
99
being
best.
1.3.3
Remote
Terminal
-
Channel
O
Operation
When
channel
O
is
selected,
meanings
than
those
marked
on
Remote
Terminal,
we
have:
the
the
keys
have
different
front
panel.
At
the
SETUP
and
OPPER
LIMIT
simultaneously:
Lamp
Test:
All
LEDs
and
all
segments
of
the
alpha-
numeric
display
are
lit
up.
SETUP
and
LOWER
LIMIT
simultaneously:
Audible
Alarm
Test:
The
front
p~nel
audible
alarm
is
sounded
as
long
as
the
keys
are
pressed.
Note:
You
must
install
the
enabling
jumper
on
the
rear
of
the
unit
before
the
alarm
will
sound.
Refer
to
section
2
for
information.
SETUP
and
RAISE
simultaneously:
MRC-1600
Audible
alarm
enable/disable.
Each
simultaneous
push
of
these
keys
reverses
the
status
of
audible
alarming.
The
LED
labeled
AUDIBLE
OFF
shows
the
current
status.
The
audible
aiarm
disable
func-
tion
does
not
disable
the
audible
alarm
test.
1-7
www.SteamPoweredRadio.Com
SETUP
and
LOWER
simultaneously:
Maintenance
override
enable/disable.
FCC
regu-
lations
require
that
only
one
point
at
a
time
in
a
Remote
Control
system
may
be
the
"control
point"
.
The
control
point
has
the
ability
to
execute
command
actions
.
In
the
Moseley
MRC
product
line,
when
the
Remote
Terminal
is
the
control
point
there
is
said
to
be
a
"Maintenance
override"
condition.
This
corresponds
to
the
local/remote
function
on
many
older
remote
con-
trols.
When a
maintenance
override
condition
exists,
the
MAINT
LED
is
lit
at
both
Control
and
Remote
Terminals.
The
RAISE
and
LOWER
keys
at
the
Con-
trol
Terminal
are
disabled
and
the
RAISE
and
LOWER
keys
at
the
Remote
Terminal
are
armed
. A
relay
at
the
Remote
Terminal
is
closed
when
the
system
is
in
a
maintenance
override
condition.
This
permits
the
connection
of
an
external
light
or
alarm
to
warn
personnel
to
remove
the
system
from
main-
tenance
override
mode.
before
leaving
the
trans-
mitter
plant.
MAINTENANCE
OVERRIDE
MAY
NOT
BE
ENDED
FROM
THE
CONTROL
TERMINAL.
Each
simultan-
eous
push
of
SETUP
and
LOWER
at
the
Remote
Terminal
while
channel
O
is
selected
reverses
the
current
state
of
maintenance
override
.
SETUP
and
ACK
simultaneously:
This
clears
all
alarms
at
once.
Various
condi-
tions
cause
alarms
in
the
MRC-1600.
These
will
be
described
later.
If
there
are
several
different
alarms
(for
instance,
several
channe
l s
go
out
of
tolerance)
the
alarms
wil
1
be
stacked.
Normally
each
alarm
will
be
displayed
in
turn.
(
Each
time
ACK
is
pushed
the
next
alarm
is
displayed.)
If
for
some
reason
you
do
not
want
to
step
through
all
the
alarms,
SETUP
and
ACK
pushed
simultaneous-
ly
while
on
channel
O
will
clear
all
the
alarms
.
1
.3.
4 Remote
Terminal
-Channel
1-16
Operation
The
preceding
key
combinations
pertain
to
channe
1
0.
For
channels
1-16
the
keys
have
the
following
effects
:
RAISE:
MRC-1600
Activates
the
RAISE
relay
associated
with
the
selected
channel.
1-8
www.SteamPoweredRadio.Com
LOWER:
Activates
the
LOWER
relay
associated
with
the
selected
channel.
RAISE
and
LOWER
at
the
Remote
Terminal
will
have
no
effect
un-
less
the
unit
is
in
maintenance
override
mode.
Maintenance
override
defeats
RAISE
and
LOWER
at
the
Control
Terminal
.
UPPER
AND
LOWER
LIMITS:
These
keys
are
u
sed
to
dis-
play
any
tolerance
limits
which
you
have
established
for
the
selected
channel.
(
These
1
imits
are
entered
via
setup
mode,
which
we
will
describe
later.)
The
limit
will
be
displayed
as
long
as
the
key
is
held
down.
A
display
of
O
indicates
that
no
limit
has
been
established
for
the
select-
ed
channel.
ACK
(Acknowledge):
This
key
is
used
to
acknowledge
alarms.
The
following
conditions
cause
alarms
at
the
Remote
Terminal:
Channels
1-16
out
of
user
established
tolerance
limits.
Status
alarms.
(You
may
establish
alarms
on
transitions
of
the
16
status
channels.
We
will
describe
how
to
do
this
later.)
I
Interruption
of
data
from
control
Term-
inal.
Channel
17
(A/O
test)
out
of
factory-
preset
tolerances.
When
one
or
more
of
these
conditions
occurs,
the
alarm
LED
flashes.
If
the
audible
alarm
has
not
been
disabled
(
via
SETUP
and
RAISE
on
channel
O,
described
previously)
and
the
enabling
jumper
has
been
installed
on
the
rear
panel,
the
audible
alarm
will
sound
also.
The
alarm
is
cleared
by
pushing
ACK.
The
appropriate
alarming
channel
is
selected
automatically.
(
In
the
case
of
loss
of
signal
from
the
Control
Terminal,
channel
18,
which
displays
data
link
performance,
is
selected.)
In
the
labeled
case
of
telemetry
tolerance
alarms,
the
red
LEDs
UPPER LIMIT
and
LOWER
LIMIT
are
lit
as
appro-
for
as
long
as
the
,nut-of-tolerance
condition
(These
LEDs
pertain
to
the
selected
channel
you
go
to
another
channel
that
is
not
out
of
they
will
go
out.)
If
an
alarm
conditions
ends,
priate,
persists.
only
.
If
tolerance,
MRC-1600
1-9
www.SteamPoweredRadio.Com
the
alarm
must
still
be
acknowledged.
The
affected
channel
will
be
selected,
but
the
tolerance
LEDs
will
not
be
lit.
If
several
alarms
have
occured,
the
alarms
will
be
stacked.
Pushing
ACK
clears
the
first
alarm.
After
a
four-second
delay
the
alarm
LED
wil
1
flash
again,
th~
audible
alarm
will
sound
if
it
has
been
enabled,
and
when
the
operator
pushes
ACK
the
next
alarm
channel
wil
1
be
selected
.
This
process
continues
until
all
of
the
alarms
have
been
cleared.
If
there
are
no
unacknowledged
alarms,
pushing
ACK
wil
1
select
channels
where
the
previously
acknowledged
alarm
condition
remains
in
effect.
If
there
is
more
than
one
such
channel,
each
channel
will
be
selected
in
turn
as
ACK
is
pushed
successively.
(You
must
wait
four
seconds
be-
tween
pushes.)
In
the
case
of
status
alarms,
the
alarm
channel
will
be
among
those
selected
until
the
next
status
transition
on
that
channel.
1.3.5
Failsafe
Another
provision
of
FCC
regulations
requires
that
"any
fault
causing
loss
of
control
will
automatically
place
the
transmitter
in
an
inoperative
position".
Therefore,
when
the
Remote
Terminal
senses
that
it
is
no
longer
receiving
data
transmissions
from
the
Control
Terminal,
the
"fail-
safe"
sequence
commences.
After
5
seconds
of
no
data,
an
alarm
is
sounded.
The
failsafe
LED
on
the
front
panel
flashes.
After
45
seconds,
the
LED
remains
on
steadily
and
the
failsafe
relay
opens.
This
relay
must
be
connected
to
make
your
transmitter
inoperative
if
you
are
within
the
jurisdiction
of
FCC
regulations.
As
soon
as
communication
from
Control
to
Remote
is
re-
established,
the
LED
goes
off
and
the
failsafe
relay
closes
again.
Putting
the
Remote
Terminal
in
maintenance
override
mode
will
also
end
failsafe.
1.3.6
Remote
Terminal
Setup
Channels
1-16
may
be
calibrated,
given
tolerance
alarm
limits,
etc.
To
do
this,
select
a
channel
(using
t
and
~)
and
push
SETUP.
When
you
are
in
setup
mode,
the
SETUP
LED
is
lit.
You may
think
of
setup
as
a
series
of
questions.
At
the
end
of
MRC-1600
1-10
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