Moseley MRC1620 User manual

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Technical Manual
MRC1620
REMOTE CONTROL SYSTEM
7A0325 Revision A
3 October, 1989
Moseley
Associates
Incorporated
Copyright 1989
111
Castilian
Dr
i
ve
Santa
Barbara
93117-3093
the trust'1d name in
eormttunkaljona
Phone
805
968
9621
Telex
658448
Fax
805
685
9638

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Copyright © 1989 by Moseley Associates, Inc.
All rights reserved •
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MRC 1620
MicroprocessorRemote Control .

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MRC 1620 SCADA System
'/he il!RC 1620 Remote Coutrol ism,
i11tel!(~e11t , iute};rated S11peruiso1:)' Cou -
trol aud Data Aq11isitiou (SCA DA J -~vstem
that oflersJlexihility u11d sophisticatio11
i11 nn eco110111ical a11d depe11da/Jle pack-
ap,e for ,{leneml rem o te> co11tro! {/P/Jliw -
tions
i11 the e11er;;_J '. 11/ility . /ra11spo11alio11
a11d te/eco111m1111icatio11 illllustries.
Configm·ation
The Ml {C 1620 system consi!ils of
a Remote Terminal that allows an
opt ion:il Control Terminal or IBM PC
with TaskMaster20 software to monitor
and control a remoIe facility from both
dedicated and/
or dial-up control
points. The
MRC 1620 Remote Termi-
nal comes equipped
with 32 relay iso-
lated command outputs
06 raise/ I6
lower). I6 1TL status inputs
ancl l6
analog metering inputs
with the
required
te rminal connectors.
Accessible
In broadcast applications. the sys-
tem may he configured
as a standard
Remote Control
with a Control Termi-
nal at the studio and the Remote Tcr-
min;-tl at the transmitter. The Remote
C ommunication
The Remote Terminal comes
equirped with a built-in internal 1200
baud modem to communicate o\'er
dedicated circui ts (S TL;TSIJFMSCA or
2 /. ➔ wire leased lines). An ext c.:rna l
1200, 2-
100 baud :Iuto-answer modem
for dial
-up access over th e public
sw itched telephone network is also
i
nc ludl'cl with the Remote Terminal.
This modem c:in he moved 10 the
Control
Te rminal should di al - up access
he a\'ailahlc
only at that location.
Set llp
System set up and ca libration are
done at the Remote Terminal with eight
color coded hullons. For each channel.
upper and lower telemetry limits may he
set or di sab l ed independently and ma y
be
cal ibrated in either pO\\Tr. indirect
pmver, linear
or microvoli mode. Status
inputs may he st: t 10 display di rect or
inverted and may he pr og r:immed to
trigger
an alarm on rising. falling. or ri~-
ing and fa lling "· ,w cfonns .
Non-volalik- memory is standard in
the MRC 1620. In the event of :1 power-
clown, all set-
up d;H:1. ca lihr :11ion and
limits ;Ire stored in an El
·: l'ROM ror up
Terminal may also he interrogated over 10 ten years.
dial-up lines usi
ng the TaskMaster20
sofrwarc and modems.
The TaskMas-
ter20 can also he used
to directly con-
nect a PC at the Control or Remme
Terminal for automatic logging and
automa
ti c controls.
Intelligence
Telemetry limi t che ck i ng and
status alarm capabil
ity ensure that an
unmanned facility operates at peak effi-
ciency. During alarm conditions,
intdli -
gent, automatic corrective action G
in be
taken by the Remote Terminal under
the direction
of the TaskMaster20.
Operation
The MRC 1620 Remote and Co111rol
Terminals are simple 10 operate and
easy
10 understand. All status channds
:ire simultaneously di
sp layed on a set
or 16 L EDs. The front panel displays
read
-o uts of selected channel number
and telemeny data. LFDs indicate
ore r-
ation mode.
ala rms and other sys tem
pa rameter s.
The MHC 1620 constantly checks
tclemet1y and
sta tus dat:1 for each
channel against assigned limits.
Olli of
parameter conditions immediately trig-
ger
an audible and visible alarm The
front panel :1 ll ows the operator to issue
commands
to either raise or l ower the
telemetry \'alues
to bring that channel
hack
wi thin limits. The telemetry and
status channels also have
:111 optional
mu
ting feature.
System Diagnostic!,
The MRC 1620 maintains two spe-
ci:il system test channel
s. Onl' checks
N Dconversions and pro\'ides an
alarm when tolerance exL·t·eds fac t ory-
se t limit s. The second gi\'es 1he user
read-outs
or data l ink quality.

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TaskMaster20 Software
◄ The TaskMaster20 software is an easy ro use software package
that allows
you to access a nd control yo ur Remote Terminal via
a PC and modem. Pull
down menus are ava ilable on each screen 10
assist you w it h operation of the TaskMastcr20.
◄ The sys'.em automatically boots 10 the Monitor
Sc reen tor the site I. D. th at yo u choose. Th e Mo ni-
tor Sc reen a ll ows yo u to view the parameters for a ll 16
status and telemelly channels.
Use this screen to issue
rai
se and l ower commands.
◄ C urr ent alarm co ndit io ns are di splayed
and acknowle
dg ed on the Ala rm Page.
Up to 20 of the latest alarms and ho urly log
data from the l ast 30 h ou rs can be logged at
yo ur convenien ce.
◄ A thr ee-tiered password c·J\lonitor"",
··Control" and
.. Mas te r"' ) e nvir on ment
protec
ts yo ur system. O nl y the "Master"· pass -
wo rd may change set- up information. Pro-
gram the Site Name and password
on the first
Set-u p Screen. Nine (9) auto-dial numbers are
also program,mble
to directly call out to a
TaskMaster
20 wh en alarm cond it ions occur.
You customize your
own channel and stat us labels
◄ on the second Set-up Screen . Remme set up a 11ribute s
ma y he uploaded or down loaded from the MRC 1620.
On ce you have entered your si te la b els. sta tus labels and
password information.
yo u can access any sire by simply
e
nt ering the site l.D. \\'ith the proper pa ssword.
◄ Program au to-contr ol information in the Auto Screen. Commands
ca n be set up 10 he issued when a telemetry value exceeds its
limit
s. Co mmands can al so he initiated from a change of status condition.

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Specifications
Gent · ral
Type of system:1\licn1prncl's,or-l x1sl'd Control and lkmott· frr111in : 1t,.
Failsafe:
• Co mplit·s \\'ilh rum:111 FCC rt·quirl'ml'nl,.
•
Rrsponcls ;1flt·r railurt· of interrnnnL"Cling cirrnil. l"~cr
prog1:1111111:1hle from l lll 9999 minutes (0 10 I(,<, hours). C:111 ht·
disabled.
Failsafe Output: lff Sl'DT rl'ia)' con1ac1., ( Form C). lA, 30 \'de.
111111-indur1i1 •e.
AJarm Indications: \' i~ual and aural (bo1h RT and CT) . Aural alarm
ddca1ahk and r L"11101ec1bk· .
Maintenan ce Ove rr ide: l ff only from 1xmd con1ml prol'idl's ! ff relay
dosure. Sl'DT rday ront;1
cb (Form C J, 2/\, 30 \' de. non-indunive.
lnu:n.onnc:ns
Classes:211 k;1,l'd lint: , !-' ,\I ,uhc1rri<:r orrnmhinmion.
2/4 wire:
• 600 oh111 lx1 1:tnced lillL' . nominal. Sl'nd kvd: 0 dllm. nominal.
• Recei1 ·e leld: - 30 dllm minimum.
• lkqui
rt·~ l'r>icl' gmdt· Sl'ril's -1 22 (2•wire) or Seril', - 12 0 ( 1-wirl')
lha,ic conui1ioning] d:11a d1annl'L I For111erly Serie., W02-
l ldl Sy,1ern Tedrnical Referenct· Pl 1H 100-t .l
Subcarr ier (O ptional):
• noo ohm nomi nal unlxtlann:d lint·. in & ou1 :St:11( 1 kvd :
1.W p-p. nomina l.
• lk, · <:il'<.: lc.:vel: ll .2'i \' p-p. n1ini111u111 . Frl'tJUl'ncy modulation of
~ubcarril'r on a specilk frequel1C) ' he111 l'l'n 2(, kl lz and !Wi kl1 7. .
Modulation: Tll'o lone FSK . 1200 220 0 I lz .
Data Rate: 12(\() hit, •. ,. llalfdupll'x.
Se ri al interface: RS - 252 l< )r dirt:cl or "AT" mo drn 1connenion lo PC
2• 100 or l 200 or 300 hit ., ,
Da ta Format (a ll ):8- hi1,. no parit)', I ,toJ) hit.
Command Iunc.tmn,
Numbe r of Ou tp uts: 16 ra ise and H, lower.
Input s: Frum r:mel raise l o;;,. •er hu1ron,.
Outputs: Sl'DT (Form C) relay contac 1,. 2A .. ,O\'ck. non•indurliw.
R es ponse Tim e: 'iOO 111 .,. 1ypic:1 I.
'italus Functions
N um ber of Input s: 16 input.,
Inputs: ' ITL-rnmp:11ible closures at the Remotl' Tcrmin;i l. (5, -\ 00 ohm
illlernal pull -up re',i,101~ ).
Input Filtering: l. ·C low-pa,s filler for l',JCh i np111.
Input Sta t es : l' s<:r prog1:1mniahlt· for 1\ ·.o. or N. C. rnnract>.
Indi ca ti o n: Frum r:111d gr<:<:n L EDs at RT and er.Changt•:1hk 1n r<.:d
R es ponse Tim e: Is, 11·picil, from srall!s change IO indication ,11 lh<: CT.
2'i0 ms , typical. whl'n rnmmanus an .: hl.:ing is~ued from till' CT.
felemetry (Analog) Fu nction~
N um berofCha nn e ls: I (1 input,
Inpu ts: An ,ilog ±-J .'i \'ck maximum, ,ingle ended referenced 11>
ground. Othl'r input, op1ion:1I .
lnput Impedance: 'iOO kOhm, nominal.
Input Filtering: 1. -C low p;1s, filti.:r for l'.td1 channel.
Calibrat ion: Via from pand butt on, in n1illivuh . linl'ar. po11er 1)r
indin:u power m11tll' . A minimum of0.2'i voh, requirrd for lull - srak
calil11:11ion (99991 to m:1i111ain Mated acn 11 : Ky .
AID: On e part lll - 1096 (12 bi1s + .,ign)
Meas ur em en t Acc urac y: lk:lter 1han O.'i%
Sa mpleRa te: Greatc:r than 9 times sl'cond on di.,plared channd.
M ose l ey
Associates
Incor p orated
Response Time: Is, 1ypi G tl , fr om an inpu1 ch:ingl' : 11 lhl' llT 10 indic:ninn al
lilt' CT. 2'i()m,, typi c: 1I. wlx:n cn111111and s : 1rl' being b,Ul' ti from 1he CT
Physkal
Power (C J' or RT ): IOO 11 0 22 0 .rn J,210 V:1c 'i0 /60 l lz. 30 W. 1ypictl.
Operating Tem peratu re: 0-'i( IC
Size (WxHxD): · 19 l'lll x !Hem x 2.~rnl 129 " x .., .. x 9"I
Optinrn,
TaskMa-, ter20: Singll'-,ill' , \-IH C 1( 120 PC Soft11art • requi1'l' , llli\l PC XT
l'quiv; 1k111 or hellL'L
MasterControll er: 1\lulti-site ~IR C lh20,i\lRC 2 PC :-,01iw : 1re rl'quires IB , \,I
PC 11 \T o:qui1all'lll or hL'lll 'f
Subc ar ri er Co mmunications: A1 · aibhk on ~tand:1rd freque ncie s from 16 10
185 kllz
Task.\1a . ,tcr 20
Hard~· -1 1 ·<.· Rc<1uirrnu: n1,
Minimum Upgrade
Co mputer
• IBM PC /X T or • 286 /5 86-has<:d compalihil'
PS ,2
• 320KB Rt\M • 6· 10KB R AM or more
•
St:ri:tl 1'011
• Par;tlld Pri nti.:r l'orr
•
360KB Flopp)' Disk D1ive • 1. .2~113 or 72 0 Kl3 or 1.- HMll
• 20MB 11:!rd Di . ,k
• - 10~11! I lard Disk or more
• Color Graphics Atbptcr •
EGA or VGA C:tJ):thi l il) '
Monitor
• CGA Monitor
Mod em
• 1200 h:1ud
• Hayes "t\T" comp, 11iblc.:
1111<.:rnal or cx1crna l
Print er
. ,,.,
• 1 13~1 comp;lli hlt.: par,1 llc! prinll'r
Cab l es
• Parnlle l printer ,:1blc
•
Nlcxlc111 cahk if using external modem
•
Null - m<xlem cable if using direct con nec1
00 S
• Version 3.0 or larer
Software Features
• Dia l or di r ec1 connect lo :u1 MRC 1620 Remote orConrrol lbminal.
• Display current analog and s1all!s value~.
• Display and Hcknowledge alar ms.
• Ma nm1 lly control an MRC 1620 Remote Termi nal (RT) .
•
Au10111arically cornrol (via :111alog limitti and Slall!s con di1ions) an RT.
• Display , edi1 , and store l'C screen l:1bcb.
• Down load :ind Slur<.: 1hc sci-up parameters from 1he MRC 1620.
• Recall :md upload the set-up parameters to the MRC 1 620 .
• Maintai n and gl'nerme log f il e(s) from up to 16 HT si1rs al uscr- ~pecil1rd
intervals during the day .
• Ge 11 ern1e a printed log.
11 1 Castil i an Dri ve
Sa nt a Barbara. CA
93 1 17-30 93
a
Flow Gene ra l
Com p any
Phone: [phone]
Telex :65 8448
FAX : [phone]

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WARNING
This equipment complies with the requirements in Part 15 of FCC Rules for a
Class A computing device. Operation of this equipment in a residential area may
cause unacceptable interference
to radio and TV reception requiring the operator
to take whateversteps are necessary to correct the interference.
MRC1620
7A0325 Rev A ii

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WARRANTY
All equipment designed and manufactured by Moseley Associates. rnc is warranied agains1 defec1s
in workmanship and materiol that develop under normal use within a period of (2) years from th e date of
original s hi pment. and is also warranted to meet any specifications represented in writing by Mo seley
Associates, Inc., so long as the purchaser is not in default under his contract of purchase and subject to th e
following additional conditions and limitations:
I. The sole responsibility of Moseley Associates. In c. for any equipment notconforming to this
Warranty shall be, at its option:
A. to repair or replace suchequipment or otherwisecause it to meet the representedspecifications
either at the purchaser 's installation or upon the return thereof f_o .b. Santa Barbara, California, as
directed by Moseley Associates. Inc.; or '
B. to accept the return thereofLo. b. Santa Barbara, California. creditthe purchaser's account for
the unpaid portion, ifany, of the purchase price. and refund to the purchaser. without interest. any
portion of the purchase price theretofore paid; or
C. to demonstrate that the equipment has no defect in workmanship or material and that it meets
the represented specification, in which event all expenses reasonably incurred by Moseley Associ-
ates, In c.. in so demonstrating. includingbutnot limited to costs of travel toa nd from the purchaser's
ins tallation, and subsistence, sha ll be paid by purchaser to Moseley Associates, Inc.
2. In case of any equipment thought to bedefective. th e purchas er sha ll promptly notify Moseley
Associates, In c., in writing, giv in g full particulars as to the defects. Upon receipt of such notice, Moseley
Associates. In c. will give in structions respecting the shipment of the equipment, or such other manner as it
elects to service this Warranty as above provided.
3. ThisWarranty extendsonly to the original purchaserand is notassignableortransferable. does
not ex.lend to any shipment which has been subjected to abuse. misuse, physical damage, alteration. operation
und er improper conditions or improper installation. use or maintenance. and does not ex.tend to equipment or
parts not manufactured by Moseley Associates, Inc. ant! such equipment and parts are subject to only
adjustments as are available from the manufacturer thereof.
4. NO OTHER WARRANTI ES. EXPRESS OR IMPLIED. SHALL BE APPLICABLE TO ANY
EQUIPMENT SOLD BY MOSELEY ASSOCIATES, I NC. AND NO REPRESENTATIVE OR OTHER
PERSON IS AU THORIZED BY MOSELEY ASSOCIATES, INC. TO ASSUME FOR IT ANY LI AB ILITY
OR OBLIGATION WITH RESPECT TO THE CONDITI ON OR PERFORMANCEOF ANY EQU IPMENT
SOLD BY IT, EXCEPT AS PROVIDED INTHIS WARRANTY. THIS WARRAN TY PROVIDES FORTHE
SOLE RIGHT AND REMEDY OF THE PURCHASER AND MOSELEY ASSOCIATES. INC. SHALL IN
NO EVENT HAVE ANY LIABILITY FOR CONSEQUENTIAL DAMAGES OR F OR LOSS. DAMAGE OR
EXPENSE DIRECTLY OR INDIRECTLY AR IS ING FROM THE USE OF EQUIPMENT PURCHASED
FROM MOSELEY ASSOCIATES INC.
MRC1620
7A0325 Rev A
iii
10 87
Prlnled In U.S.A.

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TABLE OF CONTENTS
Sec tion
2
FCC Part 15 Information
Warranty Information
Table of Contents
List
of Illustrations
Glossary
SYSTEM CHARACTERISTICS
1.1
Introduction
1.2 System Specifications
1.3 System Description
1.3.1 Central Processor
1.3.2 Front Panel
1.3.3 Power Supply
1.3.4 Data Modems
1.3.5 External Relay (Remote Onl
y)
1.3.6 Analog/Status/Command (Remote Only)
1.3.7 Communications 1/0
INSTALLATION
2.1
2 .2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
2.10
2. 11
2.12
Introduction
Unpacking
Line Voltage Selection
Site Selection
Pre-installation Checkout
RT and
CT Communications Interconnections
2.6.1 Telco Interconnect
2.6.2 Subcarrier Interconnect
2.6.3 Mixed Interconnects
System Checkout
Physical Installation
Audible Ala
rm
Analog Inputs
Status Inputs
Re lay Outputs
2.
12.1 Raise and Lower
2.12.2 Maintenance Override
2.12.3 Failsafe
MRC1620
7A0325 Rev A
IV
Page
ii
iii
iv
vi
vii
1-1
1 -2
1-5
1-5
1-5
1-5
1-5
1-6
1-6
1-6
2-1
2-1
2-1
2-2
2-2
2-3
2-3
2-4
2-5
2-6
2-8
2-8
2-10
2-10
2-10
2- 12
2-12
2-12

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• 3
4
• 5
6
7
8
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OPERATION
3.1 Remote Terminal Operation
3.1.1 General Comments
3.1.2 Channel 0
3.1.3 Channels 1-16
3.1.4 Failsafe
3.2 Remote Terminal Set
Up
3.2.1 Channels 1-16
3.2.2 Channel 18 -- Header & TrailerBytes
3.2.3 Channel
19 --Failsafe
3.3 Final Notes
on the Remote Terminal
3.4 Control Terminal Operation
3.5 Summary of Operations
MODULE CHARACTERISTICS
4.1 Introduction
4.2 Power Supply
4.3 CPU
4.4 Front Panel
4.5 Analog/Command/Status
4.6 External Relay
4.7 Communications 1/0
4.8 Data Modems
4.9 Cable Assemblies
ALIGNMENT PROCEDURES
5.1 Introduction
5.2 Test Equipment
5.3 Alignment Ptocedures
5.3.1 Telco Input and Output
Subcarrier Input and Output
5.3.2
5.4
General SystemTroubleshooting
CUSTOMER SERVICE INFORMATION
RECOMMENDED SPARES
SCHEMATICS AND ASSEMBLIES
MRC1620
7A0325 Rev A V
3-1
3-3
3- 3
3-4
3-5
3-5
3-6
3-8
3-9
3-9
3-9
3-10
4-1
4-1
4-1
4-4
4-5
4-5
4-5
4-6
4-7
5-1
5-1
5-1
5-1
5-2
5- 4

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LIST OF ILLUSTRATIONS
Figure
1-1 MRC1620 Block and Level Diagram
2-1
2-Wire Te l co Communications
2-2 4-
Wi re Telco Communications
2-3 Subcarrier Communications
2-4 Mixed
Comm unications (Case 1)
2·5 Mixed Communications (Case 2)
2·6
Set Up Worksheet
2·7 Alarm
Buzzer Muting
2-8
External Alarm
2-9
Sta t us Input Interfacing
2-10 Relay Output Interfacing
2-11 Relay-Relay Interfacing
3·1 MRC1620 Front Panel
5-1 FM/FSK Modulation
8-1
Power Supply Schematic
8·2
Cent ral Processor Sc hematic
8·3
Cent ral Processor Assembly
8-4
Front Panel Schematic
8·5
Front Panel Assem bly
8-6
Analog/Command/Status Schematic
8-7 Analog/Command/Status
Assemb ly
8-8
External Relay Schematic
8-9 External Relay Assembly
8-10 Communications 1/0 Schematic
8-11 Communications 1/0 Assembly
8-12 Telco I
nput Schematic
8-
13
Telco Input Assemb ly
8·14
Telco Output Schematic
8·15
Telco Output Assembly
8·16
Subcarr i er Input Schematic
8-17 Subcarrier Input Assembly
8-18
Subca rr ier Output Schemat ic
8- 19
S ub carrierOutput Assembly
8·
20
9F-2 5M Mode m Ca ble Schematic/Assembly
8-
21
9F-25F Null M odem Cab le Schematic/Assembly
8·22 9F
-9F Nu ll Mod em Cab le Schematic/Assembly
MRC1620
7A0325 Rev A
vi
Page
1-7
2
-3
2-4
2·4
2·5
2-6
2-7
2·8
2-9
2-10
2-11
2·11
3
·2
5-1
8-3
8-4
8·5
8-10
8-11
8-14
8-
15
8-20
8- 21
8·24
8-25
8·28
8-29
8-32
8-33
8-
36
8-37
8-40
8- 41
8·
44
8· 46
8-48

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A/0
CMOS
CPU
EPROM
EEPROM
FSK
IC
LED
Modem
NC
NO
PSTN
RAM
ROM
SCA
Status
Telco
Telemetry
THO
TTL
MRC1620
7A0325 Rev A
GLOSSARY
Analog
to
digital
Complementary metal-oxide semiconductor
Central processing unit
Erasable, programmab
le
, read-only memory
Electrically-erasable, programmable, read-only memory
Frequency shift keying
Integrated circuit
Light-emitting diode
MOdulator/DEModulator
Normallyclosed (contact)
Normally open (contact)
Public Switched Telephone Network
Random-access memory
Read-only memory
Subsidiary Communications Authority
On/Off (Go/
No
-
Go
) input to the Remote Terminal representing
an
occurrence of interest, such as doors opening, transmitter overloads, fire,
etc. External interfacing is normally required, providing a contact closure
(or
an opening)
to
the MRC1620.
Telephone Company, here refers normally to a Series 3002 basic-
conditioned data circuit
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 transmitter. External interfacing may be required.
Total harmonic distortion
Transistor-transistor logic
vii

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----
SECTION 1
SYSTEMCHARACTERISTICS
1.1 Introduction
The Model MRC1620 Remote Control System is designed to provide the ability to monitor and
control broadcasttransmitters and similar installations from remote locations.
It provides sixteen analog "telemetry" channels, which are digital displays of analog input
voltages. Fourdigits 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 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 pressingthe RAISE or LOWER button on the front panel.
The MRC1620 allows a variety of configurations to be used:
1. Remote Terminal (RT) and Control Terminal (CT).
2. RT and Personal Computer (PC) as the Control Terminal.
3.
RT and CT with a PC connected to the RT.
4.
RT and CT with a PC connected to the CT.
5. RT and CT with a PC connected to both the CT and RT.
Intercommunication between Control and Remote Terminals
may be by leased telephone line (2-
wire
or 4-wire), or optionally by subcarrier or mixed subcarrier and wire systems. Various
subcarrierfrequencies are available.
The PC may
be connected directly (with leased lines, subcarriers, or RS-232) or via the Public
Switched Telephone Network (PSTN/Dialup)
at either the RT or CT. For use with a PC, it is
necessary to use TaskMaster20 (tm) or MasterController (tm) software available from Moseley.
This manual discusses the RT-CT configuration and setup. Operation
of the TaskMaster20 or
MasterController software is described in a separate manual.
Microprocessor technology
at both Control and Remote Terminals allows advanced standard
features such
as single-person keyboard calibration, tolerance alarms, and non-volatile memory.
MRC1620
7A0325 Rev A
1-1

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1.2 System Specifications
Type of System
Failsafe
Failsafe Output
Alarm Indications
Maintenance
Override
Interconnects
Classes
2-wire and 4-wire
Subcarrier
(Optional)
Modulation
Data Rate
Serial Interface
Data Format (all)
Command Functions
Number of Outputs
Inputs
Outputs
Response Time
Microprocessor-based Control and Remote Terminals.
Complies with current FCC requirements.
Responds afterfailure of interconnecting circuit. User-
programmable from 1 to 9999 minutes (0 to 166 hours). Can be
disabled.
RT SPOT relay contacts (Form C} 2A,
30 Vdc, noninductive.
Visual and aural (both RT and CT}. Aural alarmdefeatable
and
remoteable.
RTonlyfront-panel control provides RT relay closure. SPOT
relay contacts (Form C} 2A, 30 Vdc, noninductive. LED
indication at both RT and CT.
2-wire
or 4-wire leased-line, FM subcarrier, or combination.
600 ohm balanced line, nominal. Send level: 0 dBm, nominal.
Receive level: -30
dBm minimum.
Requires Voicegrade Series 422 (2-wire} or Series 420 (4-wire}
[basic conditioning] datachannel. {Formerly Series 3002--Bell
~ystem Technical Reference PUB-41004.}
2200
ohm nominal unbalanced line, in & out. Send level: 1.5V p-
p, nominal. Receive level: 0.25 V p-p, minimum. Frequency
modulation of subcarrieron a specific frequency between 26 kHz
and 185kHz.
Two-tone FSK. 1200/2200 Hz.
1200 bits/s. Half duplex
RS-232 fordirect or "AT" modem connection to PC
2400 or 1200 or 300 bits/s.
8-bits, No parity, 1 stop bit.
16 raise and 16 lower.
Front-panel raise/lower buttons.
SPOT (Form C) relay contacts, 2A, 30 Vdc, non-inductive.
S00ms, typical

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-----~
,,,,.--...,_
Status Functions
Number of Inputs
Inputs
Input Filtering
Input States
Indication
Response
Time
Telemetry (Analog) Functions
Number of Channels
Inputs
Input Impedance
Input Filtering
Calibration
AID
Measurement
Accuracy
Sample Rate
Display
Response
Time
Physical
Power (CT or RT)
Operating
Temperature
Size
(W X H X D)
Options
TaskMaste r20
MasterController
MRC1620
7A0325 Rev A
16 inputs
TTL-compatible closures at
the Remote Terminal.
(3300
ohm internal pull-up resistors).
L-C low-passfilter
for each input.
User programmable for N.O. or N.C. contacts.
Front-panel Green
LEDs at RT and CT. Changeable to Red.
1s, typical
from status change to indication at the CT.
250ms , typical when commands are being issued from the CT.
16 inputs.
Analog+/- 4.5 Vdc maximum, single ended referenced to
ground.
500 kOhm, nominal.
L-C low-passfilter
for each channel.
Via front-panel buttons in millivolt, linear, power or indirect power
mode. A minimum of 0.25 volts required for full-scale calibration
(9999)
to maintain stated accuracy.
One part in 4096 ( 12 bits + sign).
Betterthan
0.5%
Greater than 9 times/second on displayed channel.
4 digits (9999, maximum) plus sign
and decimal point.
Alphanumeric
setup menu.
1s, typical,
from an input change to display at the CT.
250ms , typical when commands are being issued from the CT.
100 /120/220/230/240 Vac, 50/60 Hz, 30 W, typical.
0-50
oc
49 cm x 18 cm x 23 cm (19" x 7" x 9")
Single-site
MRC1620 PC Software
requires IBM PC/XT
or equivalent or better
Multi-site MRC1620/MRC-2 PC Software
requires IBM PC/AT
or equivalent or better
1-3

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Subcarrier
Communications Available
on standard frequencies from 26 to 185 kHz
Specifications subject to change without notice.
MRC1620
7A0325 Rev A 1-4

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1.3 System Description
The Control and Remote Terminals consist of several printed circuit modules which share the
processing load. Although the Remote and the Control Terminals perform different functions,
they are very similar electrically and mechanically: most of the boards appearing in one are
identical to the boards appearing in the other. The only exceptions are the
Analog/Command/Status board and the External Relay board which are installed only in the
Remote Terminal. The following text describes a typical MRC1620 terminal in a "building-block"
format. Forspecific circuit details, see Section 4, Module Descriptions.
The MRC1620 Remote Terminal consists of seven modules: Power Supply, CPU, Front Panel,
Communications 1/0, Data Modems, Analog/Command/Status, and External Relay board. The
Control Terminal omits the Analog/Command/ Status and External Relay boards. The text below
describes in general terms the purpose of these individual modules and their interaction with
other modules. For a complete circuit description of the modules, see Section 4.
1.3.1 CPU
This board is the heart of the MRC1620 terminal and is located directly behind the front-panel
printed circuit board. It holds the Motorola 6809 Microprocessor, the program instructions in
EPROM, the RAM, the setup parameters in EEPROM, some interfacing logic for communication
with the other modules in the system, and the RS-232 port. Most communication between
modules is done through an external 1/0 address bus and 1 /0 data bus. When the CPU board
wants to communicate with another board, it puts an address on the 1/0 address lines IOAB1-
IOAB4. If the operati on is a Read, the addressed module puts data on 1/0 data lines IODB0-
IODB7, which is read by the CPU board. For a Write operation, after placing the address on the
1/0 address lines, it puts data on the 1/0 data lines and strobes the *WASTA writestrobe line.
The addressed module then receives the data from the 1/0data bus.
In addition to the CPU board signals, there are signals which are generated externally that the
Processor Board routes to other modules; for example, power lines such as RELAY +15,
ANALOG +15, ANALOG -15, and +5.
1.3.2 Front Panel
The Front Panel board is responsible for interfacing operator-oriented functions with the CPU
board and is mounted directly on the chassis' front panel. It communicates with the CPU board
over the 1/0 bus and uses no other signals. The LEDs can be changed from green to red by
reversing their polarity.
1.3.3 Power Supply
The Power Supply accepts ac line voltage, and supplies +15 Vdc, -15 Vdc, and +5 Vdc to the
other modules. It is located within the MRC1620 chassis itself. Depending upon the
configuration of the Corcom filter, the ac line voltage input may be 100 Vac, 120 Vac, 220 Vac, or
230/240 Vac (user selectable).
1.3.4 Data Modems
The Data Modems are a family of devices which are used to communicate data between the
Control and Remote Terminals. These devices are attached to the CPU board via two
connectors. Essentially, there are three types of data modem: Telco, Subcarrier, and
Subaudible. Each terminal may be configured with any combination of these. In addition, if the
system is to be run overTelco line exclusively, it may be configured for2-wire or 4-wire operation.
The Data Modems are comprised of two sections: a transmitter, and a receiver, each on its own
printed circuit board. The purpose of these modems is to interface serial data used by the CPU
board to and from FSK carrier modulation. For Telco interface, the frequencies lie within the
audio region. Subcarrier board frequencies are available in a variety of standard frequencies
ranging from 26 kHz through 185 kHz.
MRC1620
7A0325 Rev A 1-5

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In addition
to
modulating
and
demodulating signals, the modem boards also select
the
data
rate
at which information
is
to be conveyed. Baud rate selection is accomplished
by
connecting any
one
of
the 6
data
clocks to the receive
data
clock RXCLK,
or
the transmit data
clock
TXCLK, as
appropriate. This connection is done automatically
on
each transmit
or
receive board.
The
Telco
and Subcarrier boards operate at 1200 baud using
the
19200 Hz
clock
line supplied
from
the
CPU board. Other signals such as
"DCD
, *CTS, and
"ATS
are used to pass modem status
signals
to
and
from
the
CPU board.
1.3.5 External Relay (RT Only)
The External Relay board accepts the 16 analog voltage samples and the
16
status inputs, and
presents them to the Analog/Command/Status board
for
further processing. It is mounted
on
the
outside of the Remote Terminal's
rear
panel. Since the analog inputs are single-ended,
AD1
-
AD16 carry the analog samples, and AGND carries the common signal; ST1-
ST16
carry the
status information. In addition to accepting
data
, the External Relay board provides a
set
of
34
r
el
ay contact closures. Each channel has a RAISE contact and a LOWER contact. They are
activated when the appropriate CHnnR
or
CHnnL line is driven to ground. The Failsafe
and
Maintenance Override relays are activated by low levels
on
the FAILSAFE and
MAINT
lines.
1.3.6 Analog/Status/Command
(RT
Only)
The
Analog/Command/Status board is a multipurpose module which interfaces the CPU board
and the External Relay board.
It
is located inside the chassis, and is mounted
on
the rear panel.
Like most of the other boards which communicate with the CPU board, the
Analog/Command/Status board passes data back and forth
over
the 1/0 bus. Perhaps the most
important function
of
the Analog/Command/Status board is the Analog to Digital conversion of the
analog sample channels. Following several commands from the CPU board,
the
AID
converter
indicates its state
of
readiness using
the
line •ADRDY. When a conversion is complete, the CPU
board rese
ts
the
AID,
and selects the next analog sample channel.
1.3.7 Communications 1/0
The Communications 1/0 board is quite simple since itcontains no active components, but still is
important. It serves
as
the gateway
for
all communications directed towards the other terminal
and PC, and contains various circuitry designed
to
protect the MRC1620 from any high voltage
surges over the Telco lines, etc. It passes communications data to and from the Data Modems
{via the CPU board) using the
TELCO
IN,
TELCO
OUT, SUB IN, and SUB
OUT
lines.
Communications with the PC
is
via the 9-pin RS-232 EIA connector. In addition, other signals
such
as
*BZDRV
and
"INTBZ
are supplied to the rear panel allowing the
user
to enable
th
e
internal alarm buzzer.
The
Communications 1/0 board
is
mounted
on
the outside of
the
rear
panel of the chassis.
MRC1620
7A0325
Rev
A
1-6

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7A0325 RevA
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1-7
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