Omega Engineering LDP-124 Series User manual

LDP-124,LDP-126,LDP-144ANDLDP-146
SERIESFORSERIALASCIIINPUT
http://www.omega.com
e-mail:info @ omega.com
User's Guide

OMEGAnetOn-Line Service Internet e-mail
http://www.omega.com [email protected]
Servicing North America:
USA: OneOmegadrive,Box4047
ISO9001Certified Stamford,CT06907-0047
Tel:[phone] Fax:[phone]
e-mail:[email protected]
Canada: 976Bergar
Laval(Quebec)H7L5A1
Tel:[phone] Fax:[phone]
e-mail:[email protected]
For immediate technical or application assistance:
USAandCanada: SalesService:1-800-826-6342/1-800-TC-OMEGASM
CustomerService:1-800-622-2378/1-800-622-BESTSM
EngineeringService:1-800-872-9436/1-800-USA-WHENSM
Telex : 996404 EASYLINK : 62968934 CABLE : OMEGA
Mexicoand
LatinAmerica: Tel:[phone] Fax:[phone]
EnEspañol:[phone] e-mail:[email protected]
Servicing Europe:
Benelux: Postbus8034,1180LAAmstelveen,TheNetherlands
Tel:[phone] Fax:[phone]
TollFreeinBenelux:08000993344
e-mail:[email protected]
CzechRepublic: ul.Rudearmady1868,73301Karvina-Hranice
Tel:[phone] Fax:[phone]
TollFree:0800-1-66342 e-mail:[email protected]
France: 9,rueDenisPappin,78190Trappes
Tel:[phone] Fax:[phone]
TollFreeinFrance:0800-4-06342
e-mail:[email protected]
Germany/Austria: Daimlerstrasse26,D-75392Deckenpfronn,Germany
tel:[phone] Fax:[phone]
TollFreeinGermany:0130112166
e-mail:[email protected]
UnitedKingdom: OneOmegaDrive,RiverBendThecnologyCentre
ISO 9002 Certified Northbank,Irlam,Manchester
M445EX,England
Tel :[phone] Fax :[phone]
TollFreeintheUnitedKingdom:0800-488-488
e-mail:[email protected]
Itis the policyof OMEGA tocomply with allworldwide safety andEMC/EMI regulations thatapply. OMEGA is
constantlypursuingcertificationofitsproductstotheEuropeanNewApproachDirectives.OMEGAwilladdthe
CEmarktoeveryappropriatedeviceuponcertification.
Theinformationcontainedinthisdocumentisbelievedtobecorrect,butOMEGAEngineering,Inc.acceptsnoliabilityforanyerrorsitcontains,
andreservestherighttoalterspecificationswithoutnotice.
WARNING:Theseproductsarenotdesignedforusein,andshouldnotbeuserfor,patientconnectedapplications.
Page : 1

Page : 2
CONTENTS
DESCRIPTION SECTION PAGE
===========================================================================
IMPORTANT SAFETY CONSIDERATIONS 13
UNPACKING AND INSPECTION 24
MAIN FEATURES 35
INSTRUMENTS DESCRIPTION 46
FRONT DESCRIPTION, MODELS LDP-124-S & LDP-144-S 4.1 6
FRONT DESCRIPTION, MODELS LDP-126-S & LDP-146-S 4.2 6
REAR DESCRIPTION 4.3 6
GENERAL SPECIFICATIONS 56
WIRING 68
POWER SUPPLY, RECOMMENDED WIRING 6.1 8
PROTECTION FUSES 6.2 8
SIGNAL INPUT CONNECTION 6.3 8
OPERATING DESCRIPTION 79
POWER-UP 7.1 9
OPERATING MODES 7.2 9
INSTRUMENT ADDRESSING 7.3 10
OVERLOAD AND POLARITY INDICATORS 7.4 10
BS-4505 SUBSET 7.5 10
RECOGNISED CODES 7.6 11
TABLE OF CHARACTERS 7.7 12
CONFIGURATION 813
POWER SELECTION 8.1 13
INSTRUMENT CONFIGURATION 8.2 13
CONFIGURATION TABLES FOR BRIGHTNESS, BAUD RATE, OPERATING MODE
ADDRESS AND SUB-SET BS4505 8.3 14
CONFIGURATION TABLES FOR BITS, PARITY AND SIGNAL INPUT 8.4 15
LEVEL LOGIC CONFIGURATION 8.5 15
CONFIGURATION PROCEDURE 916
EXAMPLE APPLICATIONS (For signal type RS-232) 10 16
SHIFT OPERATING MODE, PROGRAMME EXAMPLE 10.1 17
STROBE OPERATING MODE, PROGRAMME EXAMPLE 10.2 18
SHIFT OPERATING MODE USING XON/XOFF, PROGRAMME EXAMPLE 10.3 19
INSTALLATION 11 20
MECHANICAL DIMENSIONS 12 20
WARRANTY 21
OTHER PRODUCTS 22

Page : 3
INSTALLATION
PRECAUTIONS.- Theinstallationandthe
future use of this unit
must be done by suit-
able qualified person-
nel.TheunithasnotAC
(mains)switch,itwillbe
inoperationassoonas
power is connected.
The installation must
incorporateanexternalmainswitch.
The unit has a protection fuse incorporated on the AC socket, if it is
necessary to change or replace, use the time-lag fuse according to
IEC127/2andthevaluesindicatedbelow.
200 mA when the unit is operating at 230 Vac
400 mA when the unit is operating at 115 Vac.
Install also the necessary devices to protect the operator and the
process when using the unit to control a machine or process where
injurytopersonnelordamagetoequipmentorprocess,mayoccuras
a result of failure of the unit.
Seeparagraph6,WIRINGandparagraph8,CONFIGURATIONand
check that all jumpers AND switches are on the correct position.
SAFETY PRESCRIPTIONS.-
TheunithasbeendesignedandtestedunderEN-61010-1rulesand
isdeliveredingoodcondition.Thisopera-
tor's manual contains useful information
for
electricalconnections.Donotmakewiring
signal changes or connections when
power is applied to the unit. Make signal
connectionsbeforepowerisappliedand,if
reconnection is required, disconnect the
AC (mains) power before such wiring is
attempted.
Installtheunitin placeswithagoodventilationtoavoidtheexcessive
heating.Andfarfromelectricalnoisesourceormagneticfieldgenera-
torssuch aspower relays,electricalmotors, speedcontrols etc...
The unit cannot be installed in open places. Do not use until the
installationisfinished.
POWERSUPPLY.-
Thepowersupplymustbeconnectedtotheadequateterminals (see
theconnectioninstructions).Thecharacteristicsofthepowersupply
areshowedonthelabelontherearpart.Pleasemakesurethattheunit
is correctly connected to a power supply of the correct voltage and
frequency.
Donotuseotherpowersupplyotherwisepermanentdamagemaybe
causedto theunit.
Donotconnecttheunittopowersourcesheavilyloadedortocircuits
which power loads in cycle ON-OFF or to circuits which power
inductiveloads.
SIGNALWIRING.-
Certainconsiderationsmustbegivenwheninstallthesignalinputand
control wires. If the wires are longs can act like an antenna and
introducethe electricalnoise totheunit, therefore:
Do not install the signal input wires in the same conduit with power
lines, heaters, solenoids, SCR controls etc....and always far from
theseelements.
When shielded wires are used, connect the shield to the common
terminalandleaveunconnectedtheotherendoftheshieldanddonot
connecttothemachineground.
1.- IMPORTANT SAFETY CONSIDERATIONS
SAFETY CONSIDERATIONS
PRESCRIPTIONS.-
Before starting any operation of adjustment, replacement,
maintenanceorrepair,theunitmustbedisconnectedfromanykind
ofpowersupply.
Keeptheunitclean, toassure goodfunctioning and performance.
Use for it a clean and humid rag. Do not use for the frontal lens
abrasiveproducts,solvents,alcohol,etc...becauseitstransparence
couldbe damagedand thismaycause difficultyfor acorrectvision
ofthereading.
To prevent electrical or
fire hazard, do not ex-
pose the unit to exces-
sivemoisture.
Do not operate the unit
inthepresenceofflam-
mable gases or fumes,
suchasenvironment
constitutes a definite
safetyhazard.Theunitis designedtobe mountedina metalpanel.
Iftheunitshowssignsofdamage,orisnotabletoshowtheexpected
measures, or has been stored in a bad conditions or a protection
failurecanoccur,thendonotattempttooperateandkeeptheunitout
ofservice.
IN CASE OF FIRE
1.- Disconnect the unit from the power supply.
2.-Give thealarm accordingto thelocal rules.
3.-Switch off allthe airconditioning devices.
4.-Attackthe firewith carbonicsnow, donot usewater inany case.
WARNING : In closed areas do not use systems with
vaporizedliquids.
CONNECTIONS
All wiring connections are made using push-in cable connectors.
There is a separate connector block for power supply and input
signals.Pleasemakesurethateachconnectorblockisconnectedon
theadequateplace.
Thewirecrosssectionrecommendedforsignalinputsis1mm2and
for power supply 2.5 mm2.
PANEL MOUNTING
Verifythatthepanelcut-outiscorrectlyaccordingtothedimensions
indicated on page 20 with a minimum depth of 150 mm. (5.9").
Install the fixation pieces in the lateral guides of the unit by its rear
partandthenturnthescrew firmlyagainstthepanel,untiltheunitis
totallyholdon.
Seeparagraph11on page20.

Page : 4
Number of digits
4 = 4 digits
6 = 6 digits
Display color : R = Red
G = Green
Model reference : S
Basic serie
Digit size
2 = 57 mm (2.3")
4 = 100 mm (4")
If there are some doubts or inquiries about the present instrument, please contact OMEGA
ENGINEERING´S customer service department.
When the shipment arrives remove the Packing List and verify that you have received all equipment.
Then inspect the box and the instrument, and if there is evidence of damage caused by bad handling during
the transport, it is advisable to make a careful inspection of all damages making a note of all of them and to
pass on this information directly to the Transport Company.
If this occurs but with insured material, ask the Transport Company for instructions about submitting a claim
2.- UNPACKING AND INSPECTION
It is advisable to do a detailed reading of this Manual before mounting the instrument. This Operator's Manual
contains all the technical specifications : electricals as well as mechanics, both necessary to do a correct
installation and also a good use of the instrument.
At the same time the user will acquire the knowledge needed to obtain the best performances of the product.
Check that inside the present cardboard box, there are the following :
1 Instrument Model LDP-1XX-S.
1 Operator's Manual.
1 Connector for Power Supply.
1 Screw-clamp connectors, 4 pins female for signal inputs.
2 Pieces for fixing the unit against the panel.
REFERENCE KEY
All models have a label on the rear part with their references printed on the following format :
Power supply
0 = 230 Vac 50/60 Hz.
1 = 115 Vac 50/60 Hz.
LDP- 1XX- X- X-X

Page : 5
3.- MAIN FEATURES
The LDP-XX-S are a four or six digits plus polarity (only minus) character remote display module. They accept
serial ASCII coded data into a differential or single ended line receiver, at common baud rates.
Numeric data and a selection of other characters can be displayed. The character set includes decimal point,
overload/alarm and negative sign. Simple messages e.g. Hi Al, Lo Al, °C, °F can be formed with characters
presentable on seven segment displays.
Units connected on a common data line may be individually addressed. This is achieved by sending code 03
followed by 02 (or XOFF XON), an address from 0 to 31 (ASCII 30 to 4F) and the data. The address 0 (ASCII
30) is common to all remote displays for simultaneous display of the same message.
The unit may be switch programmed to operate in a "strobed" mode whereby the data string is transferred to
the display on reception of a carriage return. Alternatively a "shift" mode can be used in which the characters
are displayed according to their current position in the input shift register.
Serie LDP-124-S : 4 digits type LED, seven segments, red or green colour with 57 mm (2.3") height and
minus sign for polarity.
Serie LDP-144-S : 4 digits type LED, seven segments, red or green colour with 100 mm (4") height and
minus sign for polarity.
Serie LDP-126-S : 6 digits type LED, seven segments, red or green colour with 57 mm (2.3") height and
minus sign for polarity.
Serie LDP-146-S : 6 digits type LED, seven segments, red or green colour with 100 mm (4") height and
minus sign for polarity.
The common features for all series are the following:
MECHANICAL.-
Housed in a rugged extruded aluminium profile housing for panel mounting or free standing.
Finished in anodized black colour. The frontal lens is mounted with a special rubber profile which
provides the front part of the unit with an IP-65 protection.
The product has been designed to fulfil a need for use in process control environments and the
characters are easily readable at large distances.
CONNECTIONS.-
Connectionsfor Signal Inputsaremade usingonescrew-clamp connector offour terminals located
on the rear part of the unit.
The recommended wire cross section for signal input is 1 mm2.
Connection for Power Supply uses a push-in cable connector with 2 terminals for power and 1
terminal for earth.
The fuse is located in the Power Supply socket, as well as the spare fuse.

Page : 6
C D
B
A
CD
B
A
1
2
3
N/C Power Supply
Attaching screws
1
2
3
N/C
Signal Input
Connector.
5.- GENERAL SPECIFICATIONS
DISPLAY
Type . . . . . . . . . . . . . . . . . . . . 4 or 6 digits, 7 segments, red or green LED.
Height digit . . . . . . . . . . . . . . . 57 (2.3") or 100 mm. (4")
Range . . . . . . . . . . . . . . . . . . . -9999 to 9999 or -999999 to 999999
Polarity . . . . . . . . . . . . . . . . . . Minus only (-)
Decimal point . . . . . . . . . . . . . Programmable position.
INPUT SIGNALS Selectable by internal jumpers.
TTL level Input impedance . . . . >12 KΩ
Logic 1. . . . . . . . . . . . ≥ 2 V = stop bit
Logic 0. . . . . . . . . . . . ≤0.8 V = start bit
Maximum input . . . . . +12 to -7 V.
4.- INSTRUMENTS DESCRIPTION
4.1 FRONT DESCRIPTION, MODELS : LDP-124-S and LDP-144-S
A : Overrange indicator.
B : Minus sign.
C : Decimal points.
D : 4 digits, seven segments.
4.2 FRONT DESCRIPTION, SERIES : LDP-126-S and LDP-146-S
A : Overrange indicator.
B : Minus sign.
C : Decimal points.
D : 6 digits, seven segments.
4.3 REAR DESCRIPTION

Page : 7
2 mA Loop Logic 1. . . . . . . . . . . . ≥ 1.6 mA = start bit
Logic 0. . . . . . . . . . . . ≤0.2 mA = stop bit
Level . . . . . . . . . . . . . Internal jumper reversible
Voltage drop . . . . . . . 1 V max at 2 mA.
Max. loop current . . . 0.5 A.
20 mA Loop Logic 1. . . . . . . . . . . . ≥ 16 mA = start bit
Logic 0. . . . . . . . . . . . ≤2 mA = stop bit
Level . . . . . . . . . . . . . Internal jumper reversible
Voltage drop . . . . . . . 1 V max at 20 mA.
Max. loop current . . . 0.5 A.
Bipolar ±5 V Input impedance . . . . >12 KΩ
RS-423 Logic 1. . . . . . . . . . . . ≥ 0.5 V = start bit
Logic 0. . . . . . . . . . . . ≤0 V = stop bit
Open line. . . . . . . . . . Idle
Level . . . . . . . . . . . . . Internal jumper reversible
Maximum input . . . . . ±7 V.
Bipolar ±15V Input impedance . . . . >30 KΩ
RS-232 Logic 1. . . . . . . . . . . . ≥ 3 V = start bit
(Default Logic 0. . . . . . . . . . . . ≤-3 V = stop bit
Setting) Open line. . . . . . . . . . Idle
Level . . . . . . . . . . . . . Internal jumper reversible
Maximum input . . . . . ±15 V.
Differential Threshold . . . . . . . . . Less than ±0.2 V. Internal charge.
RS422/485 Hysteresis . . . . . . . . . 70 mV typical
Input impedance . . . . >12 KΩ
Max. diff. input . . . . . ±12 V.
Max. Volt. relative to
signal common . . . . . +12/-7 V.
Termination . . . . . . . . 121 Ω jumper selectable
Receiver loop . . . . . . . . . . . . . . . . . 2 mA or 20 mA ±20%
Source : Open circuit voltage . 5 V. ±5%
Compliance . . . . . . . . 3V at 2 or 20 mA.
HANDSHAKE . . . . . . . . . . . . . . . . . No handshake required, terminal accepts continuous data.
ENVIRONMENTAL
Operating temperature . . . . . . 0 to +50 ºC (32 to 122 ºF).
Storage temperature . . . . . . . . -20 to +85 º C (-4 to 185 ºF).
Relative humidity . . . . . . . . . . 0 to 85 % not condensed.
Protection . . . . . . . . . . . . . . . . IP65. (Front part only).
MECHANICAL
Case material . . . . . . . . . . . . . Aluminium extruded.
Finished . . . . . . . . . . . . . . . . . Anodized, black colour.
For dimensions, panel cut-out, depth and weight see table on page 20
ELECTRICAL
Standard power supply . . . . . . 115 Vac. ±10% 50 / 60 Hz. (230 Vac optional)
Consumption. . . . . . . . . . . . . . See table on page 20.

Page : 8
6.- WIRING
6.1.- POWER SUPPLY, RECOMMENDED WIRING
FUSE and spare fuse.
Power switch
POWER SUPPLY
115 Vac (230 Vac Optional).
6.2.- PROTECTION FUSES
6.3.- SIGNAL INPUT CONNECTION
The serial ASCII input circuit can be set to one of 10 arrangements. Unless otherwise specified at the time of
order, the input circuit will be factory default set for RS-232 levels. If you are in any doubt about the input condi-
tions, it is advisable to remove the rear panel of the unit and inspect the internal jumper switch positions.
The operating mode of the unit and baut rate are, unless otherwise specified at the time of order, set for the
default settings of :
MODE : strobed display BAUD : 1200 ADDRESS : 0 BITS : 8 PARITY : none
If you are in any doubt about these settings, they can be determined by powering up the unit with the input line
idle, and observing the display at power-up.
To change any set-up conditions see the configuration section
The unit has a protection fuse located on the power supply
socket.
If this fuse must be replaced or changed because the power
supplyis changed,use thetime-lag fuseaccording toIEC 127/
2 with the values indicated on the table.
1
2
3
N/C
Connections are : 4 way pin connection.
Pin 1 = Signal B
Pin 2 = Signal A
Pin 3 = Signal common
Pin 4 = Not used.
Note : Signal common should be grounded
to system common.
Signal Input SignalInputConnector
Type Pin 1 Pin 2 Pin 3
RS-232 ±15 V Input +5 V GND
RS-422/RS-485 SignalB SignalA GND
InternalLoad
RS-422/RS-485 SignalB SignalA GND
ExternalLoad
RS-423 ±5 V Input +5 V GND
2 mALoopPowered Loop- Loop+ not used (Loopinternallypowered)
Loop+ not used Loop- (Loopexternallypowered)
20mALoopPowered Loop- Loop+ notused (Loopinternallypowered)
Loop+ not used Loop- (Loopexternallypowered)
TTLLevel +5 V Input GND
Signal connections are different for different input configurations. They are as follows :
Power Fuse
Supply value
230 Vac 0.2 A
115 Vac 0.4 A

Page : 9
NOTE : 4 digit version does
not have 2 left hand
characters.
Baud RATE
Recognition ADDRESS
Input Signal LEVEL
Operating MODE
PARITY
Number of BITS
Polarity
indicator
Overload
indicator
7 6 5 4 3 2 1
Character 1, Baud RATE displayed will be a number from 0 to 7. Factory default is 3 (1200 baud).
Character 2, Recognition ADDRESS : The ADDRESS displayed will be 0 by default (30h) or one of 31 other
numeric and alphanumeric characters from 1 through to letter O. See Table of Characters.
Character 3, Input Signal LEVEL, will show a symbol "L" for a correct idle condition or a symbol "H" for an
incorrect idle condition. For RS485 signals, ensures the transmitter is in active driving condition, since a 485
driver in a receive condition may give a correct idle indication even if the signal wires are transposed.
Character 4, Operating MODE displayed will be "F"for shift mode, or "r"for strobe mode, which is the
factory default.
Character 5, PARITY will show the symbol "I", by default, which means "Ignored" or one of the following
characters ; "n" for none, "o" for Odd and "E" for Even.
Character 6, Number of BITS displayed will be 7 for seven bits or 8 for eight bits.
Character 7, will show the Polarity indication.
After 3 seconds of power-up the display will shown "- - - - - - -", (all middle bar and polarity indicator is light-up)
it means that the instrument is ready to receive data, and all printable characters received (20, 2B, 2D, 2E
and 30 to 5F) will be displayed directly if the instrument is programmed in shift mode or after receiving the
code 0D in strobe mode.
It is convenient in this moment and before starting the addressing mode, to send a character XOFF or ETX to
clear the internal buffer from uindesirable data. (XOFF recommended).
7.2.- OPERATING MODES
The following serial ASCII protocols are DIP switch selectable :
Mode 0 : Each printable character as it is received is placed in the least significant position and all characters are
shifted left one position. Following a carriage return character, the next valid character received causes
the display to clear and that character is placed in the least significant position. (If it is a printable
character)
Mode 1 : Printable characters are placedin abuffer onreception. Receipt of the carriagereturn charactercauses
the buffer contents to be transferred to the display.
7.- OPERATING DESCRIPTION
7.1.- POWER-UP
Having determined that the unit has been configured for the correct input signal, connect the mains plug to a
suitable AC power source and the signal input to the signal source.
Ensure that the source is an idle condition, i.e. not transmitting data, and switch on the mains power.
The unit will power-up displaying its recognition address, its baud rate, the condition at the signal input, its
operating mode, the parity and bits number.
The display will be as follows :