LAUREL LTS6 Series User manual

Model LTS6
RS232 OR RS485 SERIAL INPUT,
ANALOG OUTPUT TRANSMITTER
Modbus or Custo ASCII Protocol
OWNERS MANUAL
LAUREL Electronics Inc.
3183-G Airway Ave, Costa Mesa, CA, 92626, USA
el: [phone] Fax: [phone] • Website: www.laurels.com

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1. ORDERING GUIDE, SERIAL INPUT TRANSMITTER
Configure a model number in this format: LTS60, CBL04
LTS
6
…Transmitter with 4-20 mA, 0-20 mA,
0-10V or -10V to +10V isolated analog
out ut, RS232 or RS485 serial data
in ut, and dual 120 mA solid state
relays. Default jum ered for RS232.
LTSE6E… Transmitter with 4-20 mA, 0-20
mA, 0-10V or -10V to +10V isolated
analog out ut, Ethernet serial data
in ut, and dual 120 mA solid state
relays.
Power
0............................. 85-264 Vac or 90-300 Vdc
1................................. 12-30 Vac or 10-
48 Vdc
ACCESSORIES
CBL04……RS232 cable, two 3- in connec-
tors on transmitter end, DB9
connector on com uter end.
CBL02……USB to DB9 ada ter cable. Can
be used with CBL01 or CBL04.
2. TABLE OF CONTENTS
1. ORDERING GUIDE, SERIAL INPUT TRANSMITTER .......................................................... 2
2. TABLE OF CONTENTS ....................................................................................................... 2
3. INTRODUCTION, SERIAL INPUT TRANSMITTER .............................................................. 3
4. RECEIVING & UNPACKING YOUR TRANSMITTER ........................................................... 3
5. SAFETY CONSIDERATIONS .............................................................................................. 4
6. TRANSMITTER FIELD WIRING ......................................................................................... 5
7. PROGRAMMING YOUR TRANSMITTER ............................................................................ 6
8. CHANGING JUMPER SETTINGS ....................................................................................... 13
9. DUAL RELAY OPERATION ............................................................................................... 15
10. MODBUS PROTOCOL TRANSMITTER COMMUNICATIONS .............................................. 17
11. CUSTOM ASCII PROTOCOL TRANSMITTER COMMUNICATIONS .................................... 20
12. SPECIFICATIONS, SERIAL INPUT TRANSMITTER ............................................................ 23
13. WARRANTY ...................................................................................................................... 24

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3. INTRODUCTION, RS232 OR RS485 SERIAL INPUT TRANSMITTER
The LTS6 seri l input to n log output tr nsmitter (or serial-to-analog converter) acce ts
RS232 or RS485 serial data using the Modbus or Custom ASCII rotocol, and converts it to an
isolated, scalable 4-20 mA, 0-20 mA, 0-10V or -10V to +10V analog out ut. The unit fits on a
35 mm DIN rail and is only 22.5 mm (0.89") thick. It is normally owered by AC (85-264 Vac),
but can o tionally be owered by low voltage AC or DC. All electrical connections are via
detachable screw-clam lugs. A se arate manual covers the LTSE6 serial in ut to analog
out ut transmitter, which acce ts Ethernet data and converts to an isolated, scalable 4-20 mA,
0-20 mA, 0-10V or -10V to +10V analog out ut.
The current or volt ge tr nsmitter output is jum er selectable and is transformer isolated to
avoid ground loo s. Either out ut rovides 16-bit resolution of the out ut s an and is ultra-
linear to within one bit. The out ut is scaled to the serial in ut in software. Out ut accuracy is
±0.02% of s an.
Du l solid st te rel ys rated 120 mA at 140 Vac or 180 Vdc are standard. The relays can
res ond to the transmitted serial values or to transmitted control characters, which override the
internal set oints. The relays can also be controlled inde endently of the serial in ut by
a lying signals to control in uts 1 and 2.
Isol tion to 250V rms is rovided for ower, the serial data in ut, analog out ut, and relay
out uts. Isolation adds safety and avoids ossible ground loo s.
Def ult seri l settings re for RS232 nd full-duplex RS485. Half-du lex RS485 can be
selected via jum ers or external wiring.
Tr nsmitter setup is via the unit’s serial ort using an external PC and Instrument Setu
software. This software can be downloaded from our website at no charge. The required 3-wire
transmitter-to-PC interface RS232 cable is easy to build and is also available for urchase.
4. RECEIVING & UNPACKING YOUR TRANSMITTER
Your transmitter was carefully tested and ins ected rior to shi ment. Should the transmitter be
damaged in shi ment, notify the freight carrier immediately. In the event the transmitter is not
configured as ordered or is ino erable, return it to the lace of urchase for re air or re lacement.
Please include a detailed descri tion of the roblem.

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5. SAFETY CONSIDERATIONS
W rning: Use of this transmitter in a manner other than s ecified may im air the rotection
of the device and subject the user to a hazard. Visually ins ect the unit for signs of damage. If the
unit is damaged, do not attem t to o erate.
C ution:
• This unit may be owered with AC (mains) from 85-264 Vac or 90-300 Vdc with the high
voltage ower su ly o tion, or 12-30 Vac or 10-48 Vdc with the low voltage ower su ly
o tion. Verify that the ro er ower o tion is installed for the ower to be used. This
transmitter has no AC (mains) switch. It will be in o eration as soon as ower is a lied.
• The 85-264 Vac or 90-300 Vdc mains connector (P1 Pins 1-3) is colored green to differentiate
it from other in ut and out ut connectors. The 12-30 Vac or 10-48 Vdc mains connector is
colored bl ck.
• To avoid dangers of electrocution and/or short circuit, do not attem t to o en the case while
the unit is under ower. However, signal wiring changes external to the case can be made
safely while the unit is under ower.
• To revent electrical or fire hazard, do not ex ose the transmitter to excessive moisture.
• Do not o erate the transmitter in the resence of flammable gases or fumes. Such an environ-
ment constitutes an ex losion hazard.
• Secure the transmitter to a 35 mm DIN rail.
Symbols used:
Caution (refer to accom anying
documents)
Caution, risk of electric shock.
Equi ment rotected throughout
by double insulation or reinforced
insulation.
Earth (ground) terminal.
Both direct and alternating current.
Oper ting environment:
• Class II (double insulated) equi ment
designed for use in Pollution degree 2.
PROVISION FOR COOLING
AL 1
AL 2
RESET
POWER
AL 1
AL 2
RESET
POWER
AL 1
AL 2
RESET
POWER
AL 1
AL 2
RESET
POWER
AL 1
AL 2
RESET
POWER
To avoid overheating, mount transmitters

with ventilation holes at to and bottom.
Leave a minimum of 6 mm (1/4”

) between
transmitters, or force air with a fan.

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6. TRANSMITTER FIELD WIRING

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7. PROGRAMMING YOUR TRANSMITTER
OVERVIEW
Serial in ut transmitters are rogrammed using a PC with an RS232 ort and Instrument Setu
(IS) software, which rovides a gra hical user interface. The software allows u loading, editing,
downloading and saving of setu data.
CONNECTING TO YOUR PC
Use a 3-wire RS232 cable (P/N CBL04) to connect your transmitter to the COM ort of your PC.
Download the file ISx_x_x.exe from our website and double-click on the file name. Click on
“Install Instrument Setu Software” and follow the rom ts. To launch IS software, ress on
Start => Programs => IS2 => Instrument Setu or on the deskto icon that you may have
created. Following a brief s lash screen, the Communications Setu screen will a ear.
ESTABLISHING COMMUNICATIONS
In the Communications Setu screen, select Custom ASCII as the Protocol, as this is the
factory default setting. Select Transmitter LT as the Device Ty e. Then click on the RS-232
(USB) button. In the resulting Establish Communications screen, select your Com Port and

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9600 as the Baud Rate. You will be able to change your rotocol and baud rate later under the
Communication setu tab. Click on Establish, and the two fields at the bottom of the screen
should turn green and dis lay your communication arameters and the counter-transmitter
revision level. Click on Main Menu. The com uter will remember your communication settings
for the next time that you run IS software.
The best way to learn IS software is to ex eriment with it. From the Main Menu, click on
Counter => Get Setu to retrieve (or get) the existing setu data from your counter-transmitter.
Click on View => Setu to bring u screens which allow you to easily edit the setu file using
ull-down menus and other selection tools. You can download (or ut) your edited file into the
transmitter by clicking on Counter => Put Setu . You can save your setu file to disk by clicking
on File => Save Setu and retrieve a reviously saved file from disk by click on File => O en.
After selecting a screen in ut field, ressing the F1 key will bring u detailed hel information
for that field.

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SETTING UP BASIC OPERATION
Under the In ut+Dis lay tab, select 000.00 Secs for Time Out. Ignore Signal In ut, Gate Time,
Filter, and Power-On Total, as these arameters do not a ly to the serial in ut transmitter.
Under Dis lay, select Remote A, Remote S or Remote C. These items corres ond to the
Remote A, Remote S and Remote C o erating modes, which are ex lained under the “Custom
ASCII Protocol Transmitter Communications” section of this manual.
The Control In uts ull-down menu controls the effect of grounding Control In ut 1, Control
In ut 2, or both. Selections a licable to the serial in ut transmitter are the following:
• Meter Reset, Function Reset, Meter Reset (first row). When this row is selected, grounding
Control In ut 2 (causes a function reset, which resets latched alarms.
• Activate Alarm 1, Activate Alarm 2, Activate Alarm 1&2. When this row is selected, ground-
ing Control In ut 1 activates relay 1, grounding Control In ut 2 activates relay 2, and
grounding both in uts activates Alarms 1 & 2.
• Tare Enable, Tare if Enabled, Tare (last row). When this row is selected, grounding Control
In ut 1 (normally with a ermanent connection) enables the Tare function. Momentarily
grounding Control In ut 2 stores the current digital value as an offset and subtracts this
offset from the digital reading sent to the transmitter, resulting in a zero value for alarms and
the analog out ut. This offset will also be subtracted from all new readings sent to the
transmitter. To change the offset, momentarily ground Control In ut 2 for the new in ut.

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SETTING UP RELAY ALARMS OPERATION
Under the Relay Alarms tab, enter the Set oint 1 and 2 values as well as other arameters
a licable to relay o eration. Set Alarm Source to Item 3 as illustrated. Please see the “Dual
Relay O eration” section of this manual for an ex lanation of the relay o erating modes.

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SETTING UP COMMUNICATIONS (REMOTE A & S MODES)
The above screen will a ear under the Communication tab if Remote A or Remote S has been
selected as Dis lay Ty e under the In ut+Dis lay tab. These two modes are not able to extract
data from an ASCII string that contains multi le data values and non-numeric characters.
Under this tab, you can reselect your Baud Rate, Device Address, Serial Protocol, and Full/Half
Du lex, even though you may have selected different values to establish initial communications
with your PC.
Set Out ut Mode to Command. Ignore the setting for CR(LF), Out ut Items, Out ut Filter, and
Out ut Rate, as these items a ly to digital transmission by a counter-transmitter, not to
digital-to-analog conversion by the serial in ut transmitter.

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SETTING UP COMMUNICATIONS (REMOTE C MODE)
The above screen will a ear under the
Communication tab if Remote C has
been selected as Dis lay Ty e under the
In ut+Dis lay tab. This mode is able to
extract data from an ASCII string that
contains multi le data values and non-
numeric characters. Please see the F1
Hel screen to the right.
Under this tab, you can reselect Baud
Rate, Device Address, Serial Protocol,
and Full/Half Du lex, even though you
may have selected different values to es-
tablish initial communications with your PC.
Set Out ut Mode to Command. Ignore CR(LF), Out ut Items, Out ut Filter and Out ut Rate, as
these items a ly to digital transmission by a counter-transmitter, not to digital-to-analog
conversion by the serial in ut transmitter.

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SETTING UP THE ANALOG OUTPUT
Under the Analog Out tab, set Source to Item 3. Under Range, select 0-20 mA, 4-20 mA, 0-10V
or -10V to +10V as your desired analog out ut. Ty e in your Lo Range Reading and Hi Range
Reading. These will create the two end oint values of your analog out ut range. Only enter the
numerical values. The decimal oint is ignored.
PUTTING YOUR PROGRAMMED SETUP INTO THE LTS6
After you have com leted all of your settings in Instrument Setu Software, click on the Main
Menu button. From the Main Menu, click on the Counter tab and do a Put Setu . This will
download your setu from the PC into the LTS6. Then exit Instrument Setu Software
com letely and disconnect your LTS6.
Failure to exit Instrument Setu software com letely will take the LTS6 out of the Remote C
mode back into the Remote A mode, which allows two-way serial communications between the
PC and LTS6.
Reconnecting the LTS6 to a PC and using Instrument Setu Software, for exam le to check on
reviously rogrammed settings, will also take the LTS6 out of the Remote C mode back into
the Remote A mode. In that case you will need to reset the LTS6 to Remote C and do a Put
Setu to download your setu from the PC into the LTS6.

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8. CHANGING JUMPER SETTINGS
Seri l Sign l
Duplex
Jumpers
Termin tion Resistor*
RS485 Full None E6 a = Transmit
E6 c = Receive
Half E6 b + d** E6 c
RS232 Full None None
* The termination resistor jum er settings should only be selected if the transmitter is the last
device on an RS485 line longer than 200 feet (60 m).
** Or connect external BTX to BRX and ATX to ARX (same effect as internal jum ers).
To reset communic tions to 9600 baud, command mode, Custom ASCII rotocol, and Address 1,
lace a jum er at E1 and ower u the transmitter.
An log Output
J4 Pins
Jumpers
Current, 4-20 mA 1 Lo, 2 Hi E2 a + d
Voltage, 0-10V 1 Lo, 2 Hi E2 b + c
Voltage, -10V to +10V 3 Lo, 2 Hi E2 b + c
Jumper settings re for CTR m in bo rd Rev F
Excit tion Output*
Jumpers
5V, 100 mA E3 a + c; E4 a
10V, 120 mA E3 a + c; E4 b
24V, 50 mA E3 b, E4 none
* Attem ting to draw more than the rated excitation out ut current will shut down the out ut.

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WHEN TO CHANGE JUMPERS
Your transmitter case does not need to be o ened if jum ers have already been set by your
distributor. Otherwise you will need to o en the case and either set jum ers or verify that the
factory default jum ers ositions will meet your needs.
The selection serial signal (RS232 or RS485) can be achieved by jum ers on the main board or
by external wiring, as documented on the revious age. The factory default setting for the
serial signal level is RS232.
HOW TO OPEN & CLOSE THE CASE
The two clamshell halves of the case are held together with a bolt and a nut at each of the four
corners. Use a Philli s screwdriver to remove the four bolts. The nut will then dro off, and the
clamshell halves will se arate. When closing the case, make sure that the ventilation grills are
ro erly aligned.
C ution: The nuts at each corner are not ca tive and are black. Take recautions so
that the nuts do not get lost.

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9. DUAL RELAY OPERATION
The o tional dual solid state relays can o erate in a basic alarm mode, in a hysteresis band mode,
or in a deviation band mode, as ex lained below. Set oint o eration is referenced to the digital
reading that is received as serial data. For exam le, tem erature alarm or control would be
referenced to a set oint in °C or °F.
ime
1000
Digital Reading
Setpoint
OFF OFF
ON
ime
1000 Setpoint OFF
ONON
Digital Reading
Active High Basic Alarm Active Low Basic Alarm
A b sic l rm changes state automatically when the reading rises above a s ecified limit, and
changes back automatically when the reading falls below that limit. A red LED indicates the
relay is in an alarm condition, which can be active high or active low, as rogrammed.
ime
Reading
1050
950 Pass
Fail
Fail
ime
1050
Setpoint = 1000
Hysteresis value = 50
Heater
OFF
Reading
ON ON ON
OFF OFF
950
Setpoint = 1000
Deviation value = 50
1000 1000 Pass
Hysteresis Band Alarm Deviation Band Alarm
A hysteresis b nd l rm controls relay action symmetrically around a set oint. The relay
closes (or o ens) when the reading goes above the set oint lus one hysteresis value, and
o ens (or closes) when the reading falls below the set oint less one hysteresis value. A narrow
hysteresis can be used to minimize relay chatter. A wide hysteresis band can be used for on-off
control a lications.

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A devi tion b nd l rm controls relay action symmetrically around a set oint. The relay
actuates when the reading falls within the deviation band, and de-actuates when the reading
falls outside. A deviation value (such as 50 counts) is set u around both sides of the set oint
to create the deviation band. Passbands around a set oint are often used for com onent
testing.
Control Input 1 causes a master reset when tied to ground if selected to do so with the Control
Inputs dro -down box under the Relay Alarms tab. This resets latched alarms and the analog
out ut. Control In ut 2 is not used with the serial in ut transmitter.

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10. MODBUS PROTOCOL TRANSMITTER COMMUNICATIONS
1. GENERAL
The Modbus ca ability conforms to the Modbus over Serial Line S ecification & Im lemen-
tation guide, V1.0. Both the Modbus RTU and Modbus ASCII rotocols are im lemented:
Modbus RTU
Baud Rate ........... 300, 600, 1200, 2400, 4800, 9600 or 19200
Data Format ....... 1 start bit, 8 data bits, 1 arity bit, 1 sto bit (11 bits total)
Parity .................. None, Odd, Even (if None, then 2 Sto bits for 11 total)
Address .............. 0 for broadcast, 1-247 for individual devices
Modbus ASCII
Baud Rate ........... 300, 600, 1200, 2400, 4800, 9600 or 19200
Data Format ....... 1 Start bit, 7 Data bits, 1 Parity bit, 1 Sto bit (10 bits total)
Parity .................. None, Odd, Even (if None, then 2 Sto bits for 10 total)
Address .............. 0 for broadcast, 1-247 for individual devices
2. FRAMING
Modbus RTU: Message frames are se arated by a silent interval of at least 3.5 character times.
If a silent interval of more than 1.5 character times occurs between two characters of the
message frame, the message frame is considered incom lete and is discarded. Frame Check =
16 bit CRC of the com lete message excluding CRC characters.
Modbus ASCII: The message begins immediately following a colon (:) and ends just before a
Carriage Return/ Line Feed (CRLF). All message characters are hexadecimal 0-9, A-F (ASCII
coded). The system allowable time interval between characters may be set to 1, 3, 5 or 10
seconds. Frame Check = 1 byte (2 hexadecimal characters) LRC of the message excluding the
initial colon (:) and trailing LRC and CRLF characters.
3. ELECTRICAL INTERFACE
Two-wire ( lus common) half-du lex RS485 or RS232 signal levels are jum er selectable on
the transmitter main board. The RS485 selection rovides a jum er selection for insertion of a
line termination resistor. Please see Section 14. In case of a long line (greater then 500 ft) to
the first device, a termination resistor should be selected for the first device. In case of a long
line between the first and last devices, a termination resistor should be selected for the first and
last devices. Never add termination resistors to more than two devices on the same line.

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4. COMMUNICATIONS SETUP
Parameters selectable via Instrument Setu software, distributed on CD ROM:
Serial Protocol ............................... Custom ASCII, Modbus RTU, Modbus ASCII
Modbus ASCII Ga Timeout ........... 1 sec, 3 sec, 5 sec, 10 sec
Baud Rate ....................................... 300, 600, 1200, 2400, 4800, 9600, 19200
Parity ............................................. No arity, odd arity, even arity
Device Address ............................. 0 to 247
5. SUPPORTED FUNCTION CODES
FC10: Write Multiple Registers (FC10 = 16 dec)
Writes internal registers containing in ut data for analog out ut and relays.
Register Addr
ess
D t Type Destin tion
Dec
Hex
107 006B Hi Word Hex Value Hi Word A lied to Item3
108 006C Lo Word Hex Value Lo Word A lied to Item3
FC05: Write Single Coil
Action command to transmitter
Output Address
Output V lue
Action Comm nd
00 01 FF 00 Transmitter Reset (No Res onse)
00 03 FF 00 Latched Alarm Reset
6. MESSAGE FORMATTING
MA = Device Address DD = Data (Hex) CL = CRC Lo Byte
FC = Function Code WW = Data (On/Off) CH = CRC Hi Byte
RA = Register Address SF = Sub-Function CR = Carriage Return
NR = Number of Registers EC = Error Code LF = Line Feed
NB = Number of bytes LRC = ASCII Checksum
Modbus RTU Form t
FC Action > 3.5
Ch r
Byte Number
1
2
3
4
5
6
7
8
9
10
11
05
05
Request
Res onse
NoTx
NoTx
MA
MA
FC
FC
RA
RA
RA
RA
WW
WW
WW
WW
CL
CL
CH
CH
10
10
Request
Res onse
NoTx
NoTx
MA
MA
FC
FC
RA
RA
RA
RA
NR
NR
NR
NR
NB
CL
DD*
CH
DD* CL CH

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Modbus ASCII Form t
FC Action
Byte Number
1
2
3
4
5
6
7
8
9
10
11
12
13
05
05
Request
Res onse
:
:
MA
MA
FC
FC
RA
RA
RA
RA
WW
WW
WW
WW
LRC
LRC
CR
CR
LF
LF
10
10
Request
Res onse
:
:
MA
MA
FC
FC
RA
RA
RA
RA
NR
NR
NR
NR
NB
LRC
DD*
CR
DD*
LF
LRC CR LF

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11. CUSTOM ASCII PROTOCOL TRANSMITTER COMMUNICATIONS
All setu arameters are entered into the transmitter via Instrument Setu (IS) software,
including the serial communication format, digital address, o erating mode, analog out ut
scaling, and relay o erating modes and set oints.
1. SERIAL COMMUNICATION FORMAT
The Custom ASCII serial communication format for both RS232 and RS485 is the following:
Modes ............... Full Du lex (se arate transmit and receive lines) or Half Du lex (RS485 only).
Baud Rate ......... 300, 600, 1200, 2400, 4800, 9600, 19200 selectable with IS software.
Data Format ...... 8 data bits, no arity, 1 sto bit
2. DATA FORMAT
The basic in ut data format consists of 9 or 10 ASCII characters, such as +9999.99A<CR>. The
first character is always a lus or minus sign. There are 6 numeric digits. A decimal oint is
always required, even when it follows the last digit. The letter A is an o tional alarm character.
<CR> is the carriage return character. A line feed <LF> character at the end of the string is
ignored.
3. NETWORK CONFIGURATIONS
Using the Custom ASCII rotocol, serial in ut transmitters can o erate in a oint-to- oint mode
using RS232 or RS485, or in a multi- oint mode using RS485:
The point-to-point mode is a direct connection between a com uter (or other digital device)
and the transmitter. It is suggested that address 1 be selected for the oint-to- oint mode.
The multi-point mode is a connection from a host com uter to multi le transmitters bused
together with their in uts and out uts connected in arallel. It is necessary to set u each
device on the bus with a different address from 1 to 31. To command a articular device, its
address is used in conjunction with the command, and only that device will res ond. The
out uts of all devices on the bus are set to a high im edance state, exce t the device being
addressed. Zero (0) is a s ecial address to which a device res onds only internally (e.g. Reset),
but it does not transmit any res onse on the out ut lines. All devices may be commanded
simultaneously with a 0 address, and there will not be any out ut res onse contention.
4. OPERATING MODES
The serial in ut transmitter has three serial in ut modes, which are dedicated to the analog
out ut and relays based on serial data received via RS232 or RS485:
Remote A ........ Addressable remote units (u to 31 units)
Remote S ........ Single remote unit
Remote C ........ Single remote unit rogrammed to select s ecific data from a data string.