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.