Red Lion LD2A05P0, LD4A05P0, LD2A, LD4A User guide

AIR PRESSURE STABILIZATION VENT

(57.15)

2.25

X

Z

Y

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US LISTED

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www.redlion.net

MODEL LD - LARGE DC VOLT/CURRENT/PROCESS DISPLAY

 2.25" & 4" HIGH RED LED DIGITS
 PROGRAMMABLE SCALING AND DECIMAL POINTS
 PROGRAMMABLE USER INPUT
 DUAL 5 AMP FORM C RELAY
 ALUMINUM NEMA 4X/IP65 CASE CONSTRUCTION
 RS232/RS485 SERIAL COMMUNICATIONS

U

R

C

L

US LISTED

IND. CONT. EQ.

51EB

U

R

C

L

US LISTED

LABORATORY EQUIPMENT

3RSD

 UNIVERSALLY POWERED

Bulletin No. LDA-C
Drawing No. LP0673
Released 09/09

GENERAL DESCRIPTION

The Large Display is a versatile display available as a DC volt, current, or
process meter with scaling, serial communications and dual relay outputs. The 5
digit displays are available in either 2.25" or 4" high red LED digits with
adjustable display intensities. The 2.25" high models are readable up to 130 feet.
The 4" high models are readable up to 180 feet. Both versions are constructed
of a NEMA 4X/IP65 enclosure in light weight aluminum.

All models also come with dual Form C relay outputs and RS232 / RS485
serial communications.

SAFETY SUMMARY

All safety regulations, local codes and instructions that appear in this and
corresponding literature, or on equipment, must be observed to ensure personal
safety and to prevent damage to either the instrument or equipment connected to
it. If equipment is used in a manner not specified by the manufacturer, the
protection provided by the equipment may be impaired.

CAUTION: Risk of Danger.

Read complete instructions prior to

installation and operation of the unit.

CAUTION: Risk of electric shock.

The protective conductor terminal is bonded to conductive
parts of the equipment for safety purposes and must be
connected to an external protective earthing system.

ORDERING INFORMATION

MODEL NO. DESCRIPTION PART NUMBER

LD2A

LD4A

LD Plug

2.25" High 5 Digit Red LED Volt/Current Meter w/
Relay Output and RS232/RS485 Serial Comms

4" High 5 Digit Red LED Volt/Current Meter w/
Relay Output and RS232/RS485 Serial Comms

Panel Meter Plug for LD models
(NOT included in LD Product UL File)

LD2A05P0

LD4A05P0

LDPLUG00

SPECIFICATIONS

1. DISPLAY: 5 digit, 2.25" (57 mm) or 4" (101 mm) intensity adjustable Red LED

(-99999 to 99999)

2. POWER REQUIREMENTS:

AC POWER: 50 to 250 VAC 50/60 Hz, 26 VA
DC POWER: 21.6 to 250 VDC, 11 W
DC Out: +24 VDC @ 100 mA if input voltage is greater than 50 VAC/VDC

+24 VDC @ 50 mA if input voltage is less than 50 VDC

Isolation: 2300 Vrms for 1 min. to all inputs and outputs

3. INPUT RANGES: Jumper Selectable
D.C. Voltages: 200 mV, 2 V, 20 V, 200 V, 10 V

INPUT

RANGE

200 mV 0.1% of span

20 V 0.1% of span

200 V

10 V

ACCURACY @

23

C LESS

THAN 85% RH

2 V 0.1% of span

0.1% of span

0.1% of span

INPUT

IMPEDANCE

1.027 M

1.027 M

1.027 M

1.027 M
538 K

D.C. Currents: 200 A, 2 mA, 20 mA, 200 mA

INPUT

RANGE

200 μΑ 0.1% of span

2 mA 0.1% of span

20 mA 0.1% of span

200 mA 0.1% of span

ACCURACY @

23

C LESS

THAN 85% RH

INPUT

IMPEDANCE

1.111 K
111 
11 
1 

D.C. Process: 4 to 20 mA, 1 to 5 VDC, 0/1 to 10 VDC

INPUT RANGE SELECT RANGE

4 - 20 mA Use the 20 mA range

1 - 5 VDC Use the 10V range

1 - 10 VDC Use the 10V range

4. OVERRANGE/UNDERRANGE INDICATION:
Input Overrange Indication: “

OLOL”.

Input Underrange Indication: “ULUL”.

Display Overrange/Underrange Indication: “.....”/“-.....”

MAX

INPUT

RESOLUTION

SIGNAL

75 VDC 10 μV 70 ppm /°C

75 VDC 0.1 mV 70 ppm /°C

250 VDC 1 mV 70 ppm /°C

250 VDC

30 V

MAX

INPUT

SIGNAL

15 mA 10 nA 70 ppm /°C

50 mA 0.1 μA 70 ppm /°C

150 mA 1 μA 70 ppm /°C

500 mA 10 μA 70 ppm /°C

10 mV

1 mV

RESOLUTION

TEMP.

COEFFICIENT

70 ppm /°C

70 ppm /°C

TEMP.

COEFFICIENT

DIMENSIONS In inches (mm)

1

PART

NUMBER

Y (Height)X (Length)

4 (101.6)16 (406.4)LD2A05P0

7.875 (200)26 (660.4)LD4A05P0

Z (Center)

12 (304.3)

22 (558.8)

5. A/D CONVERTER: 16 bit resolution

MOUNTING HOLE (.281")

MUST BE
CONNECTED TO

TERMINAL #3 (TBA)

A/D Conversion Rate: 6 readings/sec.

6. DISPLAY RESPONSE TIME: 500 msec min.

7. USER INPUT:

Software selectable pull-up (8.6 K) or pull-down resistor

(3.9 K) that determines active high or active low input logic.
Trigger levels: V
Response Time: 5 msec typ.; 50 msec debounce (activation and release)

= 1.0 V max; VIH = 2.4 V min; V

IL

MAX

= 28 VDC

8. COMMUNICATIONS:

Type: RS485 or RS232
Isolation To Sensor & User Input Commons: 500 Vrms for 1 min.

Working Voltage: 50 V. Not Isolated from all other commons.

Data: 7/8 bits
Parity: no, odd or even
Baud Rate: 300 to 38.4 K
Bus Address: Selectable 0 to 99, Max. 32 meters per line (RS485)

9. MEMORY: Nonvolatile E

2

PROM retains all programming parameters and

max/min values when power is removed.

10. OUTPUT:

Type: Single FORM-C relay
Isolation To Sensor & User Input Commons: 1400 Vrms for 1 min.

Working Voltage: 150 Vrms
Contact Rating: 5 amps @ 120/240 VAC or 28 VDC (resistive load), 1/8

H.P. @ 120 VAC (inductive load)

Life Expectancy: 100,000 minimum operations
Response Time:

Turn On Time: 4 msec max.

Turn Off Time: 4 msec max.

11. ENVIRONMENTAL CONDITIONS:

Operating temperature: 0 to 50 °C
Storage temperature: -40 to 70 °C
Operating and storage humidity: 0 to 85% max. RH (non-condensing)
Vibration According to IEC 68-2-6: Operational 5 to 150 Hz, in X, Y, Z

direction for 1.5 hours, 2 g’s (1 g relay).
Shock According to IEC 68-2-27: Operational 30 g’s (10 g relay), 11 msec

in 3 directions.
Altitude: Up to 2,000 meters

12. CONNECTIONS:Internal removable terminal blocks

Wire Strip Length: 0.4" (10 mm)
Wire Gage: 24-12 AWG copper wire
Torque: 5.3 inch-lbs (0.6 N-m) max.
Cable Diameter: Outside diameter must be 0.181" (4.6 mm) to 0.312" (7.9

mm) to maintain NEMA 4 rating of cord grips.

13. CONSTRUCTION: Aluminum enclosure, and steel side panels with textured

black polyurethane paint for scratch and corrosion resistance protection. Meets
NEMA 4X/IP65 specifications. Installation Category II, Pollution Degree 2.

14. CERTIFICA TIONS AND COMPLIANCES:

SAFETY

UL Listed, File # E137808, UL508, CSA C22.2 No. 14-M95

File # E179259, UL61010A-1, CSA C22.2 No. 61010-1

LISTED by Und. Lab. Inc. to U.S. and Canadian safety standards
Type 4X Enclosure rating, UL50
IECEE CB Scheme Test Report #E179259-A3-CB-1

Issued by Underwriters Laboratories, Inc.

IEC 61010-1, EN 61010-1: Safety requirements for electrical equipment

for measurement, control, and laboratory use, Part 1.

IP65 Enclosure rating, IEC 529

ELECTROMAGNETIC COMPATIBILITY

Emissions and Immunity to EN 61326: Electrical Equipment for Measurement,

Control and Laboratory use.

Notes:

Immunity to Industrial Locations:

Criterion BEN 61000-4-2Electrostatic discharge
4 kV contact discharge
8 kV air discharge
Criterion BEN 61000-4-3Electromagnetic RF fields
10 V/m
Criterion BEN 61000-4-4Fast transients (burst)
2 kV power
1 kV signal
Criterion AEN 61000-4-5Surge
1 kV L-L,
2 kV L&N-E power
Criterion BEN 61000-4-6RF conducted interference
3 V/rms

Voltage dip/interruptions

Criterion AEN 61000-4-11

0.5 cycle

Emissions:

Class AEN 55011Emissions

1. Criterion A: Normal operation within specified limits.

2. Criterion B: Temporary loss of performance from which the unit self-

recovers.

15. WEIGHT:

LD2A05XX - 4.5 lbs (2.04 kg)
LD4A05XX - 10.5 lbs (4.76 kg)

1.0 INSTALLING THE METER

INSTALLATION

The meter meets NEMA 4X/IP65 requirements when properly installed.

INSTALLATION ENVIRONMENT

The unit should be installed in a location that does not exceed the operating
temperature. Placing the unit near devices that generate excessive heat should
be avoided. The unit should only be cleaned with a soft cloth and neutral soap
product. Do NOT use solvents.

Continuous exposure to direct sunlight may accelerate the aging process of
the front overlay. Do not use tools of any kind (screwdrivers, pens, pencils, etc.)
to operate the keypad of the unit.

2.0 SETTING THE JUMPERS

INPUT RANGE JUMPER

This jumper is used to select the proper input range. The input range selected
in programming must match the jumper setting. Select a range that is high
enough to accommodate the maximum signal input to avoid overloads. To
access the jumper, remove the side cover of the meter.

Warning: Exposed line voltage exists on the circuit boards.

Remove all power to the meter and load circuits before accessing
inside of the meter.

MOUNTING INSTRUCTIONS

This display is designed to
be wall mounted or
suspended from a ceiling
truss or other suitable
structure capable of
supporting the LDA.
Caution should be
exercised when hanging
the display to provide for
the safety of personnel. If
hanging the LDA, run the
suspension cables (or chains)
through the mounting bracket
holes. For wall mounting use
#10-32 size bolts.

20 V/200 V

10 V

200 MV/2 V

2 MA

200 µA

20 MA

200 MA

RANGE SELECT

654231

TBC

2

3.0 WIRING THE METER

EMC INSTALLATION GUIDELINES

Although this meter is designed with a high degree of immunity to Electro­Magnetic Interference (EMI), proper installation and wiring methods must be
followed to ensure compatibility in each application. The type of the electrical
noise, source or coupling method into the meter may be different for various
installations. The meter becomes more immune to EMI with fewer I/O
connections. Cable length, routing, and shield termination are very important
and can mean the difference between a successful or troublesome installation.
Listed below are some EMC guidelines for successful installation in an
industrial environment.

1. The meter should be properly connected to protective earth.

2. Use shielded (screened) cables for all Signal and Control inputs. The shield

(screen) pigtail connection should be made as short as possible. The

connection point for the shield depends somewhat upon the application.

Listed below are the recommended methods of connecting the shield, in order

of their effectiveness.

a. Connect the shield only at the panel where the unit is mounted to earth

ground (protective earth).

b. Connect the shield to earth ground at both ends of the cable, usually when

the noise source frequency is above 1 MHz.

c. Connect the shield to common of the meter and leave the other end of the

shield unconnected and insulated from earth ground.

3. Never run Signal or Control cables in the same conduit or raceway with AC

power lines, conductors feeding motors, solenoids, SCR controls, and

heaters, etc. The cables should be ran in metal conduit that is properly

grounded. This is especially useful in applications where cable runs are long

and portable two-way radios are used in close proximity or if the installation

is near a commercial radio transmitter.

4. Signal or Control cables within an enclosure should be routed as far as

possible from contactors, control relays, transformers, and other noisy

components.

5. In extremely high EMI environments, the use of external EMI suppression

devices, such as ferrite suppression cores, is effective. Install them on Signal

and Control cables as close to the unit as possible. Loop the cable through the

core several times or use multiple cores on each cable for additional protection.

Install line filters on the power input cable to the unit to suppress power line

interference. Install them near the power entry point of the enclosure. The

following EMI suppression devices (or equivalent) are recommended:

Ferrite Suppression Cores for signal and control cables:

Fair-Rite # 0443167251 (RLC# FCOR0000)
TDK # ZCAT3035-1330A
Steward # 28B2029-0A0

Line Filters for input power cables:

Schaffner # FN610-1/07 (RLC# LFIL0000)
Schaffner # FN670-1.8/07
Corcom # 1 VR3

Note: Reference manufacturer's instructions when installing a line filter.

6. Long cable runs are more susceptible to EMI pickup than short cable runs.

Therefore, keep cable runs as short as possible.

7. Switching of inductive loads produces high EMI. Use of snubbers across

inductive loads suppresses EMI.

Snubber: RLC# SNUB0000.

WIRING OVERVIEW

Electrical connections are made via pluggable terminal blocks located inside
the meter. All conductors should conform to the meter's voltage and current
ratings. All cabling should conform to appropriate standards of good installation,
local codes and regulations. It is recommended that the power supplied to the
meter (DC or AC) be protected by a fuse or circuit breaker. When wiring the
meter, compare the numbers on the label on the back of the meter case against
those shown in wiring drawings for proper wire position. Strip the wire, leaving
approximately 0.4" (10 mm) bare lead exposed (stranded wires should be tinned
with solder.) Insert the lead under the correct screw clamp terminal and tighten
until the wire is secure. (Pull wire to verify tightness.) Each terminal can accept
up to one #14 AWG (2.55 mm) wire, two #18 AWG (1.02 mm), or four #20
AWG (0.61 mm).

WIRING CONNECTIONS

Internal removable terminal
blocks are used for power and
signal wiring. Access to
terminal blocks is through
conduit fittings. Remove end
plates with ¼" nut driver. For
LD4 versions, all wiring is on
right side of unit. For LD2
versions, power and relay
wiring is on the right side and
the input, serial, DC out and
user input is on the left side.

Connect drain wire from
shielded cable(s) to screw on
side plate for proper grounding.

TBA

321

Front

TBB

465132

Front

LD2

RANGE SELECT

TBC

TBD

LD4

321

465321

654231

53421

TBA

TBB

RANGE SELECT

TBC

TBD

31 2 4 56

Front

1 2345

3.1 POWER WIRING

The power wiring is made via the 3 position terminal block (TBA) located

inside the unit (right side). The DC out power is located: LD2 - left side, LD4

- right side

Power

Terminal 1: VAC/DC +
Terminal 2: VAC/DC ­Terminal 3: Protective Conductor

Terminal

+

-

L1

1

2

L2

TBA

3

RIGHT SIDE VIEW LEFT SIDE VIEW

DC Out Power

Terminal 4: + 24 VDC OUT
Terminal 6: User Common

3

+ EXC

4

USER COMM

6

TBC

3.2 USER INPUT WIRING

The User Input is located: LD2 - left side, LD4 - right side

Sinking Logic Sourcing Logic

Terminal 5: User Input
Terminal 6: User Comm

5

USER

6

USER COMM

3.3 SETPOINT (OUTPUT) WIRING

The setpoint relays use a six position terminal block (TBB) located inside the

(right side).

N.C. 1

Terminal 1: NC 1
Terminal 2: NO 2
Terminal 3: Relay 1 Common
Terminal 4: NC 1
Terminal 5: NO 2
Terminal 6: Relay 2 Common

1

2

N.O. 1

COMM 1

3

N.C. 2

4

5

N.O. 2

COMM 2

6

TBB

TBC

+

5

-

USER

6

USER COMM

TBC

3.4 INPUT WIRING

Before connecting signal wires, the Input Range Jumper should be verified

for proper position.

TBC

VOLT INPUT

INPUT COMMON

CURRENT INPUT

+24 VDC EXC.

USER INPUT

USER/EXC. COMMON

1

2

3

4

20 V/200 V
10 V
200 MV/2 V
200 µA
2 MA
20 MA
200 MA

5

6

3.5 INPUT SIGNAL WIRING

Voltage Signal
(self powered)

Terminal 1: +VDC
Terminal 2: -VDC

Current Signal
(self powered)

Terminal 3: +ADC
Terminal 2: -ADC

Current Signal (2 wire
requiring excitation)

Terminal 4: +EXC
Terminal 3: +ADC

CAUTION: Analog common is NOT isolated from user input

common. In order to preserve the safety of the meter application,
the DC common must be suitably isolated from hazardous live
earth referenced voltage; or input common must be at protective
earth ground potential. If not, hazardous voltage may be present
at the User Input and Input Common terminals. Appropriate
considerations must then be given to the potential of the input
common with respect to earth ground. Always connect the
analog signal common to terminal 2.

Current Signal (3 wire
requiring excitation)

Terminal 3: +ADC (signal)
Terminal 2: -ADC (common)
Terminal 4: +EXC

VOLT

1 2

+

-

200 VDC MAX.

ANALOG COMM

2

200 MA DC MAX.

ANALOG COMM

CURRENT

3

Load

+

-

CURRENT

3

2 WIRE

TRANSMITTER

-

+ EXC.

4

+

out

ANALOG COMM

2

CURRENT

34

COMM

I

out

+ EXC.

Voltage Signal (3 wire
requiring excitation)

Terminal 1: +VDC (signal)
Terminal 2: -VDC (common)
Terminal 4: +EXC

4

VOLT

1

V

3 WIRE TRANSMITTER

3.6 SERIAL WIRING

TBD

A

COMM

RXD

TXD

4

2

3

1

B

5

232

485

5

LD METER RECEIVING DEVICE

+5V

4

47K

47K

3

B (-)

A (+)

COMM.*

Transmit
Enable

* OPTIONAL

1

TXD

RXD

COMM.

LD METER (DTE)

RECEIVING DEVICE

2

RXD

TXD

3

32

75

5

DTE

3

2

DB9

2

3

DTEDCE

DB25DB25

The serial connections are made via terminal block TBD located inside the

unit on the left side for the LD2 and on the right side for the LD4.

Terminal Block Connection Figure

RS485 Communications

The RS485 communication standard allows the connection of up to 32
devices on a single pair of wires, distances up to 4,000 ft. and data rates as high
as 10M baud (the LDA is limited to 38.4k baud). The same pair of wires is used
to both transmit and receive data. RS485 is therefore always half-duplex, that is,
data cannot be received and transmitted simultaneously.

RS232 Communications

RS232 is intended to allow two devices to communicate over distances up to
50 feet. Data T erminal Equipment (DTE) transmits data on the T ransmitted Data
(TXD) line and receives data on the Received Data (RXD) line. Data Computer
Equipment (DCE) receives data on the TXD line and transmits data on the RXD
line. The LD emulates a DTE. If the other device connected to the meter also
emulates a DTE, the TXD and RXD lines must be interchanged for
communications to take place. This is known as a null modem connection. Most
printers emulate a DCE device while most computers emulate a DTE device.

Some devices cannot accept more than two or three characters in succession
without a pause in between. In these cases, the meter employs a busy function.

As the meter begins to transmit data, the RXD line (RS232) is monitored to
determine if the receiving device is “busy”. The receiving device asserts that it
is busy by setting the RXD line to a space condition (logic 0). The meter then
suspends transmission until the RXD line is released by the receiving device.

Terminal Block Connection Figure

4.0 REVIEWING THE FRONT BUTTONS AND DISPLAY

OPERATING MODE DISPLAY DESIGNATORS

MAX - Maximum display capture value
MIN

Pressing the SEL button toggles the meter through the selected displays. If display scroll is enabled, the display will toggle automatically every four seconds

between the enabled display values.

BUTTON DISPLAY MODE OPERATION PROGRAMMING MODE OPERATION

PAR Access Programming Mode Store selected parameter and index to next parameter
SEL
RST

- Minimum display capture value

Index display through selected displays

Resets display

Advance through selection list/select digit position in
parameter value

Increment selected digit of parameter value

“1” - To the left of the display indicates setpoint 1 output activated.
“2” - To the left of the display indicates setpoint 2 output activated.

5

5.0 PROGRAMMING THE METER

Parameters

Output

Setpoint

Parameters

Signal Input

Pro

DISPLAY

MODE

Panel Key

Function

Parameters

3-dSP

Parameters

Display and Front

NO

PAR

RST

PAR PAR PAR PAR

2-SEC

1-INP

4-SPt

5-SEr

PAR

Serial

Setup

Parameters

Secondary

Display

Decimal

Point

Filter

Setting

Filter
Band

Input Value

for Scaling

Point 1

Display Value

For Scaling

Point 1

User Input

Assignment

Input

Range

PAR

rANGE

dECPt

FILtr

bANd

INP 1

dSP 1

INP 2

U-ASN

1-INP

Pro

User Input

Function

dSP 2

USrIN

Input Value

for Scaling

Point 2

Display Value

For Scaling

Point 2

StYLE

Scaling

Style

OFSEt

Display

Offset
Value

U-Act

User Input

Active Level

OVERVIEW

PROGRAMMING MENU

PROGRAMMING MODE ENTRY (PAR BUTTON)

It is recommended all programming changes be made off line, or before
installation. The meter normally operates in the Display Mode. No parameters
can be programmed in this mode. The Programming Mode is entered by
pressing the PAR button. If it is not accessible, then it is locked by either a
security code or a hardware lock.

MODULE ENTRY (SEL & PAR BUTTONS)

The Programming Menu is organized into five modules. These modules group
together parameters that are related in function. The display will alternate between

 and the present module. The SEL button is used to select the desired

module. The displayed module is entered by pressing the PAR button.

MODULE MENU (PAR BUTTON)

Each module has a separate module menu (which is shown at the start of each
module discussion). The PAR button is pressed to advance to a particular
parameter to be changed, without changing the programming of preceding
parameters. After completing a module, the display will return to  .
Programming may continue by accessing additional modules.

SELECTION / VALUE ENTRY

For each parameter, the display alternates between the present parameter and
the selections/value for that parameter. The SEL and RST buttons are used to
move through the selections/values for that parameter. Pressing the PAR button,
stores and activates the displayed selection/value. This also advances the meter to
the next parameter.

For numeric values, the value is displayed with one digit flashing (initially
the right most digit). Pressing the RST button increments the digit by one or
the user can hold the RST button and the digit will automatically scroll. The

SEL button will select the next digit to the left. Pressing the PAR button will

enter the value and move to the next parameter.

PROGRAMMING MODE EXIT (PAR BUTTON)

The Programming Mode is exited by pressing the PAR button with Pro NO
displayed. This will commit any stored parameter changes to memory and
return the meter to the Display Mode. (If power loss occurs before returning to
the Display Mode, verify recent parameter changes.)

PROGRAMMING TIPS

It is recommended to start with Module 1 and proceed through each module in
sequence. When programming is complete, it is recommended to record the
parameter programming and lock out parameter programming with the user input
or programming security code.

FACTORY SETTINGS

Factory Settings may be completely restored in Module 2. This is useful
when encountering programming problems.

ALTERNATING SELECTION DISPLAY

In the explanation of the modules, the following dual display with arrows will
appear. This is used to illustrate the display alternating between the parameter
on top and the parameter’s Factory Setting on the bottom. In most cases,
selections and values for the parameter will be listed on the right.

Indicates Program Mode Alternating Display

Parameter

USrIN



Factory Settings are shown.



N0

Selection/Value

5.1 MODULE 1 - SIGNAL INPUT PARAMETERS (1-INP)

PARAMETER MENU

INPUT RANGE

rAN6E





200v

SELECTION

200uA

0.002A

0.2u
2u

10u

Select the input range that corresponds to the external signal. This selection
should be high enough to avoid input signal overload but low enough for the
desired input resolution. This selection and the position of the Input Range
Jumper must match.

RANGE

RESOLUTION

200.00 A

2.0000 mA

200.00 mV

2.0000 V

10.000 V

SELECTION

0.02A

0.2A
20u

200u

RANGE

RESOLUTION

20.000 mA

200.00 mA

20.000 V

200.00 V

dECPt



selection also affects the dSP1 and dSP2 parameters and setpoint values and offset value.

OFSEt



compensate for signal variations or sensor errors. This value is automatically

6

0.00

Select the decimal point location for the Input, MIN and MAX displays. This

0.00

The display can be corrected with an offset value. This can be used to

DISPLAY DECIMAL POINT



DISPLAY OFFSET VALUE



-19999 to 19999

0.000 0.00000.000.00

updated after a Zero Display to show how far the display is offset. A value of
zero removes the effects of offset. The decimal point follows the dECPt selection.

FILTER SETTING

FILtr



If the displayed value is difficult to read due to small process variations or
noise, increased levels of filtering will help to stabilize the display. Software
filtering effectively combines a fraction of the current input reading with a
fraction of the previous displayed reading to generate the new display.

Filter values represent no filtering (0), up to heavy filtering (3). A value of 1
for the filter uses 1/4 of the new input and 3/4 of the previous display to generate
the new display. A filter value of 2 uses 1/8 new and 7/8 previous. A filter value
of 3 uses 1/16 new and 15/16 previous.



0,1 2 3

1

DISPLAY VALUE FOR SCALING POINT 2

dSP 2



Enter the second Display Value by using the front panel buttons. This is the
same for KEY and APLY scaling styles. The decimal point follows the dECPt
selection.

General Notes on Scaling

1. When using the Apply (APLY) scaling style, input values for scaling points

must be confined to the range limits shown.

2. The same Input Value should not correspond to more than one Display Value.

(Example: 20 mA can not equal 0 and 20.)

3. For input levels beyond the programmed Input Values, the meter extends the

Display Value by calculating the slope from the two coordinate pairs (INP1 /

dSP1 & INP2 / dSP2).



100.00

-19999 to 99999

FILTER BAND

bANd



The filter will adapt to variations in the input signal. When the variation
exceeds the input filter band value, the filter disengages. When the variation
becomes less than the band value, the filter engages again. This allows for a
stable readout, but permits the display to settle rapidly after a large process
change. The value of the band is in display units, independent of the Display
Decimal Point position. A band setting of ‘0’ keeps the filter permanently
engaged at the filter level selected above.

StYLE



If Input Values and corresponding Display Values are known, the Key-in
(KEY) scaling style can be used. This allows scaling without the presence or
changing of the input signal. If Input Values have to be derived from the actual
input signal source or simulator, the Apply (APLY) scaling style must be used.

INP 1



For Key-in (KEY) style, enter the first Input Value using the front panel buttons.

(The Input Range selection sets the decimal location for the Input Value).

For Apply (APLY) style, the meter shows the previously stored Input Value. To
retain this value, press the SEL button to advance to the next parameter. To
change the Input Value, press the
meter. Adjust the signal source externally until the desired Input Value appears.
Press the SEL button to enter the value being displayed.

dSP 1



Enter the first Display Value by using the front panel buttons. This is the same
for KEY and APLY scaling styles. The decimal point follows the dECPt selection.

INP 2



For Key-in (KEY) style, enter the known second Input Value using the front
panel buttons.

For Apply (APLY) style, the meter shows the previously stored Input Value for
Scaling Point 2. To retain this value, press the SEL button to advance to the
next parameter. To change the Input Value, press the RST button and apply the
input signal to the meter. Adjust the signal source externally until the desired
Input Value appears. Press the SEL button to enter the value being displayed.



0 to 199 display units

10

SCALING STYLE



KEy APLY

KEy

INPUT VALUE FOR SCALING POINT 1



0 to 29999

0.00

RST button and apply the input signal to the

DISPLAY VALUE FOR SCALING POINT 1



-19999 to 99999

0.00

INPUT VALUE FOR SCALING POINT 2



0 to 29999

100.00

USER INPUT FUNCTION

USrIN



P-Loc

ZErO

rESEt

d-HLd

d-SEL

d-LEV

Print

P-r5t
rSt-1

rSt-2
rSt12

U-ASN



Select the value(s) to which the User Input Function is assigned. The User
Input Assignment only applies if a selection of reset, display hold, or print and
reset is selected in the User Input Function menu.

U-Act



Select whether the user input is configured as active low or active high.



NO

MODEDISPLAY

No Function

NO

Program Mode Lock-out

Zero Input
(Edge triggered)

Reset (Edge triggered)

Display Hold

Display Select
(Edge Triggered)

Display Intensity Level
(Edge Triggered)

Print Request

Print and Reset

Setpoint 1 Reset

Setpoint 2 Reset

Setpoint 1 and 2 Reset

USER INPUT ASSIGNMENT



dSP

USER INPUT ACTIVE LEVEL



LO

DESCRIPTION

User Input disabled.

See Programming Mode Access chart
(Module 3).

Zero the Input Display value causing
Display Reading to be Offset.

Resets the assigned value(s) to the current
input value.

Holds the assigned display, but all other
meter functions continue as long as
activated (maintained action).

Advance once for each activation.

Increase intensity one level for each
activation.

Serial transmit of the active parameters
selected in the Print Options menu
(Module 5).

Same as Print Request followed by a
momentary reset of the assigned value(s).

Resets setpoint 1 output.

Resets setpoint 2 output.

Reset both setpoint 1 and 2 outputs.

HI-LO HI

dSPLO

LO HI

7

5.2 MODULE 2 - SECONDARY FUNCTION PARAMETERS (2-SEC)

PAR

Max Capture

Delay Time

Max Display

Enable

Min Display

Enable

Access Code

For Service

Operations

Min Capture

Delay TIme

Factory

Service

Operations

2-SEC

HI-En HI-t

LO-En LO-t FCS

CodE

Pro

PARAMETER MENU

MAX DISPLAY ENABLE

HI-En



Enables the Maximum Display Capture capability.

HI-t



When the Input Display is above the present MAX value for the entered
delay time, the meter will capture that display value as the new MAX reading.
A delay time helps to avoid false captures of sudden short spikes.

LO-En



Enables the Minimum Display Capture capability.

LO-t



When the Input Display is below the present MIN value for the entered delay
time, the meter will capture that display value as the new MIN reading. A delay
time helps to avoid false captures of sudden short spikes.

FCS



Select yES to perform either of the Factory Service Operations shown below.

CodE



CodE





YESNO

NO

MAX CAPTURE DELAY TIME



0.0 to 999.9 seconds

2.0

MIN DISPLAY ENABLE



YESNO

NO

MIN CAPTURE DELAY TIME



0.0 to 999.9 seconds

2.0

FACTORY SERVICE OPERATIONS



yESNO

NO

RESTORE FACTORY DEFAULT SETTINGS



66



50

Entering Code 66 will overwrite all user settings with
the factory settings. The meter will display rESEt and then
return to

CodE 00. Press the PAR button to exit the module.

VIEW MODEL AND VERSION DISPLAY

Entering Code 50 will display the model (LDA) and
version (x.x) of the meter. The display then returns to

CodE 00. Press the PAR button to exit the module.

CALIBRATION

CodE



every 1 to 2 years should be sufficient.

Calibration of the LD involves a calibration which should only be performed
by individuals experienced in calibrating electronic equipment. Allow 30 minute
warm up before performing any calibration related procedure. The following
procedures should be performed at an ambient temperature of 15 to 35 °C (59 to
95 °F).

CAUTION: The accuracy of the calibration equipment will directly affect the

Current Calibration

1. Connect the negative lead of a precision DC current source with an accuracy

of 0.01% or better to the COMM terminal. Leave the positive lead of the DC

current source unconnected.

2. With the display at CodE 48, press the PAR button. Unit will display CAL NO

3. Press the RST button to select the range to be calibrated.

4. Press the PAR button. Display reads 0.0A

5. With the positive lead of the DC current source unconnected, press PAR.

Display reads CALC for about 8 seconds.

6. When the display reads the selected range, connect the positive lead of the DC

current source to the current input and apply full-scale input signal for the

range. (Note: For 200 mA range, apply 100 mA as indicated on the display.)

Press PAR. Display reads CALC for about 8 seconds.

7. Repeat steps 3 through 6 for each input range to be calibrated. When display

reads CAL NO, press the PAR button to exit calibration.

Voltage Calibration

1. Connect a precision DC voltage source with an accuracy of 0.01% or better

to the volt input and COMM terminals of the LD. Set the output of the voltage

source to zero.

2. With the display at

3. Press the RST button to select the range to be calibrated.

4. Press the PAR button. Display reads 0.0v.

5. With the voltage source set to zero (or a dead short applied to the input), press

PAR. Display reads CALC for about 8 seconds.

6. When the display reads the selected range, apply full-scale input signal for the

range. (Note: For 200V range, apply 100V as indicated on the display.) Press

PAR. Display reads CALC for about 8 seconds.

7. Repeat steps 3 through 6 for each input range to be calibrated. When display

reads CAL NO, press the PAR button to exit calibration



48

accuracy of the LD.

The LD uses stored calibration values to provide accurate
measurements. Over time, the electrical characteristics of
the components inside the LD will slowly change with the
result that the stored calibration values no longer accurately
define the input circuit. For most applications, recalibration

CodE 48, press the PAR button. Unit will display CAL NO.

8

5.3 MODULE 3 - DISPLAY AND FRONT PANEL BUTTON

PAR

Pro

Front Panel

Display

Select Enable

Display

Update Time

Front Panel

Reset Enable

Programming

Security Code

Zero Display

W/Display

Reset

3-dSP

dSP-t SEL rSt ZErO CodE

Display

Intensity

Level

d-LEVScroL

Display

Scroll

Enable

P

ARAMETERS (3-dSP)

PARAMETER MENU

DISPLAY UPDATE TIME

dSP-t



This parameter sets the display update time in seconds.

SEL



The yES selection allows the SEL button to toggle through the enabled

displays.

rSt



This selection allows the RST button to reset the selected value(s).

ZErO



This parameter enables the RST button or user input to zero the input display

value, causing the display reading to be offset.

Note: For this parameter to operate, the RST button or User Input being used
must be set to dSP and the Input value must be displayed. If these conditions are
not met, the display will not zero.



0.5

1

2

seconds

1

FRONT PANEL DISPLAY SELECT ENABLE (SEL)



yES

FRONT PANEL RESET ENABLE (RST)



yES NO

NO dSP
HI

LO
HI-LO

dSP

ZERO DISPLAY WITH DISPLAY RESET



NO

yES NO

CodE



The Security Code determines the programming mode and the accessibility
of programming parameters. This code can be used along with the Program
Mode Lock-out (P-Loc) in the User Input Function parameter (Module 1).

Two programming modes are available. Full Programming mode allows all
parameters to be viewed and modified. Quick Programming mode permits only
the Setpoint values to be modified, but allows direct access to these values
without having to enter Full Programming mode.

Programming a Security Code other than 0, requires this code to be entered
at the CodE prompt in order to access Full Programming mode. Depending on the
code value, Quick Programming may be accessible before the CodE prompt
appears (see chart).

USER INPUT

FUNCTION

not P-Loc

000

USER INPUT

P-Loc

Not Active 0-999

PROGRAMMING SECURITY CODE



STATE

______

Active

000 to 999

SECURITY

CODE

0

1-99

100-999

0

1-99

100-999

MODE WHEN “SEL”

BUTTON IS PRESSED

Full Programming Immediate Access

Quick Programming

CodE prompt

Programming Lock No Access

Quick Programming No Access

CodE prompt

Full Programming Immediate Access

FULL PROGRAMMING

MODE ACCESS

After Quick Programming
with correct code entry at

CodE prompt *

With correct code entry

CodE prompt *

at

With correct code entry

CodE prompt *

at

DISPLAY SCROLL ENABLE

ScroL



The yES selection allows the display to automatically scroll through the
enabled displays. The scroll rate is every 4 seconds. This parameter only appears
when the MAX or MIN displays are enabled.

d-LEV



Enter the desired Display Intensity Level (1-5). The display will actively dim
or brighten as levels are changed.



NO



yES NO

DISPLAY INTENSITY LEVEL

1 to 5

5

9

OUTPUT

STATE

OFF

ON

Hys

SP + Hys

SP

OFF

TRIGGER POINTS

OUTPUT

STATE

OFF

ON

Hys

SP

SP - Hys

OFF

TRIGGER POINTS

5.4 MODULE 4 - SETPOINT OUTPUT PARAMETERS (4-SPt)

PAR

Setpoint

Action

Setpoint

Select

Setpoint

Value

Output Reset

Action

Hysteresis

Value

Off Time

Delay

On Time

Delay

Output Reset

W/Display

Reset

SPSEL

4-SPt

Act-n SPt-n HYS-n tON-n tOF-n rSt-n rEn-n

Pro

Standby

Operation

Stb-n

Enb-n

Setpoint

Enable

OUTPUT

STATE

OFF

ON

Hys

SP + ½Hys

SP

SP - ½Hys

OFF

TRIGGER POINTS

OUTPUT

STATE

OFF

ON

Hys

SP + ½Hys

SP

SP - ½Hys

OFF

TRIGGER POINTS

PARAMETER MENU

SETPOINT SELECT

SPSEL



Enter the setpoint (output) to be programmed. The n in the following
parameters will reflect the chosen setpoint number. After the chosen setpoint
is completely programmed, the display will return to SPSEL. Repeat steps for
each setpoint to be programmed. Select



NO

NO SP-1 SP-2

NO to exit the module.

SETPOINT ENABLE

Enb-n



Select YES to enable Setpoint n and access the setup parameters. If NO is
selected, the unit returns to SPSEL and Setpoint n is disabled.



NO

YES NO

SETPOINT ACTION

Act-n



Enter the action for the selected setpoint (output). See Setpoint Output
Figures for a visual detail of each action.



HI-Ub

HI-bL
LO-bL
HI-Ub
LO-Ub

HI-bL LO-bL HI-Ub LO-Ub

High Acting, with balanced hysteresis

=

Low Acting, with balanced hysteresis

=

High Acting, with unbalanced hysteresis

=

Low Acting, with unbalanced hysteresis

=

SETPOINT VALUE

SPt-n



Enter the desired setpoint value. The decimal point position for the setpoint

and hysteresis values follow the selection set in Module 1.



100

-19999 to 99999

HYSTERESIS VALUE

HYS-n



Enter desired hysteresis value. See Setpoint Output Figures for visual
explanation of how setpoint output actions (balanced and unbalanced) are
affected by the hysteresis. When the setpoint is a control output, usually
balanced hysteresis is used. For alarm applications, usually unbalanced
hysteresis is used. For unbalanced hysteresis modes, the hysteresis functions on
the low side for high acting setpoints and functions on the high side for low
acting setpoints.

Note: Hysteresis eliminates output chatter at the switch point, while time delay

can be used to prevent false triggering during process transient events.



1 to 59999

2

ON TIME DELAY

tON-n



Enter the time value in seconds that the output is delayed from turning on
after the trigger point is reached. A value of 0.0 allows the meter to update the
output status per the response time listed in the Specifications.



0.0

0.0 to 599.9 seconds

High Acting (Balanced Hys) = HI-bL

High Acting (Unbalanced Hys) = HI-Ub

OFF TIME DELAY



0.0

Low Acting (Balanced Hys) = LO-bL

tOF-n



Enter the time value in seconds that the output is delayed from turning off
after the trigger point is reached. A value of 0.0 allows the meter to update the
output status per the response time listed in the Specifications.

OUTPUT RESET ACTION

rSt-n





Auto

Enter the reset action of the output. See figure for details.

Auto = Automatic action; This action allows the output to automatically reset of f

at the trigger points per the Setpoint Action shown in Setpoint Output

Low Acting (Unbalanced Hys) = LO-Ub

Figures. The “on” output may be manually reset (off) immediately by the
front panel
point is crossed again.

RST button or user input.The output remains off until the trigger

LAtCH = Latch with immediate reset action; This action latches the output on at

the trigger point per the Setpoint Action shown in Setpoint Output Figures.
Latch means that the output can only be turned off by the front panel RST
button or user input manual reset, serial reset command or meter power cycle.
When the user input or RST button is activated (momentary action), the

10

0.0 to 599.9 seconds

LAtCHAuto L-dLY

OUTPUT

STATE

OFF

ON

Hys

SP

Auto

OFF

ON

OFF

OFF

ON

OFF

ON

OFF

OFF

ON

OFF

ON

OFF

MANUAL
RESET

LAtCH

L-dLY

SP - Hys

( )

( )

( )

{

PAR

Data BitBaud Rate Parity Bit Print

Options

Meter

Address

Abbreviated

Printing

5-SEr

bAUd dAtA

PAr Addr Abbr

OPt

Pro

corresponding “on” output is reset immediately and remains off until the
trigger point is crossed again. (Previously latched alarms will be off if power
up Display Value is lower than setpoint value.)

L-dLY = Latch with delay reset action; This action latches the output on at the

trigger point per the Setpoint Action shown in Setpoint Output Figures. Latch
means that the output can only be turned off by the front panel
or user input manual reset, serial reset command or meter power cycle. When
the user input or RST button is activated (momentary action), the meter
delays the event until the corresponding “on” output crosses the trigger off
point. (Previously latched outputs are off if power up Display Value is lower
than setpoint value. During a power cycle, the meter erases a previous
reset if it is not activated at power up.)

RST button

L-dLY

OUTPUT RESET WITH DISPLAY RESET

rEn-n



This parameter enables the RST button or user input to reset the output when

the display is reset.

Note: For this parameter to operate, the RST button or User Input being used
must be set to
not met, the output will not reset.



YESNO

YES

dSP and the Input value must be displayed. If these conditions are

STANDBY OPERATION

Stb-n



When YES, the output is disabled (after a power up) until the trigger point is
crossed. Once the output is on, the output operates normally per the Setpoint
Action and Output Reset Action.

Setpoint Output Reset Actions



NO

5.5 MODULE 5 - SERIAL SETUP PARAMETERS (5-SEr)

PARAMETER MENU

YESNO

Module 5 is the programming module for the Serial Communications
Parameters. These parameters are used to match the serial settings of the LD
with those of the host computer or other serial device.

bAUd



Normally, the baud rate is set to the highest value that all of the serial
communications equipment is capable of transmitting and receiving.

9600

Set the baud rate to match that of other serial communications equipment.

dAtA



Select either 7- or 8-bit data word length. Set the word length to match the

other serial communications equipment on the serial link.



BAUD RATE

1200300
2400600

4800
9600

19200
38400

PAr



This parameter only appears when the Data Bit parameter is set to a 7-bit
data word length. Set the parity bit to match that of the other serial equipment
on the serial link. The meter ignores parity when receiving data and sets the
parity bit for outgoing data. If parity is set to NO, an additional stop bit is used
to force the frame size to 10 bits.

11



7-bit



Odd

DATA BIT

8-bit7-bit

PARITY BIT

EVENOddNO

METER ADDRESS

Addr



Enter the serial node address. With a single unit, an address is not needed
and a value of zero can be used (RS232 applications). Otherwise, with multiple
bussed units, a unique address number must be assigned to each meter. The
node address applies specifically to RS485 applications.



00

0 to 99

ABBREVIATED PRINTING

Abbr



This parameter determines the formatting of data transmitted from the meter

in response to a Transmit Value command or a Block Print Request. Select NO

for a full print transmission, consisting of the meter address, mnemonics, and
parameter data. Select YES for abbreviated print transmissions, consisting of the
parameter data only. This setting is applied to all the parameters selected in the
PRINT OPTIONS. (Note: If the meter address is 0, the address will not be sent
during a full transmission.)



NO

YESNO

PRINT OPTIONS

OPt



This parameter selects the meter values transmitted in response to a Print
Request. A print request is also referred to as a block print because more than
one parameter can be sent to a printer or computer as a block.

Selecting
in the print block. All active parameters entered as
transmitted during a block print. Parameters entered as

The “Print All” (P ALL) option selects all meter values for transmitting (YES),
without having to individually select each parameter in the sublist.

Note: Inactive parameters will not be sent regardless of the print option
setting. The Setpoint value will not be sent unless the setpoint is enabled



NO

YES displays a sublist for choosing the meter parameters to appear

DISPLAY DESCRIPTION

HI
LO

Input

Maximum

Minimum

Setpoint 1

Setpoint 2

INP

SPt-1
SPt-2

YESNO

FACTORY

SETTING

YES

NO
NO
NO
NO

YES in the sublist will be

NO will not be sent.

MNEMONIC

INP

MAX

MIN

SP1

SP2

Sending Serial Commands and Data

When sending commands to the meter, a string containing at least one
command character must be constructed. A command string consists of a
command character, a value identifier, numerical data (if writing data to the
meter) followed by a command terminator character, * or $.

Command Chart

Command Description Notes

Node (meter)

N

Address Specifier

T Transmit Value (read)

V Value Change (write)

R Reset

Block Print Request

P

(read)

Command String Construction

The command string must be constructed in a specific sequence. The meter
does not respond with an error message to illegal commands. The following
procedure details construction of a command string:

1. The first 2 or 3 characters consist of the Node Address Specifier (N) followed

by a 1 or 2 character node address number. The node address number of the

meter is programmable. If the node address is 0, this command and the node

address itself may be omitted. This is the only command that may be used in

conjunction with other commands.

2. After the optional address specifier, the next character is the command

character.

3. The next character is the register ID. This identifies the register that the

command affects. The P command does not require a register ID character. It

prints all the active selections chosen in the Print Options menu parameter.

4. If constructing a value change command (writing data), the numeric data is

sent next.

5. All command strings must be terminated with the string termination

characters * or $. The meter does not begin processing the command string

until this character is received. See timing diagram figure

Address a specific meter. Must be
followed by one or two digit node
address. Not required when node
address = 0.
Read a register from the meter. Must
be followed by a register ID character.

Write to register of the meter. Must be
followed by a register ID character and
numeric data.

Reset a min or max value or the
output. Must be followed by a register
ID character

Initiates a block print output. Registers
in the print block are selected in Print
Options.

Register Identification Chart

ID Value Description MNEMONIC

A Input INP T, R 5 digit

B Maximum MAX T, R 5 digit

C Minimum MIN T, R 5 digit

D Setpoint 1 SP1 T, R, V 5 digit positive/4 digit negative

E Setpoint 2 SP2 T, R, V 5 digit positive/4 digit negative

Applicable

Commands

Transmit Details (T and V)

Command String Examples:

1. Node address = 17, Write 350 to the Setpoint 1 value
String: N17VD350$

2. Node address = 5, Read Input, response time of 50 msec min
String: N5TA*

3. Node address = 31, Request a Block Print Output, response time of 2 msec min
String: N31P$

Transmitting Data to the Meter

Numeric data sent to the meter must be limited to transmit details listed in the
Register Identification Chart. Leading zeros are ignored. Negative numbers
must have a minus sign. The meter ignores any decimal point and conforms the
number to the scaled resolution. (For example: The meter’s scaled decimal point
position is set for 0.0 and 25 is written to a register. The value of the register is
now 2.5. In this case, write a value of 250 to equal 25.0).

Note: Since the meter does not issue a reply to value change commands, follow

with a transmit value command for readback verification.

12

Ready Ready

1

t t

2

Ready

t

1

t

2

Ready

t

3

Command

String

Transmission

Meter

Response

Time

Command

Terminator

Received

First

Character

of Reply

Reply

Transmission

NO REPLY FROM METER

RESPONSE FROM METER

Receiving Data From The Meter

Data is transmitted from the meter in response to either a transmit command
(T), a block print request command (P) or a User Input print request. The
response from the meter is either a full field transmission or an abbreviated
transmission, depending on the selection chosen in Module 5.

Full Field Transmission

DescriptionByte

2 byte Node Address field [00-99]1, 2

<SP> (Space)3

3 byte Register Mnemonic field4-6

9 byte data field; 7 bytes for number, one byte for sign, one byte for

7-15

decimal point

<CR> (carriage return)16

<LF> (line feed)17

<SP>* (Space)18

<CR>* (carriage return)19

<LF>* (line feed)20

* These characters only appear in the last line of a block print.

The first two characters transmitted are the meter address. If the address
assigned is 0, two spaces are substituted. A space follows the meter address field.
The next three characters are the register mnemonic, as shown in the Register
Identification Chart.

The numeric data is transmitted next. The numeric field (bytes 7 to 15) is 9
characters long. This field consists of a minus sign (for negative values), a
floating decimal point (if applicable), and five positions for the requested value.
The data within bytes 9 to 15 is right-aligned with leading spaces for any
unfilled positions. When a requested value exceeds the meter’s display limits,
decimal points are transmitted instead of a numeric value.

The end of the response string is terminated with a <CR> and <LF>. After the
last line of a block print, an extra <SP>, <CR> and <LF> are added to provide
separation between the print blocks.

Abbreviated Transmission

DescriptionByte

9 byte data field, 7 bytes for number, one byte for sign, one

1-9

byte for decimal point
<CR> (carriage return)10

<LF> (line feed)11

<SP>* (Space)12

<CR>* (carriage return)13

<LF>* (line feed)14

* These characters only appear in the last line of a block print.

The abbreviated response suppresses the node address and register ID,

leaving only the numeric part of the response.

Meter Response Examples:

1. Node address = 17, full field response, Input = 875
17 INP 875 <CR><LF>

2. Node address = 0, full field response, Setpoint 1 = -250.5
SP1 -250.5<CR><LF>

3. Node address = 0, abbreviated response, Setpoint 2 = 250, last line of block

print 250<CR><LF><SP><CR><LF>

Command Response Time

The meter can only receive data or transmit data at any one time (half-duplex
operation). During RS232 transmissions, the meter ignores commands while
transmitting data, but instead uses RXD as a busy signal. When sending
commands and data to the meter, a delay must be imposed before sending
another command. This allows enough time for the meter to process the
command and prepare for the next command.

At the start of the time interval t
string to the com port, thus initiating a transmission. During t1, the command
characters are under transmission and at the end of this period, the command
terminating character (* or $) is received by the meter. The time duration of t1
is dependent on the number of characters and baud rate of the channel.

t1 = (10 times the # of characters) / baud rate

At the start of time interval t2, the meter starts the interpretation of the
command and when complete, performs the command function. This time
interval t2 varies. If no response from the meter is expected, the meter is ready
to accept another command.

If the meter is to reply with data, the time interval t2 is controlled by the use
of the command terminating character. The ‘*’ terminating character results in
a response time of 50 msec. minimum. This allows sufficient time for the
release of the sending driver on the RS485 bus. Terminating the command line
with ‘$’ results in a response time (t2) of 2 msec. minimum. The faster response
time of this terminating character requires that sending drivers release within 2
msec. after the terminating character is received.

, the computer program prints or writes the

1

At the beginning of time interval t

character of the reply. As with t1, the time duration of t3 is dependent on the

, the meter responds with the first

3

number of characters and baud rate of the channel. At the end of t3, the meter is
ready to receive the next command.

t3 = (10 times the # of characters) / baud rate
The maximum serial throughput of the meter is limited to the sum of the

times t1, t2 and t3.

Time

Timing Diagram Figure

13

Communication Format

Data is transferred from the meter through a serial communication channel.
In serial communications, the voltage is switched between a high and low level
at a predetermined rate (baud rate) using ASCII encoding. The receiving device
reads the voltage levels at the same intervals and then translates the switched
levels back to a character. The voltage level conventions depend on the interface
standard. The table lists the voltage levels for each standard.

LOGIC RS232* RS485*INTERFACE STATE

1 TXD,RXD; -3 to -15 V a-b < -200 mVmark (idle)

0 TXD,RXD; +3 to +15 V a-b > +200 mVspace (active)

* Voltage levels at the Receiver

Data is transmitted one byte at a time with a variable idle period between
characters (0 to
an optional parity bit and one or more ending stop bits. The data format and
baud rate must match that of other equipment in order for communication to
take place. The figures list the data formats employed by the meter.

). Each ASCII character is “framed” with a beginning start bit,

Start Bit and Data Bits

Data transmission always begins with the start bit. The start bit signals the
receiving device to prepare for reception of data. One bit period later, the least
significant bit of the ASCII encoded character is transmitted, followed by the
remaining data bits. The receiving device then reads each bit position as they are
transmitted.

Parity Bit

After the data bits, the parity bit is sent. The transmitter sets the parity bit to
a zero or a one, so that the total number of ones contained in the transmission
(including the parity bit) is either even or odd. This bit is used by the receiver
to detect errors that may occur to an odd number of bits in the transmission.
However, a single parity bit cannot detect errors that may occur to an even
number of bits. Given this limitation, the parity bit is often ignored by the
receiving device. The meter ignores the parity bit of incoming data and sets the
parity bit to odd, even or none (mark parity) for outgoing data.

Stop Bit

The last character transmitted is the stop bit. The stop bit provides a single bit
period pause to allow the receiver to prepare to re-synchronize to the start of a
new transmission (start bit of next byte). The receiver then continuously looks
for the occurrence of the start bit. If 7 data bits and no parity is selected, then 2
stop bits are sent from the meter.

Character Frame Figure

14

Setpoint

Action

Setpoint

Select

Setpoint

Value

Output Reset

Action

Hysteresis

Value

O Time

Delay

On Time

Delay

Output Reset

W/Display

Reset

SPSEL

4-SPt

Act-n SPt-n HYS-n tON-n tOF-n rSt-n rEn-n

Standby

Operation

Stb-n

Front Panel

Reset Enable

Front Panel

Display

Select Enable

Display

Update Time

dSP-t SEL rSt

3-dSP

Display

Intensity

Level

d-LEV

Programming

Security Code

CodE

Filter Band

Input

Range

rANGE

Display

Decimal Point

dECPt

1-INP

Filter Setting

FILtr

bANd

USrIN

User Input

Function

Input Value

for Scaling

Point 1

INP 1 dSP 1

INP 2

U-ASN

User Input

Assignment

LO-En

Min Display

Enable

Max Capture

Delay Time

Max Display

Enable

HI-En HI-t2-SEC

Min Capture

Delay TIme

LO-t

Factory

Service

Operations

FCS

Access Code

For Service

Operations

CodE

PAr

Parity BitBaud Rate

bAUd

Data Bit

dAtA

5-SEr

Meter

Address

Addr

Abbreviated

Printing

Abbr

Print

Options

OPt

PAR

SEL

NO

Pro

Exit

Programming

End

PAR

SEL

SEL

SEL

SEL

SEL

PAR

PAR

PAR

PAR

Display Value

for Scaling

Point 1

Input Value

for Scaling

Point 2

Display Value

for Scaling

Point 2

dSP 2

OFSEt

Display Oset

Value

StYLE

Scaling Style

Zero Display

W/Display

Reset

ZErO ScroL

Display

Scroll

Enable

Enb-n

Setpoint

Enable

User Input

Active Level

U-ACt

LDA PROGRAMMING QUICK OVERVIEW

Press PAR key to enter

Programming Mode.

15

The Company warrants the products it manufactures against defects in materials and workmanship

LIMITED WARRANTY

for a period limited to two years from the date of shipment, provided the products have been stored,
handled, installed, and used under proper conditions. The Company’s liability under this limited
warranty shall extend only to the repair or replacement of a defective product, at The Company’s
option. The Company disclaims all liability for any affirmation, promise or representation with
respect to the products.

The customer agrees to hold Red Lion Controls harmless from, defend, and indemnify RLC against
damages, claims, and expenses arising out of subsequent sales of RLC products or products
containing components manufactured by RLC and based upon personal injuries, deaths, property
damage, lost profits, and other matters which Buyer, its employees, or sub-contractors are or may be
to any extent liable, including without limitation penalties imposed by the Consumer Product Safety
Act (P.L. 92-573) and liability imposed upon any person pursuant to the Magnuson-Moss Warranty
Act (P.L. 93-637), as now in effect or as amended hereafter.

No warranties expressed or implied are created with respect to The Company’s products except those
expressly contained herein. The Customer acknowledges the disclaimers and limitations contained
herein and relies on no other warranties or affirmations.

Red Lion Controls
Headquarters
20 Willow Springs Circle
York PA 17406
Tel [phone]
Fax [phone]

Red Lion Controls

Europe

Printerweg 10

NL - 3821 AD Amersfoort

Tel [phone]

Fax [phone]

Red Lion Controls

India

54, Vishvas Tenement

GST Road, New Ranip,

Ahmedabad-382480 Gujarat, India

Tel [phone]

Fax [phone]

Red Lion Controls

China

Unit 101, XinAn Plaza

Building 13, No.99 Tianzhou Road

ShangHai, P.R. China 200223

Tel [phone]

Fax [phone]