AST P250 User manual

AST P250/P450
USER MANUAL
Accurate Sensors Technologies
Non-contact Infrared Pyrometers
We measure accurate temperature in extreme conditions
AST - Accurate Sensors Technologies
Misgav Industrial Park
Tel: [phone], Fax: [phone]
Email: [e-mail]
Web: www.accuratesensors.com
, Misgav 20173, Israel

Index
1. Chapter - 1
General information
2. Chapter - 2 ....................................................................................................................... 2
Introduction
2.1 Application, range and working principle
2.2 Technical specification
2.3 Optical Data
2.4 Standard Item Supplied with AST P250/P450
3. Chapter - 3 ....................................................................................................................... 5
Operation of the pyrometer
3.1 Overview
3.1.1 Adjustment of the diopter adaptor
3.2 Installation of pyrometer
3.2.1 Battery Insertion
3.2.2 Switching On
3.2.3 Display Function
4. Chapter - 4 ....................................................................................................................... 9
A. PC Software installation
A. 4.1 Installation
A. 4.2 Parameters in main screen
A. 4.2.1 Communication
A. 4.2.2 Parameter setting
A. 4.2.3 Device information
A. 4.3 Number of Events Present
A. 4.4 Show Events
A. 4.4.1 Data
A. 4.4.2 Graph Mode
A. 4.4.3 Numeric Mode
A. 4.4.4 Save Events
A. 4.5 Clear Memory
5. Chapter - 5 ....................................................................................................................... 15
Serial Communication Protocol MT500
....................................................................................................................... 1

Congratulations on choosing this high quality and highly efficient AST pyrometer for non contact temperature
measurement.
Please read this user manual carefully, step by step, including all notes of security, operation and maintenance
before installing the pyrometer. This manual contains all the necessary instructions for set up and operation of the
pyrometer. This section provides an overview about important safety regulations.
Some Important Safety Regulations Given Below:
1. Safety Precaution :
Each person working with pyrometer must read the user manual before operation. The pyrometer has only to
be used for the purpose described in manual. The pyrometer works only with a potential free low voltage. This
voltage is not harmful for user. The pyrometer may contain harmful material and hence it should not be disposed of
with normal waste.
2. Packaging and Storage :
Always use a shock proof package for shipment of pyrometer. It should be sealed to protect it against humidity.
Also protect the lens of pyrometer with cover. They should be stored at the temperature range from -20°c to 55°c.
3. Limit of Liability and Warranty
All general information and notes for handling, maintenance and cleaning of this instrument are offered
according to the best of our knowledge and experience.
AST reserves the right to revise this document and to make change from time to time in the content hereof
without obligation to notify any person or persons of such revisions or changes. AST instruments have a warranty of
two year from the invoice date. This warranty covers manufacturing defects and faults which arise during operation
only if they are the results of defects caused by AST.
AST does not accept liability for any damages or losses which might occur, including consequential damages and
financial losses, as a result of use of the instrument.
4. Copyright :
All rights reserved. This document may contain proprietary information and shall be respected as a proprietary
document to AST with permission for review and usage given only to the rightful owner of the instrument with which
this document is associated.
Chapter - 1
General Information
1

Chapter - 2
Introduction
AST P250/P450 is specially designed highly accurate digital pyrometer to provide high performance and low
maintenance of non contact temperature measurement in demanding industrial environment.
2.1 Application, Range and Working Principle
P250/P450 are specially designed portable IR pyrometer for non contact temperature measurement between
210°C to 3000°C in demanding industrial environments. The Instruments feature high accuracy. The multi functional
bright back light additional LCD graphic display panel provides an indication of status and configuration of pyrometer
together with measurement mode. The measuring result is shown and can be analyzed directly on site.
The bright through the lens sighting gives a precise definition of the target spot.
The portable pyrometer provides fast, simple data logging with USB connectivity to download this data to PC for
analysis. The fast response time within milliseconds allow exact measurement of fast moving object. The large data
storage (data store up to 4000 values) of measurement offers the best possibility for analyzing the data.
The applications in which AST pyrometers can be used are:
Ÿ Welding
Ÿ Tempering
Ÿ Hardening
Ÿ Annealing
Ÿ Molten Glass
Ÿ Glass Moulds
Ÿ Steel
Ÿ Heater Tubes
Ÿ Reheat Furnaces
2
186
72.80
111 75
45
Ø44
229
40.50

2.2 Technical Specifications
3
Standard Item supplied with AST P250/P450 :-
þ
þ
þ
þ
þ
þ
Pyrometer with through the lens sighting.
USB interface, USB 2.0 Cable.
Calibration certificate.
Software CD and Operation manual.
Carry Box
Charger
Physical Characteristics
Environmental Specification
Electrical Specifications
Measurement Specifications
Dimensions
Weight
Housing
228 x 64 x 186 mm (L x W x H)
900g with batteries
Aluminum, Handle: ABS
Ambient Temperature
Storage Temperature
Relative Humidity
Protection Class
0 to 50°C
-20 to 55°C
10 - 95%, Non-Condensing
Conditions
IP52(Housing Exclude Handle with
battery case), IP40 (Handle)
Power Supply
CE Label
3 x 1.2 V Rechargeable Batteries
(uninterrupted operation time
approx. 10 hours with
rechargeable batteries)
According to EU Directives about
electromagnetic immunity
Model P250 P450
Temperature Range
Spectral Range
Photodetector Type
Distance to Spot Size Ratio
Emissivity (ε)
Response Time
Accuracy
Repeatability
Sighting Options
Objective
Measuring Functions
Parameters Setting Via Side
Keypad
Data Storage
Storage Interval
210°C….1350°C
250°C....1800°C
300°C....2500°C
1.6 µm
InGaAs
100:1
200:1
400:1
0.1….1.0 adjustable
5 msec in Numerical Mode
10 msec in Graphical Mode
10 msec (When data storage is ‘ON’)
± 0.3% of the measured value + 1°C
0.1% of reading in °C + 1°C
Optimized through lens view finder with dioptry
correction -2.5 dpt. to +2.5 dpt
Normal (Normal Temperature Measurement)
MAX (Maximum Temperature Measurement)
AVG (Average Temperature Measurement)
Emissivity, Peak Picker(Clear Time)(tCL), Average,
Storage Interval, Temperature Unit(°C/°F), Auto Off
Time, Date, Time
4000 Values, Storage of Measurement Value, Date,
Time, Emissivity
OFF, 10 msec, 20 msec, 100 msec, 1 sec, 10 sec, 100
sec, 500 sec
600°C…2500°C
700°C... 3000°C
1.0 µm
Si
400:1
400:1
Achromatic, adjustable from A=500 mm to 9000 mm
Effective lens aperture diameter D:16mm (distance
9000mm) to 21 mm (distance 500mm)
Display
Resolution
Serial Interface
Left side: LCD Display, 128 x 64 pixels illuminated
3 value per sec.; last value is displayed for another 10
sec after finishing measurement (Hold Function)
Additional Built in LED display in the view finder
LED inside : 0.1°C upto 1000°C after this 1°C
LCD outside : 0.1°C upto 1000°C after this 1°C
USB 2.0
(210°C….1350°C)
(250°C....1800°C)
(300°C....2500°C)
(600°C…2500°C)
(700°C... 3000°C)
Alarm Visual (LCD Blinking Facility)
Mounting Tripod

4
2.4 Standard Item supplied with AST P250/P450
The pyrometers are equipped with a high quality focusable optics. Adjusting the optics to required measuring
distance achieves the spot sizes specified in table. The adjustment can be taken via the scale on the objective or by
focusing the measuring object in the view finder. User can adjust measuring distance from 500mm - infinity ( ).∞
500 mm
infinity (∞)
Measuring distance between 500mm to
infinity ( ) with small spot size can be
achieved with the pyrometer.
∞
2.3 Optical Data
1) Sighting :- The bright through the lens sighting with spot indicator for precise targeting and built
in temperature display facilities provide good target accuracy. If user want to focus view finder which
is equipped with adjustable diopter adaptor then diopter adaptor can be adjust from min(0.5) to max
∞by rotating it.
2) Spot Size Table :- The objective can be focused to adjust within distances between 0.5m &
infinity ∞
( )
( )
Pyrometer with through
the lens sighting
USB interface,
USB 2.0 Cable
Calibration certificates
& Operation manual.
Software CD
Carry Box
Charger
3 Nos. Rechargeable Battery
Temperature
Display
Spot Indication
Spot Sizes(mm)
Measuring Distances
MD (mm)
with standard focusable optics
500
1000
2000
3000
4000
5000
9000
P250
250°C - 1800°C
(200:1)
2.5
5
10
15
20
25
45
P250
210°C - 1350°C
(100:1)
5
10
20
30
40
50
90
P450
600°C - 2500°C
700°C - 3000°C
(400:1)
P250
300°C - 2500°C
(400:1)
1.25
2.5
5
7.5
10
12.5
22.5
1.25
2.5
5
7.5
10
12.5
22.5

5
Chapter - 3
Operation of the Pyrometer
3.1 Overview
Focusable Optics
between 500 mm to ∞
Numerical or Graphical Mode
Switch
View Finder with Spot
Indication and built in Digital
Display
USB Interface for connection
with the software and
Charging the Pyrometer
Choosing the Measuring Function:
Normal Temp. Measurement, Max.
Temp. measurement, or average
Temp. measurement. Pyrometer
Parameter Setting: Emissivity,
Picker(tCL), Average, Trigger Interval,
Temp. Unit(°C/°F), Auto off time,
Date, Time Data Storage Button for
measured Temperature
Storage
Numeric Display
3.1.1 Adjustment of the Diopter adaptor
The view finder is in-built with an adjustable diopter adaptor. The diopter adjuster has no visual zero position and
has to be adjusted individually. It has to be adjusted for user to user.
Turning Right
+2.5 dpt
View finder with
diopter adaption
Turning Right
-2.5 dpt
Power Key
(ON/OFF Key)
UP & DOWN
Key
Battery Compartment
Storage Data Display Switch
Graphic Display

6
3.2 Installation of Pyrometer
For operating the pyrometer 3 batteries (rechargeable batteries)
are required (Note :- Alkaline- manganese batteries should not be
used). They must be inserted into the battery holder (Note:-
polarity of battery should be correct). And installed afterward into
the pyrometer handle (Note :- position and direction of battery
should be correct). After closing the battery case cover the
pyrometer is ready for use. The direction of battery holder shown
in figure.
3.2.1 Battery Insertion
Handle Battery Case
Battery Holder
Battery
Case Cover
Insert
Direction
3.2.2 Switching ON
The pyrometer can be switched ON/OFF by pressing power key.
Power key can be short press for ON and long press for OFF. After
switching ON, the pyrometer immediately starts measurement.
The result of the measurement is shown on LCD as well as in view
finder.
Push Button
(A) Triggering point/ Single value storage: - User will trigger the
button on handle to hold the value, the value will automatically
save into the pyrometer according to time interval.
(B) Multiple value storage :- When push button pressed
repeatedly for some time, then multiple measured values are
stored in memory of pyrometer.
( C) Continuous measurement/Continuous value storage :- While
pressing continuous key in LCD shows CONT., pyrometer will
continuously start tracing the value. The tracing indication will
shows on LCD display
(D) USB Interface :- The pyrometer is equipped with a USB
interface which can be connected with PC. The battery can be
charge through USB interface by connecting to charger provided.
Note : Before start taking measurement pyrometer must be fully
charge. The time of full charging of battery is 1.5 hour.
USB
Interface
Continuous Measurement
Display Switch

7
3.2.3 Display Functions
FUNC
A) Emissivity :- It is the E) Temperature Unit :- User can
relationship between the select °C or °F unit.
emissions of a real object and
the emission of a black Body
radiation source at the same temperature. For a
F) Memory clear :- To clear the
correct measurement it is necessary to adjust
save data from memory,
E m i s s i v i t y. E m i s s i v i t y d e p e n d s o n t h e
memory clear function is used.
surfacecondition of the material, the spectral range
By making memory clear
of the pyrometer and the measuring temperature.
function ON, Memory can be cleared.
Different material has different Emissivity ranging
from 0 to 1.0 User can change Emissivity by given
keypad on the instrument from 0.1 to 1.0. G) Set Date & time :- User can
B) Picker :- User can calculate a set correct date and time using
maximum “peak” temperature this parameter. To get Access
value from specified number to the menu for date & time
store real temperature in the keep pressing the FUNC button repeatedly.
sensor memory. User can either ON or OFF the picker.
(for more details Refer 4.2.2( C)) H) Auto Off :- User can set
auto off time of pyrometer
from 5mins. to 30mins. In this
C) Storage Interval :- Interval
mode the pyrometer will
determines whether only one
automatically off when no key is press in the time of
value will be stored when push
Auto Powered OFF. Example if user set 5 minutes in
button is pressed up-to the
Auto Off then the pyrometer will automatically
single triggering point. User can set storage interval
Powered OFF if no key is press for 5 minutes.
from 10ms to 500 Sec.
D) Average :- This parameter
help to switch ON & OFF
average measuring mode. In
addition to measured value,
show the average value of
the current measurement
process & save it, If it is in the range.
1
FUNC
The pyrometer is controlled by adjustment button on left side of instruments.
A
C
D
E
Function key :- There are different uses of function key first one, this key is use to see different
parameters in device and other one is set the value of parameter which is adjusted by UP &
DOWN key. By pressing of Func Push button brings up the following functions one after other.
They are appears in the bottom left of the LCD display in short form.
Function key adjustable parameters are below.
F
H
G

8
Continuous Key :- The pyrometer can also be used in continuous Measurement mode. To do this, after
the pyrometer switched ON press the “CONT” push button. In continuous data saving mode Auto Off
function will not work. To go back to normal measuring mode again press continues button, It shows
Hold on screen and after 10 seconds goes back to normal measuring mode.
4
NOTE :- When the continuous Push button press continuously for 5 sec then the stored values shown on LCD display
with all required parameters like date& time, emissivity, storage block etc. User can also view these stored values in
graphical or numerical mode by pressing graphical/ numerical key.
Up/ Down Key :- These key is use to change the present value of any parameter (which given in
function key) either upward or downward.
2
Graphic /Numeric key :- This key is used switch the display either graphical to numerical and Vice -
versa.
123.9
3
A) Numeric Mode :- In this B) Graphic Mode :- In graphic
measurement mode the mode temperature is shown
display always show the graphically. In addition to the
current measured value, information in the numeric display,
as well as set Emissivity. the maximum & minimum values
are also shown. The relevant Maximum & Minimum value
defines the scaling of Y-axis. The measurement curve runs in
the direction of the X-axis. Each measured value represent by
one pixel.
Mode of Operation
1) Normal measuring mode : This mode is used for normal temperature measurement.(Refer to 3.2.3.3 A)
2) Average measuring mode : when average mode is ON then LCD of device will show average temperature after
every 3sec (Refer to 3.2.3.3 D)
3) Maximum measuring mode : when peak picker is ON then LCD of device will show Max. temperature. (refer to
3.2.3.3 B)
Emissivity
Current Block + Total Number of Block
Date Of measured Values
Saved Measured Value
Add measurement Mode If any
Measured value Number + Total Number of Values in the block
Time of Measured Values
Position of Measured value

9
Chapter - 4
A. PC Software Installation
The provided AST software offers possibilities to connect pyrometer for parameter Setting, offline graph and to
evaluate measuring data.
A. 4.1 Installation
Install the pyrometer software using the installation guide file on CD ROM. After installation of the software restart
the computer and double click on application, it will open software screen.
A. 4.2. Parameters in main screen
A. 4.2.1 Communication
Communication between the AST pyrometer and the software
is implemented via USB cable connected between the
pyrometer and the PC USB port. This enables the acquisition
and recording of data, as well as the transfer of commands from
the software application to the AST pyrometer. Communication
can be done by clicking on “Communication panel" and select
correct COM Port where pyrometer is connected. Then click on
CONNECT Button.

10
A) Emissivity settings : The emissivity can be set by clicking on
"Parameters” and select or type in the desired emissivity directly in
the description field. The emissivity value will be transferred to
pyrometer by hitting the "TAB" button. The emissivity range is from
0.1 to 1.0.
For a correct measurement it is necessary to adjust the emissivity.
This emissivity is the relationship between the emission of an real
object and the emission of a black body radiation source at the same
temperature. Different materials have different emissivities ranging
between 0% and 100%. The major parameters effecting emissivity
are:
1. The surface condition of the material,Rough surfaces have higher
emissivities.
2. The spectral range of the pyrometer and the measuring
temperature.
3. The Pyrometer spot size is fully filled by measured object or not.
4. The optical losses due to any obstraction in between pyrometer &
measured object like glass window.
A. 4.2.2Parameter Setting
All user selectable device parameters can be set by using the software in the Panel "Parameter".
The emissivity setting of the pyrometer has to be adjusted accordingly. The tolerance of the emissivity values for
each material is mainly dependent on the surface conditions.
(B)Unit : User can change the measuring unit of temperature from “Centigrade" to “Fahrenheit" and vice versa.
(C)Clear time (tCL) : if the peak picker is
switched on, the highest last temperature
value will always be displayed and stored. As
such, it may be beneficial to periodically clear
and reset the stored values in order to obtain
new temperature readings. This feature is
particularly useful when object temperature
is not uniform across its dimension or the
pyrometer is not constantly viewing an
object to be measured. The peak picker works
on two buffer memory to find maximum value
over a defined interval. With the first memory,
the highest measured value is held and is deleted alternately in the time interval set (clear time). The other memory
retains the maximum value throughout the next time interval. The disadvantages of fluctuations in the display with
the clock frequency are thereby eliminated.
Note: The maximum value storage coincides with adjustments made to response time. Therefore:
(I) Clear time<= the adjusted response time is useless
(ii) Clear times must be at least 5 times longer than the response time.
(iii) Only maximum with full maximum value can be recorded, which appear at least 5 times longer than response
time.
The following setting is possible:
OFF : At clear time “OFF” the maximum value storage is switched OFF and only momentary values are measured.
10msec...25sec : Any clear time between 10msec and 25sec (please refer to Note (ii) above) when set, estimates the
maximum values and holds it in two buffer memory. After the entered time, the storage will be deleted.

11
A. 4.3 Number of Events present
In this feature all number of events are display in numeric mode which is stored in pyrometer. The maximum number
of events is store in pyrometer up to 4000.
Number of events
present
A. 4.4 Show Events
When user click on this feature all number of blocks which are store in pyrometer, shown on main screen. Each
number of blocks contain many number of events. User founds all block numbers as well as the block start time, stop
time, date & number of events which is store in particular block number on the screen.
A. 4.2.3 Device Information
Auto : “Auto” mode is used for discontinuous measuring task, such as object being transported on a conveyor belt in
such a case the maximum value for each object has to be indicated. When the object passes the measuring beam of
the pyrometer, the maximum value is stored until a new hot object appears in the measuring beam. The temperature
which has to be recognized as “hot” is defined by the low limit of the adjusted sub range. The stored maximum value
will be deleted when the temperature of the new hot object exceeds the low limit “from” of the sub range by at least
1°C. If a lower limit is not entered, the maximum value storage will be deleted whenever the low level of the full
measuring has been exceeded.
Note : Remaining all parameters are inactive & non changeable.

12
A. 4.4.1 Data
To see particular block data click on particular block number. All the data of this block shown on screen, this particular
block contain all events, Date, time, temperature and emissivity.
A. 4.4.2 Graph Mode
To see particular block data graphically, user can click on graph mode. Graph mode’s X axis denotes time scale & Y axis
denotes temperature scale.

13
A. 4.4.3 Numeric Mode
To see particular block data numerically, user can click on numeric mode. The data in this particular block contain all
events, time, temperature and emissivity.
A. 4.4.4 Save Events
To save particular block, user can click on save events. After clicking on save events, a pop-up appears on screen. The
name of file and location is user defined. The format of file is “.xls” & user can not change it.

14
A. 4.5 Clear Memory
To clear all data, blocks, events, user can click on clear memory. After clicking on clear memory all data of pyrometer
will erase.
0

15
Chapter - 5
Serial communication protocol-MT500
This protocol is developed to use in the half duplex addressable communication mode. Master device should periodically issue
requests to each Slave device. The request contains an address of polling “Slave” device. Slave device reply only on the requests
issued by the Master. Each Slave has its own address to recognize the issued request. AST sensors always operate as Slave devices.
Using RS485 serial communication option allows connecting more than one sensor to Master device. AST sensors always perform
delay of 5 ms before sending an answer on Master request to meet RS485 hardware requirement.
MT500_AST protocol uses only RD (Batch Read) and WD (Batch Write) commands. Sending other MT500 protocol commands causes
sensor to consider it as error condition and answer with unknown command reply. Symbols enclosed within apostrophes (‘symbol’)
means ASCII representation of the symbols. String enclosed with quotation mark (“string”) means ASCII representation of the string
(ended by ‘\0’). Data format is: 8 data bit, 1 stop bit, No parity, baud-rate 19200.
'0303' '01'
Clear time(tCL) Adjustable between 0 to 12, Default 0, 0=OFF, 1=Auto. 2-12 = 10msec
to 25sec [refer to page-13(clear time)]
'1801' '01'
LCD back light control ' ' ' '0000 : BL OFF; 0001 : BL ON(Default) (Only for E-series pyrometers)
Description Address Items Parameters
Emissivity '0400' '01' Object emissivity multiplied by 1000.
Refer user manual for adjustable range.
Emissivity slope parameter multiplied by 1000.
Refer user manual for adjustable range.
'0401' '01'Emissivity slope
Upper measurement range limit in °K (read only)'0100' '01'Upper basic range
Lower measurement range limit in °K (read only)
'0101' '01'
Lower basic range
Adjustable between '0001' to '0255'
'0200' '01'
Station number
Flag is used to instruct PC SW to show temperature
'0000': Centigrade (Default); '0001': Fahrenheit
'0201' '01'Temperature unit
Parameter multiplied by 10.
Adjusted between 0 and 100%, Default set to 15%.
'0107' '01'
Switch off level
'0000' = Single color; '0001' = Two color
This parameter is useless for single color sensors.
'0204' '01'Sensor mode
Temperature inside device case in °C (read only)'0006' '01'Internal temperature
Communication type selection '0F03' '01' ' ' ' '0000 :RS-485;, 0001 : RS-232 (Default)
Device name ‘1D00' ‘01' 10 Bytes “Hot end “, if less then 10 bytes pad with space at end.
Working distance (mm) ‘1D01' ‘01' 10 Bytes “1000 “, if less then 10 bytes pad with space at end.
Spot size-apperture (mm) ‘1D02' ‘01' 10 Bytes “1000-6000” if less then 10 bytes pad with space at end.
‘-’ sign between spot size and apperture is compulsory
Relative energy (read only) ‘0002' ‘01' Relative energy multiply by 1000 for 2 color pyrometers only

16
Device model number (read
only)
'0E00' '01' 10 bytes “AST450C “', if less than 10 byte pad with space at end
Firmware version '1300' '01' Firmware version number of device (read only)
Sensor serial number (read
only)
'1400' '01' 6 bytes in hex, if less than 6 bytes pad with '0' at start. Only numbers
allowed.
Device type (read only) '1301' '01' '0001': Single color; '0002' : Two color
'0003': Thermopile; '0004' : Reserved
Real temperature and status
code (read only)
'0000' '02' Calculated object temperature in °K and status of sensor (As shown in
Appendix A).
First process status code then real temperature.
Batch Read (RD)command:
Byte 1: Always STX (0x02)
Bytes 2, 3: The Station Number of the device to read from (2 Hex digits)
Bytes 4, 5: The command to execute (RD)
Bytes 6-9: This is the starting address to read from. Must be 4 bytes long
Bytes 10, 11: This is the number of addresses to read. Must be 2 bytes long
Byte 12: Always ETX (0x03)
Bytes 13, 14: The checksum is the lowest 8 bits of the sum of bytes 2 through 12
Example : Read two parameters starting from address 0000, from the station number 10 (0AH). This will read addresses 0000
and 0001.
Checksum is calculated as the lowest 8 bits of the sum of the Hex codes for bytes 2 to 12.
Reply:
The reply length is L = (N * 4) + 8, Where N = the number of requested Items.
If the command is successful, the reply length will be at least 12 bytes. It consists of the STX, followed by four bytes for each
requested item, then the ETX and Checksum.
Byte
1
STX
Bytes
2, 3
Station
Bytes
4, 5
RD
Byte
L-2
ETX
Bytes
6-9
Data 1
Bytes
10-13
Data N
Byte
L-1, L
Checksum
Byte 1
1 Byte
STX
Bytes 2,3
2 Bytes
Station ID
Bytes 4, 5
2 Bytes
RD
Bytes 6-9
4 Bytes
Address
Bytes 10, 11
2 Bytes
Items
Byte 12
1 Byte
ETX
Bytes 13, 14
2 Bytes
Checksum
Byte 1
STX
0x02
Bytes 2, 3
0A
0x30, 0x41
Bytes 4, 5
RD
0x52, 0x44
Bytes 6-9
0000
0x30,0x30,0x30,0x30
Byte 13, 14
2E
0x32, 0x43,
Byte 12
ETX
0x03
Bytes 10, 11
02
0x30, 0x32

Reply :
If the command is successful, the reply is
Byte 1
ACK
0x06
Byte 2, 3
0A
0x30, 0x41
Byte 4, 5
‘W', 'D'
0x57, 0x44
Byte 1
NAK
0x15
Byte 2, 3
0A
0x30, 0x41
Byte 4, 5
‘R', 'D'
0x52, 0x44
Byte 6
01
0x30, 0x31
in the event of an error, the reply is
Batch Write (WD) command
Byte
1
STX
Bytes
2, 3
Station ID
Bytes
4, 5
WD
Bytes
6-9
Address
Bytes
10, 11
No. of Items
Bytes
12-15
Data 1
Byte
L-2
ETX
Byte
L-1, L
Checksum
Bytes
(L-6) - (L-3)
Data N
Byte 1
STX
0x02
Bytes 2, 3
0A
0x30, 0x41
Byte 16
ETX
0x03
Bytes 6-9
0400
0x30, 0x34, 0x30, 0x30
Bytes 10, 11
01
0x30, 0x31, 0x30, 0x30
Bytes 12-15
03E8
0x30, 0x33, 0x45, 0x38
Bytes 4, 5
WD
0x57, 0x44
Byte 17,18
74
0x37, 0x34
Byte 1
NAK
0x15
Byte 2, 3
0A
0x30, 0x41
Byte 4, 5
‘W', 'D'
0x57, 0x44
Byte 6
01
0x30, 0x31
In the event of an error, the reply is
17
Reply to above command if address '0000' contains value 1497 and address '0001' contains value 0000.
Byte 1
STX
0x02
Bytes 2, 3
0A
0x30, 0x41
Bytes 4, 5
RD
0x52, 0x44
Bytes 6-9
059D
0x30,0x35,0x39,0x44
Byte 14-15
9C
0x39, 0x43
Bytes 10-13
0000
0x30, 0x30, 0x30, 0x30

18
Table 1:
Tau (τ) Analog Response Time, ms Serial Response Time, ms
1 2 20
3 6 50
5 10 100
10 20 200
30 60 300
50 100 500
100 200 1000
300 600 2000
500 1000 3000
1000 2000 4000
3000 6000 5000
5000 10000 10000
Error Codes:
Error Code
'1'
Description
Invalid check sum
Comments
See how to calculate a check sum
'5' Illegal Address number of items in a request is set to 0;
memory segment number in a request is out of 0-25;
Wrong command value, No data at requested address;
'2' Unknown command Protocol uses only RD (Batch Read) and WD (Batch
Write) commands
'7' Unsuccessful write It informs Master that it should repeat WD command
'6' More items requested
More than 99 items were requested in command
'3' Data length error Number of items in WD (Batch Write) command doesn't match
number of data bytes
'4' ETX not found ETX (0x03) not present in command