Epoch WT-PP User manual

Contacts us : email : [e-mail] , Ph: 080-23481364
Weight Transmitter User manual
Contact us :
EPOCH INSTRUMENTS AND CONTROLS PVT LTD
No. 16, Bhadrappa Estate, 54, Magadi Main Road, Kamakshipalya,
Bangalore - 560 079.
Ph : 080-23481364
Email : [e-mail]

Contacts us : email : [e-mail] , Ph: 080-23481364
Indicator Front Panel View
Initial Inspection
WEIGHT TRANSMITTER USER MANUAL VERSION-1.3
The front panel of Weighing Transmitter appears similar to one shown below:
1 - LED Display
2 - MENU/ESC key - To enter into Menu from display(Password protected) & to back from menu options
and parameter entries without storing entered values
3 - ENTER/TARE key - To enter into Menu options & Sub menus & to store the parameters values
4 - LEFT key - To select or move to the next cursor position in parameter values entry & to display peak
weight value during the main display
5 - UP key - To select next option and to increase or decrease values & to reset the peak weight during
the main display
6 - Status LED's
7 - Negative indication
STATUS LED’s Description Status
-VE
 To indicate the current weight is +ve
weight or –ve weight
ON  -ve weight
OFF+ve weight
OPEN
 To indicate the Load error(oPEn) (or)
 To indicate the display weight is Peak
weight or Current weight
ON(continuous)Load Error
ON(one time)Peak weight
OFF  Current weight
PWR  To indicate the power is ON or not ON  Power ON
OFF  Power OFF
The rear panel of Weight Transmitter appears similar to one shown below:
Ensure the following while opening the carton box: a) Weight Transmitter – 1No b)
Connectors for
ports (RS485, load cell) – 2Nos c) Side clamps – 2Nos d) User Manual – 1No

Contacts us : email : [e-mail] , Ph: 080-23481364
Technical Specification
Specification
Description
Indicator Power
Power Supply
24V DC Supply
Controller
High speed microcontroller
A/
D Converter
Type
24
-
bit Delta Sigma
Analogue Input Range
0.2mV to 25 mv
Linearity
<0.02% FS
Gain Drifting
2PPM/
◦C
Conversion Rate
12.5 SPS
Display Accuracy
1/30,000
Display & Keypads
LED Display
5 digits 7 Segment LED Display
Keypads
4 Keys, Menu/Esc Key, Enter Key, Up Key and Left Key.
Load cells
Excitation
5 V DC
Mechanical Data
Cabinet Size
129mm (
L)*48mm (H)*96mm (W)
Panel Cutout Details
45mm (H)*92mm (W)
Net Weight
200 gm
Environmental
Operating Temperature
-
10
◦C to 40◦C
Storage Temperature
-
25
◦C to 70◦C
Relative Humidity
90% R.H without dew
IP Level
Front panel IP 55

Contacts us : email : [e-mail] , Ph: 080-23481364
Menu Flow Diagram
 Menu can be accessed by using the MENU key by pressing the key continuously for 2 sec.
 Calibration accesses through hardware lock protection. Please connect and short pin no. 2
and 3 in rear panel to enable calibration.
 Two different Load calibrations available “AUTO” & “MANUAL”. Difference, in manual
calibration User need to enter Known weight count (without zero count) as span
count.

Contacts us : email : [e-mail] , Ph: 080-23481364
LOAD CALIBRATION
 Calibration accesses through hardware lock protection. Please short pin no. 7
and 8 in rear panel to enable calibration .
Accessing menus requires entering the default factory set valid 3-digit password i.e. ‘000’. It
is suggested that you change the password.
This menu will help you to calibrate load.To access load calibration menu.
S.No Instruction Display
1.  Press MENU/ESCand enter the default factory
set password ‘000’ and press ENTER/TARE.
2.  Navigate to “AUto” or “nAnUL” and press
ENTER/TARE.
 Two different Load calibrations available
“AUTO” & “MANUAL”. Difference, in manual
calibration we have to enter the span count
(Known weight count).
3.  Navigate to Maximum Capacity (n-CAP) and
press ENTER/TARE.
 Enter the max capacity of load cell within the
range (0.01-999.99). E.g., ‘020.00’
4.  Navigate to Decimal Point (d-Pt) and press
ENTER/TARE.
 Set the decimal value with the possible values
of (0, 1, 2, 3).
 You can enter the values by pressing “UP” or “SHIFT” keys.
 Press ENTER/TARE key to store the current value.
 Press MENU/ESC key to either return to previous menu or cancel the entered
values.
000
CALIb
n-CAP
020.00
d
-
Pt
2
AUto
NAnUL

Contacts us : email : [e-mail] , Ph: 080-23481364
5.  Navigate to Resolution (rSoL) and press
ENTER/TARE.
 Set the resolution value with the possible
values (1, 2, 5, 10, 20, 50 and 100). E.g., ‘2’.
6.  Navigate to Cal. Zero (CAL-0) and press
ENTER/TARE.
 Remove any load on load cell. LED displays
ADC counts corresponding to the cal. Zero
value.
 Press ENTER/TARE to set Cal. Zero.
When you calibrate Cal. Zero and Cal.
Span, wait for LED to display stable
raw ADC counts.
7.
Navigate to Cal. Span (LoAd) and press
ENTER/TARE.
AUTO
Place a reference weight on the load cell, the LED
displays ADC count corresponding to the weight.
E.g., ‘6081’.
MANUAL:
User need to enter Known weight count
(without zero count) as span count.
 Press ENTER/TARE to set Cal. Span.
Cal. Span counts should be greater than
Cal. Zero + 50.
8.  Navigate to load Capacity (L-CAP) and press
ENTER/TARE.
 Enter the reference weight that is used while
calibrating Cal Span using up and left key. The
range should be (0.01 to Max Capacity). E.g.,
‘001.00’
 System asks to take calibration backup
(ConF?). If you want take backup then press
ENTER/TARE otherwise press MENU/ESC
thencome out from menu.
rSoL
2
CAL
-
0
1617
LoAd
6017
L
-
CAP
001.00

Contacts us : email : [e-mail] , Ph: 080-23481364
ANALOG SETUP
A
-
Lo
01092
This menu will help you to calibrate Analog output.To access Analog setup menu, navigate
to menu using up key and select A-Set and press ENTER/TARE.
S.No. Instruction Display
1.  Navigate to Analog output check (A-CHC) and
press ENTER/TARE.
 Here enter the weight value, and then it gives
the corresponding output.
2.  Navigate to Analog High (A-HI) and press
ENTER/TARE.
 The value which is going to send to DAC for
20mA has to be entered here.
 Range is (0 to 6553).
3.  Navigate to Analog Low (A-Lo) and press
ENTER/TARE.
 The value which is going to sent to DAC for 0
mA (or) 4 mA has to be entered here.
 If Analog selection is 0-20 (or) 0-10 then
The range is (0 to 6553).
 If Analog selection is 4-20 (or) 2-10 then
The range is (0 to 6553).
A
-
CHC
000.00
A
-
HI
05491

Contacts us : email : [e-mail] , Ph: 080-23481364
A
-
dEF
Lo
A
-
oFF
001.00
A
-
SPn
010.00
4.  Navigate to Analog Default Value (A-dEF) and
press ENTER/TARE.
 This provides safety to Analog Output during
error conditions. The user can select what
value of Analog Output should be during error
conditions.
The available modes are,
 Low Value (4 mA / 0 mA) -> ‘Lo’.

High Value (above 20 mA i.e.,22.05 mA)
-> ‘HI9H’.
 Value at Previous stage -> ‘LASt’.
5.  Navigate to Analog Offset (A-oFF) and press
ENTER/TARE.
 This provides the Analog Output starts range.
Here, user can set the positive or negative
offset.
 Before entering into “A-oFF” press left key to
Select positive (“pos”) or negative (“nEg”)
analog offset. “nEg”means –ve LED will be On.
The available modes are,
 If the offset is “pos” means then analog
output range starts from positive 001.00
kg to analog span value.
 If the offset is “nEg” means then analog
output range starts from negative 001.00
kg to analog span value.
6.  Navigate to Analog Span (A-Spn) and press
ENTER/TARE.
 This provides the Analog Output end range.
Here, user can set the weight at which can get
the max analog output.
 This menu is restricted to the max
capacity value under calibration.

Contacts us : email : [e-mail] , Ph: 080-23481364
SETUP
Adc
-
f
1
N
-
aUg
10
PASS
000
AUt
-
0
5
t
-
Ed
Enb
To access General setup menu, navigate to menu ->SETUP and press ENTER/TARE.
S.No Instruction Display
1.  Navigate to ADC Filter (adc-f) and press
ENTER/TARE.
 User can enter the filter value here with range of
(1-9). It is used to reduce fluctuations due to
sudden load impacts.
2.  Navigate to moving Average (m-avg) and press
ENTER/TARE.
User can enter the Moving average value here
with range of (1-100).
3.  Navigate to Password (PASS) and press
ENTER/TARE.
 Enter the password you want to use, using UP and
LEFT keys and press ENTER key to store &
activate it. This is three-digit password.
Default password is ‘000’.
4.  Navigate to Auto zero (Aut-0) and press
ENTER/TARE.
 The available Auto Zero value in engineering
count value is from 0 to 9.
 If we enter 5, when weight is Zero, if the current
weight deviation from 0 value in either positive or
negative is less than or equal to (5 * Resolution),
then the system will take the Current weight value
as 0. The 0 value disables the Auto Zero. Auto
Zero Function is used to avoid drift error.
5.  Navigate to Tare Enable/Disable (t-Ed) and press
ENTER/TARE.
 This is to enable or disable the tare when normal
process.

Contacts us : email : [e-mail] , Ph: 080-23481364
COMMUNICATION SETUP
d
-
Id
01
bAUd
9600
C
-
nod
n
-
bUS
OFFSE
00000
To access Serial communication setup menu, navigate to menu ->S-Conand press
ENTER/TARE.
S.No. Instruction Display
1.  Navigate to Device ID (d-Id) and press ENTER/TARE.
Enter the Device ID (1-99). It is required to identify the
system, in case of multiple systems are deployed.
2.  Navigate to Baud Rate (bAUd) and press
ENTER/TARE.
 It is used to set the communication between unit and
host device. It is settable between 2400, 4800, 9600,
19200, 38400, 57600, 115200bps.
3.  Navigate to Communication mode (C-nod) and press
ENTER/TARE.
 Available modes are,
o Request mode
o Dump mode
o ModBusRTU mode
o ModBus ASCII mode
 Refer Serial Communication protocol section.
4.  Navigate to OFFSET(OFFSE) and press
ENTER/TARE.
 User can enter the OFFSET value here with range of
(00000-49999).

Contacts us : email : [e-mail] , Ph: 080-23481364
SYSTEM CHECK (TEST)
r
-
AdC
1716
rECAL
ConF
?
L
-
dF
000
dIo
t
-
dIp
dis
-
c
88888
To access System check menu, navigate to menu -> tESt and press ENTER/TARE.
S.No. Instruction Display
1.  Navigate toRaw ADC (r-AdC) and press ENTER/TARE.
 Raw ADC counts corresponding to load cell is
displayed.
2.  Navigate to Restore Calibration (rECAL) and press
ENTER/TARE.
 On pressing ‘ENTER/TARE’ Key, system asks
confirmation. If ENTER key is pressed, Original
Calibration values are restored.
3.  Navigate to Load default (L-dF) and press
ENTER/TARE.
 It will ask the password to conform to load default. On
entering the correct password, system asks
confirmation. If ENTER key is pressed, System loads
the factory set defaults to Calibration, Analog setup,
Serial Communication setup and System check
Parameters and also in to the memory.
4.  Navigate to Display check (dis-c) and press
ENTER/TARE.
 The all LED will be ON at the same time, for checking
purpose.
5.  Navigate toDIO check (dIo) and press ENTER/TARE.
 Navigate to “t-doP” to test digital output.
Output can be checked by pressing Up key.
Navigate to “t-dIp” to test digital input.
t
-
dop

Contacts us : email : [e-mail] , Ph: 080-23481364
Serial Communication Protocol
The communication protocols used are a) Request mode b) Dump mode c) Modbus RTU mode d)
Modbus ASCII mode
Note: Modbus RTU mode implemented and tested with Simply modbus Software,
Modscan32,Modbus tester.
Communication settings:
Parity : None ; Data Bits: 8 ; Stop Bits: 1 ; Flow Control: None
Baud rate is settable under setup.
Request Mode:
If the Communication mode (C-nod), under setup is “rE9” then the below protocol will dump one
time based on the request from PC. Baud rate is settable under setup.
For Error condition weight value,
Over Range (OR)Weight value is 99999.
Over Capacity (OC)Weight value is 88888.
Under Range (UR)Weight value is 77777.
Dump Mode:
 If the Communication mode (C-nod), under setup is “dUmp” then the below protocol will dump
continuously (Same as request mode response). Baud rate is settable under setup.
%XX[YZWWWWW]$

Contacts us : email : [e-mail] , Ph: 080-23481364
Modbus ASCII Mode:
 If the Communication mode (C-nod), under setup is “n-ASC” then the below protocol will receive
based on request. All the parameters in the protocols should be in hex format.
 The Modbus ASCII mode having the same address of Modbus RTU.
FOR READ OPERATION:
For ASCII mode read operation protocol, the example format is given below,
Request: Eg - Request for Maximum Capacity: 010300030001F8
Start Char Device
Id
Read
Command Address No. of Registers LRC Stop Char
1 Byte
(:)
1 Byte
(01)
1 Byte
(03)
2 Bytes
(0003)
2 Bytes
(0001)
1 Byte
(F8)
1 Byte
(CRLF)
Response:
Start Char Device
Id
Read
Command
No. of Bytes to
send Data LRC Stop Char
1 Byte
(:)
1 Byte
(01)
1 Byte
(03)
1 Byte
(04)
2 Bytes
(07d0)
1 Byte
(e3)
1 Byte
(CRLF)
FOR WRITE OPERATION:
For ASCII mode write operation protocol, the example format is given below,
Request:
Start Char Device
Id
Read
Command Address Data LRC Stop Char
1 Byte
(:)
1 Byte
(01)
1 Byte
(06)
2 Byte
(0064)
2 Bytes
(0000)
1 Byte
(95)
1 Byte
(CRLF)
Response:
If the write operation is successfully done then the response will be same as that of request.
Modbus RTU Mode:
 If the Communication mode (C-nod), under setup is “n-rtu” then the below protocol will receive
based on request. All the parameters in the protocols should be in hex format. Baud rate is
settable under setup.
 Read operation can be performed for all address values and Write operation can be done only
for2,3,5,100,101,102,103,104,105,106,107,108,109,200,201,202,203,204,205,206,207,300,301.
Default the offset value is 00000.
In menu toselect485 setup menu ->to change the offset value.
The offset value 40000 means 40000 is Max Capacity address for read operation,
40000 is Max Capacity address for write operation.

Contacts us : email : [e-mail] , Ph: 080-23481364
S.NO ADDRESSES PARAMETER FUNCTION
1 0 RAW ADC (LSB OF RAW ADC) R
2 1 RAW ADC (MSB OF RAW ADC) R
3 2 PEAK VALUE (LSB OF PEAK VALUE) R
4 3 PEAK VALUE (MSB OF PEAK VALUE) R
5 4 STATUS R
6 5 TARE-CURRENT
WEIGHT
R-W(WRITE ‘0’TO TARE THE
WEIGHT )
7 6 CURRENT WEIGHT (LSB OF CURRENT WEIGHT) R
8 7 CURRENT WEIGHT (MSB OF CURRENT WEIGHT) R
S.NO ADDRESSES PARAMETER FUNCTION
1 100 MAX CAPACITY (LSB OF MAX CAPACITY) R-W
2 101 MAX CAPACITY (MSB OF MAX CAPACITY) R-W
3 102 DECIMAL POINT (0-3)R-W
4 103 RESOLUTION (1,2,5,10,20,50,100)R-W
5 104 CAL ZERO (LSB OF CAL ZERO) R-W
6 105 CAL ZERO (MSB OF CAL ZERO) R-W
7 106 CAL SPAN (LSB OF CAL SPAN) R-W
8 107 CAL SPAN (MSB OF CAL SPAN) R-W
9 108 CAL CAPACITY (LSB OF CAL CAPACITY) R-W
10 109 CAL CAPACITY (MSB OF CAL CAPACITY) R-W
S.NO ADDRESSES PARAMETER FUNCTION
1 200 ANALOG HIGH LSB R/W
2 201 ANALOG HIGH MSB R/W
3 202 ANALOG LOW LSB R/W
4 203 ANALOG LOW MSB R/W
5 204 ANALOG OFFSET LSB R/W
6 205 ANALOG OFFSET MSB R/W
7 206 ANALOG SPAN LSB R/W
8 207 ANALOG SPAN MSB R/W
S.NO ADDRESSES PARAMETER FUNCTION
1 300 ADC-FILTER R-W
2 301 MOV-AVG R-W
3 302 AUTO ZERO R
4 303 TARE EN/DI R
S.NO ADDRESSES PARAMETER FUNCTION

Contacts us : email : [e-mail] , Ph: 080-23481364
1 400 DEVICE ID R
2 401 BAUD RATE R
3 402 COM MODE R
4 403 OFFSET (LSB OF OFFSET) R
5 404 OFFSET (MSB OF OFFSET) R
FOR READ OPERATION:
Request: Example - Request for Resolution is 01 03 9C 41 00 01 D5CA
Device Id Read
Command
Address
No. of
Registers CRC
1 Byte
(01)
1 Byte
(03)
2 Bytes
(9C41)
2 Bytes
(0001)
2 Bytes
(D5CA)
Response: Example - Response for Resolution is 01 03 04 00 02D9 84
Each request and response will end with CRC values.
FOR WRITE OPERATION:
Request: Example - Request for write Cal-Capacity is 01069C 41 00 03 6E51
Response:
Response received is as same as that of request.
Device
Id
Read
Command
No. of Bytes
to send Data CRC
1 Byte
(01)
1 Byte
(03)
1 Byte
(02)
2 Bytes
(0002)
2 Byte
(D984)
Device Id
Write
Command Address Data CRC
1 Byte 1 Byte (06) 2 Bytes 2 Bytes 2 Byte

Contacts us : email : [e-mail] , Ph: 080-23481364
Troubleshooting
S. No
Problem
Reason
Solution
1.
No Display
Power line to the control unit
might be faulty.
Check the power cable
continuity.
2.
Weight
fluctuations
24 D
C.
Voltage
f
luctuations.
Check the Line Input Voltage.
Improper earth.
Check the
earth cable or
earth.
Load cell loose contact.
Check
c
able between
l
oad
cell &main PCB.
Over load
stopper touching
the
Load cell.
Avoid over loading or check
the Load cell.
Improper calibration
Re
–
c
alibration properly.
3.
Weight
Variation
Imp
roper
l
oad cell
connection
.
 Check the Load cell
mounting “ALLEN” Screws.
 Check whether any other
material is touching the
weigh platform.
 Check whether over load
stopper is touching the
Load cell.
4.
Communication
not working
 Improper wiring connection
 Loose contact
 Electrical damage
 Check the communication
cable.

Contacts us : email : [e-mail] , Ph: 080-23481364
Error Messages
S.No. Error
Code
Description
1. -oC-
If the value of current weight or displacement exceeds the
[Maximum load capacity or Maximum displacement value +
(9 * resolution)], then “OC” is displayed.
2.
oPEn
If the value of load cell exceeds its range or if the load cell
disconnected, “or” is displayed.
Or
If the value of load cell under ranged, “ur” is displayed.
3. PASEr If the entered password was wrong then this error message
will display. Please enter the correct password.
4.
U-Err
If the entered value exceeds the limit then this error
message will display. Please enter the correct value.
5. S-Err If the entered cal span is not more than the cal zero + 50
value then the system will display this error message.
6. C-Err If calibration back not taken then this error message will
display.
7. C-dIS Calibration menu access disabled.