General Measure GM8802F-2 User manual

GM8802F-2
USER’S MANUAL
GM8802F-02110201
48010221221000
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GM8802F-2 Field Mounting Transmitter
GM8802-F2110101 Ⅰ
©2011 ，Shenzhen General Measure Technology Co., Ltd reserve all
copyright.
Without permission from Shenzhen General Measure Technology Co., Ltd，
Any corporations or person must not copy, spread, record or translate into other
language by any forms.
Our company reserved the right to update user’s manual without additional
notice to customers by reason of update, so please visit our website or contact
with our service person to get update information.
Website：http://www.szgmt.com
Approved standard: GB/T 7724—2008
WARNING
POWER SUPPLY 24V DC !
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GM8802F-2 Field Mounting Transmitter
GM8802-F21101011
Table
1 General description........................................................................................2
1.1 System sketch map....................................................................................3
1.2 Specification...............................................................................................4
2 Wiring..............................................................................................................5
2.1 Installation..................................................................................................5
2.2 Power connection.......................................................................................6
2.3 Load cell connection...................................................................................6
2.4 Serial port connection.................................................................................7
3Theory instruction..........................................................................................8
3.1 Initialization.................................................................................................8
3.2 Collecting weighing data.............................................................................8
4 Parameter table...............................................................................................9
4.1 Calibration parameters...............................................................................9
4.2 Operation parameters.................................................................................9
5 Serial port communication..........................................................................10
5.1 Parameters...............................................................................................10
5.1.1 Configuring address...........................................................................10
5.1.2 Configuring communication parameters.............................................11
5.2Communication protocols........................................................................12
5.2.1 GM-SP1 protocol..............................................................................12
5.2.1.1 Parameters code table...................................................................13
5.2.1.2 Read operatioin..............................................................................14
5.2.1.3Write operation...............................................................................15
5.2.1.4Calibration.......................................................................................17
5.2.1.5Optional operation..........................................................................18
5.2.1.6Error message solution....................................................................19
5.2.2 Modbus communication.....................................................................20
5.2.2.1 Modbus address..............................................................................20
5.2.2.2 Modbus communication mode ........................................................24
5.2.2.3 Function code..................................................................................25
5.2.2.4 Error communication message........................................................30
6 Dimension.....................................................................................................31
6.1 Outline......................................................................................................31
6.2 Hanging mount and hole size...................................................................32
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1. General description
GM8802F-2 field mounting transmitters are an innovative value-adding solution for batching
and weight monitoring applications where many channels ofA/D are needed.
The instrument has multiple channels of independentA/D bundled flawlessly in an IP66 case,
allowing it to perform under the worst industrial environments and offering the best value for
the same high quality and advanced filtering.
For any application with outdoor settings, the control panel is considerable distance from the
site. So instead of being placed in the indoor control panel, The robust casing allows the
transmitter to be placed in the industrial site (close to loadcell), dramatically reducing the
amount of shielded analogue line needed and creating significant savings on the project’s
bottom-line.
Key Features:
CEApproved
IP65 casing allows performance in the worst industrial environment
Used in systems with PLC/PC
Powerful 32 bits ARM technology CPU makes it exceptional precise and responsive.
2 independent channels of A/D bundled flawlessly together
Patent pending two-layer advanced digital filtering algorithm
24 bit Sigma-DeltaA/D conversion with 8 Million counts internal resolution
Front panel mounting
Advanced power electronics power supply 18-36V DC
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1.1 System sketch map
A：Serial port terminals
B、C：load cell connection terminals（Channels 1-2 in turn）.
F：Status lights
POWER：Power supply；Light when power on.
AD1 ：Channel 1 AD state，sparkle for normal.
AD2：： Channel 2 AD state，sparkle for normal.
RXD：Receipt light；when receive a data string every time，the light sparkle one time.
Light or dark long time means no data string received.
TXD：Sending light；when send a data string every time，the light sparkle one time.
Light or dark long time means no data string sent.
G：Dip switch.
H：Programme on line for manufactory.
I：Serial port mode: RS232 or RS485 optional.
J：24V power supply input terminals；
K：24V power supply output terminals to connect external kit（such as our
GM8891 display）.
L：Land terminal.
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1.2 Specification
A/D CONVERTER
Type 24-bit Delta-Sigma
Analogue input range 0mV to 15mV
Linearity <0.001%FS
Gain Drifting 10PPM/℃
Minimum Sensitivity 0.2 µ V/d
Conversion Rate 120/s
DisplayAccuracy 1 / 50,000
CALIBRATION & WEIGHING FUNCTIONS
Calibration By test weight or by electronic calibration
Digital Filter Two Layer FIR filter with 9 selectable levels
Weighing Functions Zero, zero tracking
ENVIORNMENTAL
Operating Temperature -10℃to 40℃
Storage Temperature -25℃to 70℃
Relative Humidity 90% R.H without dew
IP Level IP 65
LOAD CELLS
Excitation 5V
Number of 350Ω Load Cells 8
MECHANICAL DATA
Dimensions & Weight 270×200×78 mm (L×W×H) weighs approx.1500g
Certification CE
Enclosure Cast aluminum body.
Modbus RTU/ASC II interface
Serial Interface RS485 1200-57600 baud, bus capability up to 31 units
Communication Mode Continuous or requested or Modbus RTU/ASCII
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2 Wiring
2.1 Installation
1. Tighten the screws on hanging mount 2. Loose the screws on transmitter.
in suitable place.
3. Fix the transmitter on hanging mount and tighten the screws.
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2.2 Power connection
GM8802F-2 Field Mounting Transmitter connects DC24V power supply as
follows:
Power supply connection
2.3 Load cell connection
GM8802F-4 Field Mounting Transmitter connects bridge type resistance strain gauge
load cells by 6 wires or 4 wires as follows:
Load cell terminals：
Terminal EX+ EX- SN+ SN- SIG+ SIG- GND
Connection Excitation+ Excitation- Sense+ Sense- Signal+ Signal- Shield
6 wires connection:
4 wires connection：
Note: 1. As load cell output sensitive analog signal, please use shield cable to separate
with other cables, especiallyAC power;
2. Please refer load cell instruction or contact its supplier for details.
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2.4 Serial port connection
GM8802F-2 Field Mounting Transmitter supply 1set of serial port（RS232/RS485
optional）to communicate with host computer as follows:
RS232 / RS485 serial ports
RS232 connection ：
RS485 connection：
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3 Theory instructions
3.1 Initialization
When power on, the POWER light is bright, and then other lights sparkle three times.
After testing lights, GM8802F-2 initializes all of parts.When finished, the related Adx（x
＝1，2）light is bright. If not light, the AD hasn’t finished initialization. Please restart again. If
still not light, it means the parts have been damaged. Special messages warn initialization
failed in reading weight by serial port communication.
Once AD finished initialization, GM8802F-2 begins to collect data after 2 seconds.
3.2 Collecting weighing data
Normal
Every AD collects weighing data respectively at high speed and related lights sparkle
fleetly，which means AD convert in normal state.
Problem
1）If the light is still not bright, message indicates the AD hasn’t finished initialization,
please restart again. If the problem is same, please check main board to see whether
there are burs on main board or not, clear them first and restart again. If always same
problem, maybe AD has been damaged, please change new one.
2）If the light is always bright, the AD has been forbided.
3) OFL（-OFL）：Indicate the weight is too heavy (or too light), then need unload (or add)
the weight. But if always OFL（-OFL）， please read present millivolt to see whether
overflow or not. If not, please calibrate again. If yes, please check load cell
connection or damaged.
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4 Parameter table
Parameters in every channel are same, but also can be set individually.
4.1 Calibrate parameters
Parameters Initial values Range
Unit 1 0
，
1
，
2
，
3
Decimal point 0 0
，
1
，
2
，
3
，
4
Minimum division 2 1
，
2
，
5
，
10
，
20
，
50
Maximum capacity 10000 ≤Mini division×50000
4.2 Operation parameters
Parameters Initial
values Range Description
Filter grade 4 0-9 0：none
9：strongest
Stability range 2d 1-9d If present weight change at
stability range in stability time, then
transmitter confirm the weight
value is stable.
Stability time 1.0S 0.1-1.0S
Zero-tracking
range
0d 0-9d If present weight is at zero-tracking
range in zero-tracking time, the
transmitter track zero, but not track
zero when Zero-tracking range is
0.
Zero-tracking
time 1.0S 0.5
，
1.0
，
1.5
，
2.0
Zeroing range 20% 1%-99% Percent of maximum capacity.
Anti-vibration
parameters 4 0-99 0 means no anti-vibration function
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5 Serial port communications
5.1 Parameters
Default address is 01；default parameters are：baud rate 38400、data format 1-7-E-1、
communication protocol GM-SP1.
When user connects more GM8802F-2 by RS485 communication, user should configure
different address at first, but for RS232 communication, no need define, use default address
01.
When default parameters can’t meet requirement, user should configure serial port
communication parameters.
Please refer 5.1.1 and 5.1.2 to configure address and parameters by dip switches:
5.1.1 Configuring address
GM8802F-4 have six dip switches（D1-D6）， which near digital number define 0 and near
“ON”define 1. D1-D5 configure address as following table：
D1 D2 D3 D4 D5 Address
0 0 0 0 0 01
0 0 0 0 1 02
0 0 0 1 0 03
….. ….. ….. ….. ….. …..
1 1 1 1 1 32
Address arithmetic：Convert binary system related present dip switch digits to
decimal system, and then add 1 to get address.
For example，convert present 0110（binary system）13
（decimal system）, and then the address is：13+1=14
Note：User need restart power after configuring address by dip switchs.
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5.1.2 Configuring parameters
Please dial dip switch D6 from 0（normal）to 1（defining）
to configure parameters as left drawing.
Note：User need restart power after dip switch D6 changed.
After that, user can define parameters, such as baud rate, data format, communication
protocols and so on；when finished, user need dial dip switch D6 to 0（normal）and restart
power, so GM8802F-2 begin to communicate data with host computer by update parameters.
Define parameters as following fixed protocol:
Data format：7bits，1 bit stop，Even（7-E-1）
Baud rate：38400
Code：ASCII
Command：
STX Address U S E T DATA1 DATA2 DATA3 DATA4 CRC CR LF
Response:
STX Address U S E T O K CRC CR LF
Here:
STX —— 1bit，start character 02H
Address —— 2bit，range from 01~16（30H 31H~31H 36H）
U —— 1bit，55H
S —— 1 bit，53H
E —— 1 bit，45H
T —— 1 bit，54H
DATA1 —— 1 bit，baud rate：30H：9600；31H：19200H；32H：38400；33H：57600
DATA2 —— 1 bit，communication mode：30H：MODBUS RTU；31H:MODBUS ASCI；
32H：GM-SP1
DATA3 —— 1 bit，data format
Data format table：
Communication mode DATA3 Data format
MODBUS-RTU
30H 8-E-1
31H 8-O-1
32H 8-N-1
33H 8-N-2
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MODBUS-ASCII
30H 7-E-1
31H 7-O-1
32H 7-N-2
33H Reserve
GM-SP1
30H 7-E-1
31H 7-O-1
32H 7-N-2
33H 8-N-1
DATA4 —— 1bit，high and low byte mode by MODBUS protocol：30H：high byte in the
front；31H：low byte in the front. But for GM-SP1 protocol，both of 30H and
31H are available
O —— 1 bit，4FH
K —— 1 bit，4BH
CRC —— 2 bit，
CRC calculate：Add all of front digits and convert to decimal system, then take the last two
digits to convert to ASCII（tens digit in the front and unit's digit at back）.
For example：
Checksum
Case 1：Define address 01 parameters：baud rate 38400、ModbusASCII、data format
7-E-1、high byte in the front.
Command：02 30 31 55 53 45 54 32 31 30 30 31 35 0D 0A
Response:02 30 31 55 53 45 54 4F 4B 37 34 0D 0A
Case 2：Define address 01 parameters：baud rate 57600、Modbus RTU、data format 8-E-1、
low byte in the front.
Command：02 30 31 55 53 45 54 33 30 30 31 31 36 0D 0A
Response: 02 30 31 55 53 45 54 4F 4B 37 34 0D 0A
Case 3：Define address 01 parameters：baud rate 9600、GM-SP1、data format 7-O-1。
Command：02 30 31 55 53 45 54 30 32 31 30 31 35 0D 0A
Response: 02 30 31 55 53 45 54 4F 4B 37 34 0D 0A
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5.2 Communication protocols
GM8802F-4 support thress protocols: GM-SP1，Modbus RTU and ASCII.
5.2.1 GM-SP1 protocol
Data format：7bits，1bit stop，even（7-E-1）
7 bits，1 bit stop，odd（7-O-1）
7 bits，2 bit stop，none（7-N-2）
8 bits，1 bit stop，none（8-N-1）
Baud rate：9600、19200、38400、57600（optional）
Code：ASCII
Operation code：W，write；R，read；C，calibration；O，Option.
CRC check sum：Add all of front digits and convert to decimal system, then take the last two
bits to convert to ASCII（tens digit in the front and unit's digit at back）.
5.2.1.1 Parameters code table
Code Parameter
code Parameters Description
R/W FL Digital filter 1bit：0
～
9in ASCII
R/W MR Stability range 1bit：1
～
9in ASCII
R/W MT Stability time 2bits：01
～
10 inASCII
R/W TR Zero-tracking
range 1bit：0
～
9in ASCII
R/W TT Zero-tracking
time 2bits：05
、
10
、
15
、
20 in ASCII
R/W ZR Zeroing range 2bits：01
～
99 in ASCII
R/W UN Unit 1bit：0
～
3in ASCII
R/W PT Decimal digits 1bit：0
～
4in ASCII
R/W VC Anti-vibration
rate 2bits：0~99 in ASCII
R DD Minimum division 2bits：01/02/05/10/20/50 in ASCII
R CP Maximum
capacity 6bits：000000
～
999999 in ASCII
R AM Absolute millivolt
7bits：D6D5D4D3D2D1D0
D6：+
D5-D0:6digits millivolt value in ASCII，fixed 4
decimal digits
R RM Zero-relatived
millivolt 7bits：D6D5D4D3D2D1D0
D6：+/-
D5 D0 6di it illi lt i ASCII fi d 4
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R VR Transmitter mode Return transmitter mode：02F2
（
The
channel no. must be A
）
C ZY Zero calibration
with weights
C ZN Zero calibration
without weights
C GY Gain calibration
with weights
C GN Gain calibration
without weights
O CZ Zeroing
operation
O EN/DI Start/shut AD
operation
O RB Restart system
operation The channel no. must be A
O RS Reset operation The channel no. must be A
5.2.1.2 Read operation
1. Read state and weight from single channel
Read command：
STX Address Channel no. R W T CRC CR LF
Correct response：
STX Address Channel no. R W T State Weight CRC CR LF
Here：
STX —— 1bit，start character：02H
Address —— 2bits，range from 01~16（30H 31H~31H 36H）
Channel no. —— 1bit，31H：channel no.1；32H：channel no.2
R —— 1bit，52H
W —— 1bit，57H
State —— 2bits
High
byte
Low byte
Fixed
40H
D7
D6
D5
D4
D3
D2
D1
D0
None Fixed
1 0：AD shut 1：AD start
0
：
AD
normal
1：AD
error
0
：
positive
1：
minus
0：
nonzero
1：zero
0
：
normal
1：
overflow
0：
unstable
1：stable
Weight —— 6bits，not including sign. Return“space space O F L space” when weight
overflow；Return“space space E R R space” when AD error；Return “space space
O F F space”whenAD shut.
CRC —— 2bits，check sum
CL —— 1bit，carriage return：0DH
LF —— 1bit，line feed：0AH
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For example
Read command from address 01 in channel no. 1：02 30 31 31 52 57 54 30 31 0D 0A
Correct response: 02 30 31 31 52 57 54 40 61 30 30 30 31 33 32 35 36 0D 0A
Means：AD start、normal、positive weight、nonzero、stable；weight：132
2）Read state and weight from all of channels
Read command：
STX Address A R W T CRC CR LF
Correct response：
STX Address Channel no. R W T Channel no.1~2
state and weight CRC CR LF
Here：
A —— 1bit，41H
Channel no.1~2 state and weight —— 2×8bits，2bits state and 6bits weightfor every
channels. Please see signal channel instruction.
For example:
Read command from address 01 in all of channels：
Read command：02 30 31 41 52 57 54 31 37 0D 0A
Correct response：02 30 31 41 52 57 54 40 61 30 30 30 32 33 30 40 63 20 20 4F 46 4C 20
30 33 35 34 0D 0A
Means：
Channel no.1：AD start, normal, positive weight, nonzero, stable；weight：230
Channel no.2：AD start, normal, positive weight, overflow, nonzero, stable；weight：OFL
3）Read other parameters
The data format of read command and response are same. Please see parameter table to
read and write.
Read command：
STX Address Channel no. R Parameter code CRC CR LF
Correct response：
STX Address Channel no. R Parameter code Value CRC CR LF
Here：
Parameter code —— 2bits，please refer Character 5.2.1.1 “Parameters code table”.
Value —— please refer Character 4“Parameter table”.
For example:
Read stable range from address 01 in Channel no. 1：
Read command：02 30 31 31 52 4D 52 38 39 0D 0A
Correct response: 02 30 31 31 52 4D 52 35 34 32 0D 0A
Means: present stable range in Channel no. 1：5
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5.2.1.3 Write operation
1）Write maximum capacity and minimum division
Read command：
STX Address Channel no. W D C Mini
division Max capacity CRC CR LF
Correct response：
STX Address Channel no. W D C O K CRC CR LF
Here：
W—— 1bit，57H
D—— 1 bit，44H
C—— 1 bit，43H
Minimum division —— 2 bits，write value: 01/02/05/10/20/50（30H 31H~35H 30H）
Maximum capacity —— 6 bits，write value
O—— 1 bit，4FH
K—— 1 bit，4BH
For example：
Define minimum division and maximum capacity of address 01 in channel no.1: 5 and 10000.
Write command：02 30 31 31 57 44 43 30 35 30 31 30 30 30 30 36 30 0D 0A
Correct response: 02 30 31 31 57 44 43 4F 4B 32 34 0D 0A
2）Write other parameters
The data format of read command and response are same. Please see parameter table to
read and write.
Write command：
STX Address Channel no. W Parameter code Value CRC CR LF
Correct response：
STX Address Channel no. W Parameter code O K CRC CR LF
Here：
Parameter code —— 2bits，please refer Character 5.2.1.1 “Parameters code table”
Value —— please refer Character 4“Parameter table”.
For example:
Define zeroing range of address 01 in channel no. 1：50.
Write command：02 30 31 31 57 5A 52 35 30 30 38 0D 0A
Correct response: 02 30 31 31 57 5A 52 4F 4B 36 31 0D 0A
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5.2.1.4 Calibration
1）Zero calibration with weights
Note: Write command to calibrate zero when system is stable.
Calibration command：
STX Address Channel no. C Z Y CRC CR LF
Correct response：
STX Address Channel no. C Z Y O K CRC CR LF
Here：
C—— 1bit，43H
Z—— 1bit，5AH
Y—— 1bit，59H
For example:
Calibrate zero on address 01 in channel no. 1:
Calibration command：02 30 31 31 43 5A 59 39 34 0D 0A
Correct response: 02 30 31 31 43 5A 59 4F 4B 34 38 0D 0A
2）Gain calibration with weights
Note：Write weight when load weight 80% of maximum capacity.
Calibration command：
STX Address Channel no. C G Y Weight CRC CR LF
Correct response：
STX Address Channel no. C G Y O K CRC CR LF
Here：
G —— 1bit，47H
Weight —— 6bits，present weight value
For example:
Gain calibration to address 01 in channel no. 1 after loading weight 80% of maximum
capacity.Command data format from host computer as follows：
02 30 31 31 43 47 59 30 30 30 32 30 30 36 35 0D 0A
Correct response: 02 30 31 31 43 47 59 4F 4B 32 39 0D 0A
Instruction for calibration with weights：
In zero and gain calibration with weights, please record zero millivolt, gain millivolt and
related weight in following list. If no weights to calibrate sometimes, user can calibrate
without weights as following values.
Times Zero millivolt
（
mV
）
Gain millivolt
（
mV
）
Weight
（
Kg
）
Date Memo
1
2
3
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