SevenStar D08-8C User manual

D08-8C、D08-8CM
Flow Accumulator
Instruction Manual
Version March，2020

D08-8C、D08-8CM Flow Accumulator revision：
Author
Date
Description
Revision
Zhao Di
05/12/2005
Initial version
1.01
Zhao Di
03/06/2006
This version can make the function that one
master(PC) communicates with 16
D08-8C/8CM Accumulators comes true.
1.02
Zhao Di
03/15/2010
The program in D08-8C/8CM were modified to
make it more stable;
The command of reading instantaneous flow
set point value was added in D08-8C
communication protocol. Please see Appendix
One for details.
2.01

A NOTE TO OUR CUSTOMERS
Dear customer,
Thank you for purchasing SEVENSTAR D08 series Flow Readout Boxes.
This user manual is important when installing and doing maintenance. Please keep it carefully.
We strongly recommend that you read this manual thoroughly before you starting to use the product. This user manual
introduces the important issues including the proper and safe use of the products.
And please notice the words and section with the symbol . Not in accordance with the user manual for the use of
property caused by loss or personal injury, SEVENSTAR may not be responsible.
If you require any additional information or assistant of Sevenstar D08 series Flow Readout Boxes. Please feel free to
contact your local Sevenstar Sales Agent or Sevenstar Customer Service at:
(8610)- 6436 2925.
Yours sincerely,
Sevenstar

CONTENTS
D08-8C for mass flow controller
D08-8CM for mass flow meter
1. APPLICATIONS.................................................
1
1. APPLICATIONS.....................................................
20
2. SPECIFICATIONS.............................................
1
2. SPECIFICATIONS.................................................
20
3. OPERATION PRINCIPLE..................................
2
3. OPERATION PRINCIPLE......................................
21
4. INSTALLATION & CONNECTION.....................
2
4. INSTALLATION & CONNECTION.........................
21
4.1 Dimension..........................................................
2
4.1 Dimension..............................................................
21
4.2 Tapping Installation Dimension..........................
3
4.2 Tapping Installation Dimension..............................
22
4.3 Installation Mode................................................
3
4.3 Installation type.....................................................
22
4.4 view of Accumulator............................................
3
4.4 view of Accumulator..............................................
22
4.5 Serial communication Connection......................
3
4.5 Serial communication Connection..........................
22
4.6 D Connection......................................................
4
4.6 D Connection........................................................
23
4.7 ~220V Power Connection...................................
5
4.7 ~220V Power Connection....................................
24
5. OPERATION INSTRUCTIONS...........................
5
5. OPERATION INSTRUCTIONS............................
24
5.1 Start Up..............................................................
5
5.1 Start Up................................................................
24
5.2 Initial State..........................................................
5
5.2 Initial State...........................................................
24
5.3 Button Definitions................................................
6
5.3 Button Definitions................................................
24
5.4 Menu Instructions...............................................
7
5.4 Menu Instructions................................................
25
5.5 Shut Down..........................................................
9
5.5 Shut Down...........................................................
27
6. EXAMPLE..........................................................
9
6. EXAMPLE...........................................................
27
7. CAUTION...........................................................
10
7. CAUTION............................................................
29
8. PRODUCTION SELECTION............................
11
8. PRODUCTION SELECTION..............................
29
APPENDIX One: COMMUNICATION PROTOCAL OF
8C ACCUMULATOR
13
APPENDIX Two: COMMUNICATION PROTOCAL OF
8CM ACCUMULATOR
31
D08 SERIES FLOW READOUT BOXES

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D08 SERIES FLOW READOUT BOXES
D08-8C Flow Accumulator
Operating Instruction
1. APPLICATION
D08-8C Flow Accumulator provides operating power supply, flow accumulating, instantaneous flow
rate and cumulate flow rate digital display of MFC/MFM. General speaking, D08-8C Flow
Accumulator is compatible with D07 series MFC & MFM, and it can also compatible with other MFCs.
2. SPECIFICATIONS
2.1 Output Power Supply (for MFC or MFM operation) …………......…+15V, 200 mA Voltage Difference: ±5%
-15V, 400 mA Voltage Difference: ±5%
2.2 Max Display Range…………………………………………………………........…999999 SL ( or 999999 Standard M3)
2.3 Flow Cumulated Error…………………………………………………………….…………………………………………< 0.3 %
2.4 Instantaneous Flow Display Distinguish ability…………………………….......…………………………………0.1% F.S
2.5 Standard Power Supply……………………………………….......…………+5.00V, 5mA Voltage Difference: ±0.1%
2.6 Supply Power…………………………………………………………....…………………………….~85-265V AC 50Hz/60Hz
2.7 Serial Communication interface…………………………………….......………………………………………RS232, RS485
2.8 Max power consumption…………………………………………………..……………………………………………………10W
2.9 Bypass Control……………………………………………………………..………………………1 Way MFC or 1 Way MFM
2.10 Dimension………………………………………………………………..……………………………………(72×72×168) mm
2.11 Weight……………………………………………………………………....................................................…………………0.5 kg

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3. OPERATION PRINCIPLE
D08-8C Accumulator is consisted of ±15V power supply, 5V power supply, modulus converter,
instantaneous flow & cumulated flow displayer, 6 keys and communication part. The flow test
voltage (0V~+5V) that came from MFC/MFM converts to digital signal after pass through A/D
converter to operate and cumulate processing in SCU( Single Chip Micyoco ). After that, the
instantaneous flow rate is delivered to four-place-LED displayer, the displaying units are SCCM
(Standard Milliliter/Min) or SLM (Standard Liter/Min); it also could be: SLM or KSLM (Standard
Kiloliter /Min, viz. Standard M3/Min). The cumulated value is delivered simultaneously to
6-place-LED displayer, the displaying units are SCC (Standard Milliliter) or SL (Standard Liter);
it also could be: SL or KSL (Standard Kiloliter, viz. M3).
The maximum cumulated flow could match to 999999 SL, if MFM unit is SCCM, the preliminary
cumulated flow unit is SCC, when cumulated value matched to 1000 SCC, the cumulated flow
unit will change to SL automatically. If cumulated value exceeds the maximum, the
arithmometer will reset automatically and begin accumulating from zero. If user used 100
SCCM MFM, the minimum cumulated time could match to 166666.67 hours(about 19 years).
Our Flow Accumulator is quite good at long-time continuous accumulation, circulate
accumulation, cumulated value radix point and unit automatic adjustment.
D08-8C Accumulator offers Serial Communication function, it can communicate with master(PC)
via Standard RS232 or RS485 Serial Communication Interface ( RS-232 and RS-485 is
switched by the slide switch S2 on circuit board). Please refer to the Chapter 4.5 for more
details of the serial communication. Please refer to appendix one for more details of the
communication protocol.
4. INSTALLATION & CONNECTION
4.1 Dimensions: It used standard plastic chassis, as showing in figure 1:

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Figure1. Dimensions of D08-8C
4.2 Installation Tapping Dimensions: ( 67×67 )mm
4.3 Installation Mode: Standard Inlay Installation
4.4 Front panel view(Figure 2) and rear panel view(Figure 3)
Figure2. Front panel view of D08-8C Figure3. Rear panel view of D08-8C
4.5 Seriel communication connection(Figure 4)

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Figure4. 9-pin Standard D-Sub socket
When you use one Master(PC) communicated with one D08-8C Accumulator, we commend RS232
communication mode; When you use one Master(PC) communicated with many D08-8C
Accumulators( the maximum is 16 ), we commend RS485 communication mode;
When you select RS232 communication mode:
Please connect pin 2(TXD) , pin 3(RXD) and pin 5(SG) showed in figure 4 to PC’s standard
RS232 serial port’s corresponding pin 2(RXD),pin 3(TXD) and pin 5(Signal COM);
When you select RS485 communication mode:
Please connect pin 6(A ＋) , pin 7(B －) showed in figure 4 to the Master(PC)’s standard
RS485 serial port’s corresponding pin(A ＋), pin(B －). In fact, this is the Half-Duplex RS485
Communication Mode, you should set every 8C Accumulator to the different address, the
Master(PC) can discern every 8C Accumulator by the different address, in this mode you can use
one Master(PC) communicate with 16 8C Accumulators (if you want know more about the
communication protocol, please read the Appendix One).
4.6 15 pin Standard D-Sub connection with MFC

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Figure 5. 15 pin Standard D-Sub connection with MFC
It can be directly connected with MFC through D-Sub by cable.
4.7 ~220V power connection is showed in figure 3. For the sake of safety GND must be connected.
5. OPERATION
5.1 Startup
There is no power switch of Flow Accumulator, it could be operated after external alternating
current connecting.
5.2 Initial State
“ Valve Drive ” is default when you connect external alternating current, the green “ Valve Drive ”
LBD will light at the same time. Full scale readout defaults to 100.0SCCM; communication address

Page 6of 34
defaults to 1, and cumulate flow unit defaults to SCC.
5.3 Keys Definitions
The D08-8C Accumulator is operated and configured by the six keys in the front panel, The keys’
meaning is shown below:
“SET “Key
This key is used to implementation functions under mentioned in 5.4, it has six submenus.
“OK” Key
This key let users enter the menu and save the value they have set.
“＋” Key
This key can increase the value of Full Scale, Flow Setpoint and Address, when you quickly press
this Key one time, the value will goes up “1”, when you press this key and continue several seconds,
the value will goes up continuously.
“－” Key
This key can diminish the value of Full Scale, Flow Setpoint and Address, when you quickly press
this Key one time, the value will goes down “1”, when you press this key and continue several
seconds, the value will goes down continuously.
“AUTO” Key
MFC’s valve defaults to “ Valve Drive ” when the power is connected. This key can make MFC’s
valve reset to “ Valve Drive ” state when MFC’s valve is in “OFF” or “PURGE” state.
“OFF” Key
This key is used to set MFC’s valve state to “OFF” state.

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5.4 The submenus
The D08-8C has six submenus. All the submenus can be accessed and displayed easily: you
can change from one submenu to another using the “＋/－” keys or return to the state of
displaying instantaneous flow value at any time by pressing the “SET” key.
Submenu1 : SET INSTANTANEOUS FLOW
To enter submenu1, press “SET” key and the display will read ”1”. Then you have four selections:
Press “＋” key to enter submenu 2, and the display will read “2” ;
Press “－” key to enter submenu 6, and the display will read “6”;
Press “SET” key again to return to the state of instantaneous flow display;
Press “OK” key to set the instantaneous flow. The setting sequence is as follows:
At fist the last digit of setpoint value will flash, you can increase or diminish the last digit value by the
“+ key” and “- key”, when the desired value is displayed, press the “OK key” and then the tens digit
will flash allowing being updated in the same way. So you can change the setpoint value from the
last digit to the first digit.
NOTICE
1 When the setpoint exceeds the Full Scale value, the setpoint value will automatically default to
the Full Scale value after the “OK key” is pressed.
2 To avoid zero drift value being added to the cumulate value, D08-8C Accumulator is designed
when the instantaneous flow value is less than or equal to one percent of the Full Scale value, this
instantaneous flow value will not be added to the cumulate flow value.
Submenu2: SET FULL SCALE
This submenu’s operation method is identical to submenu 1. The only difference is that when you
complete the first digit setting, the display value does not return to “2”, instead of that, the radix point

Page 8of 34
will flash, and you can change the radix point’s location by the “＋key”. After that, press “OK key” to
save the Full Scale value. At last, press “Set key” to return to the state of displaying instantaneous
flow.
NOTICE
The Full Scale’s radix point location will have a effect on the instantaneous flow, it means the Full
Scale and the instantaneous flow’s radix point have the same location.
Submenu3: SET UNIT
In this mode, the displayed reading is “3” indicating submenu 3. Press the OK key, it appears “31” in
the display; then use “＋/－” keys to make SLM LBD or SCCM LBD turns on or off. After that,
press “OK key” to save the unit. At last, press “Set key” to return to the state of displaying
instantaneous flow.
Submenu4: SET ADDRESS
This function of submenu is identical to submenu1, the range of address is 0~255.
NOTICE
When D08-8C accumulator communicate with PC, you should make sure that
accumulator’s address is match to the protocol data’s address sent by Master(PC). If not,
communication does not work. For the details, see 《The Communication Protocal of
D08-8C Flow Accumulator》below.
Submenu5: PURGE
When the displayed reading is “5”, press the “OK key” once, the display will read “51”; Press the “OK
key” again, AUTO LBD will turn off, and PURGE LBD will flash, the MFC’s valve will be set to the
“ Valve Purge ” state.
NOTICE

Page 9of 34
When MFC’s valve is in “ Purge ” state, the displayed reading will overflow and flash, indicating that
the instantaneous flow measured value is far greater than the Full Scale value.
Submenu6: CUMULATE FLOW RESET TO ZERO
When the displayed reading is “6”, press the “OK key” once, the display will read “61”; Press the “OK
key” again, the cumulate flow will reset to zero, and then will automatically return to the state of
instantaneous flow display( this process may take 1.5 seconds ).
5.5 SHUT DOWN
Disconnected AC power, the accumulator will turn off.
Cumulate flow value’s SAFEGUARD FUNCTION when power is off
The setpoint of instantaneous flow, Flow Full Scale and Units will be saved at the time of
power off. When the power on, these values will not be changed. Specially, the cumulate flow
value will be saved every 30 seconds, when the power on the cumulate flow matches to the
last saved value.
6. EXAMPLES
ONE: If you want to change the Full Scale value from 100.0SCCM to 2000SCCM, perform the
following steps:
1 Press the “SET key” once, “1” will appear on the display; increase it to “2” with the “＋key”;
2 Press the “OK key” to enter submenu2,unit digit “0” will flash;
3 Press the “OK key” three times, thousands digit “1” will flash, allowing being updated by
using “＋key” or “- key” ;
4 Increment it to “2” with the “＋key”;
5 Press the “OK key”, the current radix point location will be shown and flash;
6 Press the “＋key” three times, the radix point will extinguish;

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7 Press the “OK key” to save operation and return to submenu2, then depress the “SET key”
to
8 exit;
9 When you change the Full Scale, you should reset the cumulate flow value to zero, please
following the steps shown below:
Press the “SET key” once, “1” will appear on the display indicating submenu1 is entered;
Press the “－key” once to scroll the number, the display will read “6” indicating submenu6
is entered;
Press the “OK key” once, “61” will be displayed;
Press the “OK key” again and wait for 1.5 seconds, the accumujlated value will be set to
zero and exit.
TWO: If you attempt to change the unit from SCCM to SLM, follow the steps shown below:
1 Press the “SET key” once, “1” will appear on the display indicating submenu1 is entered;
then press the “＋key” twice to display “3”;
2 Press the “OK key” once to display “31”;
3 Press the “＋key” once, SCCM LBD will turn off and SLM LBD will turn on;
4 Press the “OK key” once to save and return to submenu3;
5 Press the “SET key” to exit;
6 Perform step 8 described in Example One.
7. CAUTION
7.1 When voltage signal of flow is negative, “-00.0” will be displayed.
7.2 When the MFC is in the state of “Valve control”, You can change MFC’s valve state to “OFF”
state by pressing the “OFF key”, in this situation, you can also enter the submenu 1 and

Page 11 of 34
change the instantaneous flow setpoint value, but when you complete the setpoint setting, the
new value will not take effect at once, because the MFC’s valve is still in the “OFF” state, you
must press the “AUTO key” making the MFC’s valve be changed to the “AUTO” state, and then
the new setpoint value will take effect.
7.3 D08-8C Flow Accumulator can also operate together with MFM, in this situation, the “Valve
control” and Setpoint didn’t work, it just tests instantaneous flow and displays instantaneous
flow and cumulate flow.
7.4 Reference appendix 1 for more information about communication protocol.
8. PRODUCTION SELECTION
8.1 Type selection
8.2 Order form
D08-[t] - [b] - [s]
Circuit
Cases
Display
Power supply
Output
voltage
Other funtions
Type
MFC
MFM
Ana.
Dig.
Mini
-Type
Desk
-style
Rack
-desk
-style
1
channel
1
Display
Multi-
Channel
1
Display
Multi-
Channel
Multi-
Display
~110
VAC
~220
VAC
~85
-265
VAC
±15
VDC
+24
VDC
4~20mA/
0~10mA
I input
4~20mA/
0~10mA
I output
4~20mA
/ 1~5V
Input
Signal
4~20mA
/ 1~5V
Output
Signal
RS232/
RS485
Commu-
nication
Setpoint
display
Flow
Accumu
-lator
1F
√
√
√
√
√
√
√
√
√
1FM
√
√
√
√
√
√
√
1FP
√
√
√
√
√
√
√
√
√
√
1/2/4
√
√
√
√
√
√
√
2F/3F/4F
√
√
√
√
√
√
√
√
2B/3B/4B
2E/3E/4E
√
√
√
√
√
√
√
1K
√
√
√
√
√
√
√
√
1~5V
1G
√
√
√
√
√
√
√
√
1GM
√
√
√
√
√
√
√
8C
√
√
√
√
√
√
√
√
√
8CM
√
√
√
√
√
√
√
√

Page 12 of 34
[t] – Type
8C
[c] – Communication type
-[2] RS232
-[4] RS485
[s] – Special request
-[-] percentage display(100.0),Chinese label.
-[S] List full scale(see table on right side) and other request.
APPENDIX 1
D08-8C COMMUNICATION PROTOCAL
Full scale
Code
5sccm
A
10sccm
B
20sccm
C
30sccm
D
50sccm
E
100sccm
F
200sccm
G
300sccm
H
500sccm
J
1slm
K
2slm
L
3slm
M
5slm
N
10slm
P
20slm
Q
30slm
R
50slm
U
100slm
V
150slm
W
200slm
X
250slm
Y
300slm
Z

Page 13 of 34
1 ： Summary
This protocol is applied to the communication between the Master(PC) and D08-8C Flow
Accumulator.
Data format: hexadecimal
Baud rate: 9600 b/s
Data bits: 8 bits
Stop bits: 1 bit
Check bits: none
2 ： DETAILED DATA FORMAT
2.1 Read flow accumulator’s current state
→Request message from the Master(PC) 8 bytes
01 03 00 02 00 08 E5 CC
which means:
01 Address of the device, here 1;
03 Reading command;
00 02 Address to read, here 0x0002;
00 08 Number of word to read: Here 8 words(16 bytes);
E5 CC CRC(calculated)
←Answer message from the Slave device
01 03 10(1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16) CRCL CRCH
which means:
01 Address of the device, here 1;
03 Reading command;
10 Number of bytes read, here 16 bytes;
(1)~(4) Instantaneous flow value;
The data “00~09” denotes corresponding number “0~9” ;
The data “10~19” denotes corresponding number “0.~9.”;

Page 14 of 34
“0F” denotes blank;
“0A” denotes “-” ;
“1A” denotes “-.” ;
Transferred sequence is from low digit to high digit;
For example: (1)~(4)=00 10 09 0F denotes the instantaneous flow is “90.0”;
(5)~(10) Cumulate flow value;
The Data definitions are the same as that of instantaneous flow value;
For example: (5)~(10)=05 13 04 02 0F 0F denotes the cumulate flow is “243.5”;
(11)~(14) Full Scale
The Data definitions are the same as that of instantaneous flow value;
For example: (11)~(14)=00 10 00 01 denotes the Full Scale is “100.0”;
(15) Units;
00 denotes SCCM and SCC(or SLM and SL);
01 denotes SCCM and SL(or SLM and KSL);
11 denotes SLM and SL(or KSLM and KSL);
(16) Valve state;
00 denotes “Valve OFF”; 80 denotes “Valve AUTO”; FF denotes “Valve PURGE”;
CRCL CRCH: CRC(calculated)
2.2 Read Instantaneous flow set point value
→Request message from the Master(PC) 8 bytes
01 03 01 0A 00 02 E5 F5
which means:
01 Address of the device, here 1;
03 Reading command;
01 0A Address to read, here 0x010A;
00 02 Number of word to read: Here 2 words(4 bytes);
E5 F5 CRC(calculated)

Page 15 of 34
←Answer message from the Slave device
01 03 04 (1) (2) (3) (4) CRCL CRCH
which means:
01 Address of the device, here 1;
03 Reading command;
04 Number of bytes read, here 4 bytes;
(1)~(4) Instantaneous flow set point value;
The data “00~09” denotes corresponding number “0~9” ;
The data “10~19” denotes corresponding number “0.~9.”;
Transferred sequence is from low digit to high digit;
For example: (1)~(4)=00 10 08 00 denotes the instantaneous set point flow is “80.0”;
CRCL CRCH: CRC(calculated)
2.3 Reset the cumulate flow value to zero
→Request message from the Master(PC) 8 bytes
01 05 00 18 00 FF 0D 8D
which means:
01 Address of the device, here 1;
05 Command number;
00 18 Starting address;
00 FF The meaning is Reset the cumulate flow value;
0D 8D CRC(calculated)
←Answer message from the Slave device
The answer is identical to the request.
2.4 Changing the Valve state
→Request message from the Master(PC) 8 bytes
01 06 00 16 00 00 68 0E “Valve OFF”

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01 06 00 16 00 80 69 AE “Valve Control”
01 06 00 16 00 FF 28 4E “Valve PURGE”
which means:
01 Address of the device, here 1
06 Command, here writing 1 word;
00 16 Starting address;
00 00 Valve OFF;
00 80 Valve Control;
00 FF Valve PURGE;
Last two bytes CRC(calculated)
←Answer message from the Slave device
The answer is identical to the request.
2.5 Set the setpoint value of instantaneous flow
→Request message from the Master(PC) 8 bytes
01 06 01 0A (1) (2) CRCL CRCH
which means:
01 Address of the device, here 1
06 Command, here writing 1 word;
01 0A Starting address;
(1) (2) Setpoint value in hex. (1) is the Hi byte, (2) is the Lo byte;
NOTICE
When you set the setpoint value, you shouldn’t be concerned about the location of radix point,
because the radix point’s location is identical to the Full Scale’s.
Examples
Data
Radix point location
Setpoint value