Benutzeranleitung / Produktwartung High Speed Load Cell Interface Card LCIC-WIM-BEN des Produzenten Omega Engineering
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2 Table of Contents 1. Introduction 1.1 General Description 1.2 Typical Applications 2. Installing the board in the PC 3. Utilities 3.1 Setup & Running 3.2 The Calibration Utility 3.2.1 General 3.2.2 The Calibrations Library 3.2.3 Parameters 3.2.4 Calibration Efficiency (CE) 3.
3 4. Programming your Application 4.1 Commands 4.2 Parameters 4.3 LCIC-WIM ActiveX 4.3.1 Start/Stop Communication 4.3.2 Variables 4.3.3 Filters 4.3.4 Fast Mode 4.
4 Appendices A. I/O & the LED Display A.1 General Notes about the I/O A.2 Connecting External Devices to the Inputs A.3 LCIC-WIM I/O & Analog Out A.4 The LED Display B. Scaling the Load Cell Input C. Load Cell Connections D. USB, RS232 & RS485 D.
5 F.7 Dimensions (mm) F.8 Misc. G. Trouble-shooting G.1 Card does not respond after PC power-on H. Zero & Tare H.1 The Zero function H.2 The Auto-Tare function.
6 1. Introduction 1.1 General Description The model LCIC-WIM is a very High Speed, Intelligent Load Cell Interface Card with USB/RS232/RS485. Besides its basic mode – named below as the general mode – the board includes an integral Fill Mode supplying an independent filling control.
7 2. Installing the board in the PC (The following description refers to Windows XP. Obviously, on another operating system it might be different.) 1. Make sure that all installation files have been copied to your hard disk to a new folder, say, LCIC-WIM.
8 4. Select the second option, click ‘Next’ and browse to the “FTDI - VCP (Virtual COM Port) Driver” folder (under the folder where you copied the installation files in step 1).
9 5. After a while, you’ll have this display: Click ‘Finish’. Notes 1. It might occur that the wizard will return to step 3, requiring to repeat the process.
10 3. Utilities 3.1 Setup & Running 1. Run the setup(s) of the LCIC-WIM utilities in the folders: * LCIC-WIM-CALIBRATION * LCIC-WIM-SETTINGS 2. Run a utility: * If the utility reports that .Net Framework is not installed, then run "dotnetfxV1.
11 3.2 The Calibration Utility 3.2.1 General The calibration utility (LCIC-WIM-CALIBRATION) enables to calibrate the LCIC-WIM board adjusting it to your own system. The utility is straightforward and is in the form of a Windows wizard. It includes three main stages carried out in five steps.
12 The five calibration steps are: Step 1 – Show Data This step introduces both the parameters and the current readings , as received from the board. The step is passive in the sense that it only shows data passed by the board, but it does not make any change in the board.
13 Step 2 – Pseudo Calibration / Parameters This step starts the calibration procedure. It enables to change calibration parameters. Whether you changed the parameters or not, you may proceed to the next step by pressing the ‘Next’ button. Library issues: 1.
14 Step 3 – Pseudo Calibration / Zero This step enables to redefine the ‘zero’ level. Click ‘Skip’ if you are satisfied with the previous definition of the ‘zero’ level. Otherwise, when the scale is empty and stable (see note), click ‘Zero’ to sample another ‘zero’ level.
15 Step 4 – Pseudo Calibration / Weight This step enables to redefine the ‘weight’ level. Click ‘Skip’ if the previous ‘weight’ level was OK. Even if there was a fixed shift in the weight (which you probably corrected in step 3), you don’t have to redefine the ‘weight’ level – just click ‘Skip’.
16 Step 5 – Save or Quit This is the final step – here you decide whether to confirm the pseudo calibration, or leave it out. Before you decide, you may watch the current readings examining whether they are satisfactory.
17 3.2.2 The Calibrations Library Each calibration that the user applies may be saved in the ‘Calibrations Library’. Later on, the user may use that library as a short cut in order to restore a previous calibration quickly and reliably.
18 3.2.3 Parameters T T T h h h i i i s s s s s s e e e c c c t t t i i i o o o n n n d d d e e e s s s c c c r r r i i i b b b e e e s s s t t t h h h e e e p p p a a a r r r a a a m m m e e e t t t .
19 3.2.4 Calibration Efficiency (CE) The potential range of A/D points is between 0 and near ±8,400,000. The 'Calibration Efficiency' specifies what portion of this potential range is in use. The closer it is to 100%, the better accuracy / stability you have.
20 3.3 The Settings Utility The LCIC-WIM-SETTINGS utility gives control to card’s filters, analog output, fill mode parameters and more. The utility has three items: • The Menu Bar • Current Weight Display • Parameters The ‘Current Weight Display’ is rather obvious – it continuously shows the actual weight.
21 * The rate of updating the analog output is depends on the Update Frequency parameter. For example, when Update Frequency is 4, the analog output is updated 4 times a second. 3.3.1.1 Tools / Analog Output The ‘Settings’ utility gives access to the analog output mechanism: Click ‘Tools’ / ‘Analog Output’.
22 3.3.1.2 Tools / Baud Rate for SCI port Click ‘Tools’ / ‘Baud Rate for SCI port’ to see the current baud rate for the RS232/RS485 serial port. It may be changed to some values between 19,200 and 115,200. (The baud rate for the USB need not be defined – usually it is 921,600.
23 3.3.1.3 Tools / General Setpoints The LCIC-WIM board has four digital outputs. Each of them may be defined – through the Tools / General Setpoints – either as a manual output, or as a general setpoint output: • A manual output is controlled by a user’s command sent from the PC (or another computer).
24 3.3.2 Parameters The following sections describe the various parameters. After changing parameter(s), click the ‘Save to Board’ button and wait a while until the new value(s) are accepted by the board. 3.3.2.1 Communication The Communication box refers to card’s communication port – either serial or USB.
25 3.3.2.1.4 Get results immediately Controls card’s response in communication during a special mode, such as the Fill mode: When checked, the card assumes that the PC (or another remote computer) is continuously connected and listening to the communication port.
26 3.3.2.2 Auto Zero The ‘Auto Zero’ optional feature supplies an automatic correction to creeps in the zero level during a special mode (such as the fill-mode or the WIM-mode), caused by dust, temperature etc.
27 3.3.2.3 Start Fill-mode 3.3.2.3.1 Fill-mode starts automatically upon card reset When this option is activated (checked), the card starts automatically the Fill-mode upon reset. Otherwise (the option is unchecked), the cards ‘awakes’ in the upper level, referred to in this document as the ‘general mode’.
28 3.3.2.4 Filtering Board’s digital filtering is used to "smooth" the read samplings by averaging a pre-set number of the internal readings. It's especially essential on a noisy environment, as this mechanism reduces system's susceptibility to short interferences.
29 4. Programming your Application The control of the board is by commands and parameters , described below. You may either use them directly (see also section D.3), or call an ActiveX (see section 4.3) that does the work. 4.1 Commands _ <c/r> signifies a carriage return.
30 c. Get a single reading of: weight, A/D or temperature: . Get weight (after Filter2, not rounded to resolution). ? Get weight (after Filter2, rounded to resolution). > Get A/D reading after Filter1. < Get A/D reading after Filter2. T Get temperature d.
31 h. RS485: Address selection, setting & reading (for more details and examples refer to section D.5; except ‘ N x <c/r> ’, these commands are available also in the fill mode): : x <c/r> Activate the board addressed x . x is between 1 and 64.
32 i. Misc.: z (lower case z) Manually zero the gross weight. The effect of this function is temporary — it expires upon card reset. Response (versions 1.12, 3.09, 6.01, 7.00 and up): ‘z’<c/r>. Z (Upper case Z) (versions 1.12, 3.09, 6.01, 7.
33 Summary of Weight & A/D Reading Commands Reading Type Filtering Level Weight A/D Rounded to Resolution Not Rounded Filter1 Filter2 . v v ? v v > v v Single Reading < v v u v v Fast Mode U.
34 4.2 Parameters Parameter number Parameter Description Data Type 1 Load Cell mV/V (1, 2 or 3. 0 = unknown). Float 2 Units: 0=g, 1=kg, 2=ton, 3=oz, 4=lb. Float 3 Full Load Cell(s) Capacity Float 4 Maximum Applied Capacity Float 5 Resolution Index (0-17) Resolution Index is actually the index to an array of 18 defined values(0-17) like that: 0.
35 23 Filter1 value: 2-256. Becomes effective only after a system reset (either power off/on or using the ‘S’ command). Float 24 Filter2 value: 2-256. Becomes effective only after a system reset (either power off/on or using the ‘S’ command). Float 25 Decimator: 1-1000 .
36 1024-1034 Calibration Name (32 characters max.) (Organised 3 characters per location; in case the length is less than 32, the last character is followed by a binary zero byte.
37 4.3 LCIC-WIM ActiveX Unless otherwise specified, a function returns a Boolean: True for success, or False for failure. 4.3.1 Start/Stop Communication Is_LCIC_WIM_Port( CommPortNumber ) Returns: 0 if the port does not respond. 1 if the port responds but not as an LCIC-WIM.
38 4.3.2 Variables The system has variables with which the user may adjust the system to his needs and communicate with the I/O. Actually these variables consist of parameters, inputs and outputs. A variable may be read and sometimes also may be written.
39 Variables Table Category Variable Name Description Get Set Calibration_Name Name of calibration V Calibration_Date Calibration date (MMDDYY). V Calibration_Time Calibration time (HHMM, e.g., 1545). V Unit Weighing unit: ton, kg, g, lb or oz. V Resolution Weighing resolution: 0.
40 Variables Table (cont’d) Category Variable Name Description Get Set Weight_Native Current weight after Filter2, not rounded. V Weight_Rounded Current weight after Filter2, rounded to resolution. V A2D_F1 Current A/D after Filter1. V A2D_F2 Current A/D after Filter2.
41 Variables Table (cont’d) Category Variable Name Description Get Set Analog_Output_M ode 0 = Manual, 1 = Auto. V V Analog_Output_ Level Voltage in the analog output, in volts (0 – 2.5). * The ‘Set’ is relevant only if Analog_Output_Mode is ‘Manual’.
42 Variables Table (cont’d) Category Variable Name Description Get Set Fast Mode FM_Updates FM_Updates = Each how many internal updates there will be a Fast Mode transmission (3 – 52,734, integer). The frequency of the internal updates is 52,734 Hz.
43 4.3.3 Filters Set_Filtering( Filter1 , Filter2 , Decimator ) Filter1 (Integer): 2 – 256 or 0. Filter2 (Integer): 2 – 256 or 0. Decimator (long): 1 – 1000 or 0.
44 4.3.4 Fast Mode (The Fast Mode is not available with RS485.) During the Fast Mode there is auto high speed transmission of weight readings to the communication. About the transmission rate, refer to the ‘Fast Mode’ square in the variables table above.
45 The mechanism to receive the data uses events and methods as described below: The transmission sends blocks of information. Stage 1 Except the last one, each block generates the event DataArrivalInFastMode . When the event occurs, run the method Get_CurrentBlock to read the current block.
46 How to work with the Fast Mode in VB using the ActiveX During the Fast Mode process the board transmits mass data to the PC. Therefore, in order to avoid data loss, all the actions on your PC should be minimized. 1. Define string Array Dim Fast_mode_Data(1 to SizeOfArray) as String Dim fmCounter as long 'Current counter (index( 2.
47 Interpreting the data in a block : Each block includes integer weight values separated by a c/r. In order to get the real weight values, the integer values should be multiplied by the current Resolution Factor (for details refer to the end of stage 3, above).
48 Appendix A: I/O & the LED Display A.1 General Notes about the I/O * The digital I/O is available on CONN6 (15 pin Dsub). * Digital Outputs The outputs are opto-isolated 300mA 50V solid state relays. When activated (status LED is on), they switch the OUTPUT x (x=1,2,3, or 4) to I/O VOLTAGE OV.
49 * Connections The following table shows the I/O pinout: Pin Function 1 Output 1 2 Output 2 3 Output 3 4 Output 4 5 Input 1 6 Input 2 7 Input 3 8 Input 4 9 I/O Voltage 0V 10 NC 11 NC 12 Analog Out S.
50 A.2 Connecting External Devices to the Inputs.
51 A.3 LCIC-WIM I/O & Analog Out.
52 A.4 The LED Display Upon board restart , the two following messages are shown on the LED display – each for a while: LCIC x.xx x.xx is board’s DSP version. Sb yyy yyy is current board’s Serial baud-rate (refer to sections 3.3.1.2 & D.2). Then the display shows the current data.
53 Appendix B: Scaling the Load Cell Input The full scale of the input coming from the load cell may be adjusted by the LK4 jumper (which is next to load cell connector): • Across the two leftmost pins (default): Load cell output is 1-2mV/V. • Across the two rightmost pins: Load cell output is 3mV/V.
54 Appendix C: Load Cell Connections.
55 Appendix D: USB, RS232 & RS485 In addition to USB, The LCIC has an option for both full-duplex RS232 and half-duplex RS485 interfaces. These are brought out on CONN3, a 9 way ‘D’ type connector. The pin-out is as follows: CONN3 PIN FUNCTION 1 RS485- 2 RS232 TX (out) 3 RS232 RX (in) 4 NC 5 SIGNAL GROUND 6 RS485+ 7 NC 8 NC 9 NC i.
5 6 D.2 Baud Rate For the USB , the maximal baud rate is 921,600. The board responds well without a need to pre-define the used b/r. For serial communication , the required b/r should be pre-defined by the user via the Settings utility (section 3.3). The available baud rates are between 19,200 and 115,200.
57 D.5 RS485 Up to 64 LCIC-WIM boards may be connected to one PC port. In the PC side , use a converter either from the RS232 port, or from the USB port (that is, RS232 to RS485 converter, or USB to RS485 converter). In the board side , use the serial port (CONN3) – refer to the table in the beginning of this appendix.
58 RS485 Commands Except ‘ N x <c/r> ’ (paragraph d), these commands are available also in the fill mode. a. Activate address x ( x =1, 2, 3, …, 62, 63, 64): : x <c/r> Board(s) response: 1. If address x is already active : ! x <c/r> (The board reports that it is already active and has nothing to do.
59 Notes 1. Wait 10 ms after sending the colon (‘:’) before sending the rest of the command (‘ x <c/r>’). 2. Wait 30 ms after sending the ‘: x <c/r>’ command before analyzing the response(s). 3. There might be four cases with the conditions of 2.
60 b. Hello: :999<c/r> The ‘hello’ command is like a ‘who is alive?’ question. This is useful in order to detect which addresses exist in the system. Each existing board, whether active or not, responds ‘* x <c/r>’, where x is its address.
61 c. Read the RS485 address of the active board: n Board’s response: ’# x <c/r>’, where x is the address of the active board. x =0 means that the board has been configured as a non-RS485 device. Other value (between 1 & 64) specifies the RS485 address of the active board.
62 RS485 Responses (Most responses are already described in the ‘Commands’ section.) ! x <c/r> Address x is already active. See Commands/a/1. ^ x <c/r> Becoming inactive on behalf of address x . See Commands/a/2.1. A x <c/r> Address x becomes active.
63 Examples Suppose there are 3 boards in the system, addressed 1, 2 & 3. (The blue text is the PC side, the red text is the response from the board(s), and the black text is our comments) Example #1: Everything goes fine :999 *1 *2 *3 n (no response as no board is active) :1 A1 Board #1 becomes active n #1 :2 ^2 Responded by board #1.
64 So far everything was smooth; however, the quality of the communication depends – besides the board and the PC – also on the environment. Hence, there might be irregular situations that the user should know to handle – this is what the following two examples (#2 and #3) explain.
65 Example #3: No response from the old board n #1 :2 A2 Board #2 becomes active But the ‘^2’ response, telling that board #1 became inactive, did not arrive! Where is the disorder? Maybe board #1.
66 Board selection by the supplied utilities The three supplied utilities – LCIC-WIM-CALIBRATION, LCIC-WIM- SETTINGS & LCIC-WIM-MONITOR – enable easy selection of the required board: • Upon program start, all detected addresses are reported.
67 Appendix E: Fill Mode E.1 Introduction The LCIC-WIM supplies a Fill Mode in which it may control a filling operation, using the hardware inputs (section E.2) and hardware outputs (section E.3). The character of the filling operation is determined by parameters (section E.
68 E.2 Hardware Inputs Input #1 Input #2 Input #3 Input #4 OFF = Manual ON = Turn output #1 on ON = Turn output #2 on N/A When in error status: ON = Terminate an Error Status ON = Auto ON = Start When.
69 E.3 Hardware Outputs Output #1 Output #2 Output #3 Output #4 Option #1 Fast Valve Slow Valve Option #2 Fast Valve = Output #1 + Output #2 Slow Valve = Output #2 only Error Filling Complete (Only with board firmware 1.11 or higher.) (About Options #1 and Option #2 refer to ‘Fast Speed Config’ in section E.
70 E.4 Filling Parameters Notes 1. There is a set of three setpoints. Once they are specified (using the Settings utility), the user may switch to another setpoint without needing a PC . This gives more flexibility when several setpoints are needed. For details about the switching procedure refer to section E.
71 Auto Correction & Averaging x last fillings When ‘Auto Correction’ is checked, the board tries to correct the filling amount, based on the results of the last x fillings. E.4.1.2 Auto Tare Activate • When not checked , the Setpoint defines the requested final gross weight .
72 E.4.1.3 Valid Results Limits The resulting filling weight should normally be inside a user pre-defined ‘valid range’. In case the weight exceeds that range, an error situation will occur. Specify ‘Valid Limits (±)’= 0 if you don’t need this check.
73 E.4.1.4 Stabilization Criterion (Tare & Stop) At the beginning and at the end of a filling cycle the board waits for the scale to stabilize in order to read its weight.
74 E.4.2 Filling By = Time E.4.2.1 Filling by Time Parameters Setpoint # x The required total filling time when the user selects setpoint # x ( x = 1, 2 or 3). Slow Amount The required slow filling time, in % of the current Setpoint (a tip shows the value of Slow Amount in ms).
75 E.4.4 The Filling Configurations Library There is a ‘Filling Configurations Library’ in which you may save sets of filling configuration parameters. This is useful in case you have more than one type of filling, letting you switch easily and reliably from one configuration to another.
76 E.5 LED Display Notations In Fill-mode , the LED display shows the current sub-mode: m Fill Manual Fill-mode (input #1 is off) AutoFill Auto Fill-mode (input #1 is on) Likewise, the value shown on .
77 E.6 Commands Enter & Exit Fill Mode F Enter Fill Mode (from General Mode) x Exit Fill Mode (to General Mode) (small ‘x’) Inside the Fill Mode g Start filling (‘g’ stands for ‘go’) (like input #2 does). t Terminate an error status (like input #3 does).
78 s Get current status (small ‘s’) Response Example: Current_Status: W= 17.14 Tr= 6.65 Cv= 0.00 M=F A=I S= 0 Legend: Current (gross) weight=17.14, Last Tare=6.65, Next Correction Value=0.00, Mode=Fill mode, Activity= I dle (or: T are, F ast, S low) System staus=0 (0 is normal, otherwise it’s an error code).
79 E.7 Error Codes 101 Actual Filling Weight < Low Limit of 'Valid Result Limits'. 102 Actual Filling Weight > High Limit of 'Valid Result Limits'. 103 SetPoint < Low Limit of 'Valid Result Limits'. 104 SetPoint > High Limit of 'Valid Result Limits'.
80 Appendix F: Specifications F.1 Load Cell Input • 5 Volt excitation for upto 10 load cells (350 Ohm) • Compatible with 1, 2 & 3 mV/V load cells • Low noise wide bandwidth amplifier & 24 bit ADC F.
81 Appendix G: Trouble-shooting G.1 Card does not respond after PC power-on Q. Everything was OK, but after PC restart the card suddenly stopped responding. A. As specified in section D.4, after PC power on or off the serial communication (RS232/RS485) is likely to drop.
82 Appendix H: Zero & Tare There are two functions which are similar, yet actually different: Zero & Tare: • The Zero function supplies both manual and automatic ways to clear the gross weight . • The Auto-Tare function supplies a way to define the meaning of the setpoint parameter .
83 H.2 The Auto-Tare function This function supplies a way to define the meaning of the setpoint parameter: * When the ‘AutoTare’ option is not activated, the setpoint defines the requested final gross weight . That is, if the setpoint is 100 kg and the starting gross weight is 90 kg, the filling amount will be 10 kg.
W ARRANTY / DISCLAIMER OME GA ENGI NEERI NG, INC. warra nts this unit to be fre e of defe cts in mate rials and work mans hip for a per iod of 13 mont hs from date of purch ase. OMEGA ’ s W ARRANTY adds an additional one (1) month grace period to the normal one (1) year product warranty to cover handling and shipping time.
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