Operating Instructions

Transcription

1 Level and Pressure Operating Instructions VEGA-ASCII signal output VEGASCAN VEGA-ASCII in out

2 Contents Contents Safety information... 2 Note Ex area Configuration of the VEGA-ASCII interface Communication structure Enquiry of measured values Enquiry as single value Enquiry as range Enquiry as block with address Enquiry as single value with address Enquiry as ranges with address Enquiry for the software version Error message from VEGASCAN Setting of parameters of VEGASCAN Example program for enquiry VEGASCAN 850 (VISUAL BASIC 4.0) Safety information Please read this manual carefully, and also take note of country-specific installation standards (e.g. the VDE regulations in Germany) as well as all prevailing safety regulations and accident prevention rules. Note Ex area Please note the approval documents (yellow binder), and especially the included safety data sheet. For safety and warranty reasons, any internal work on the instruments, apart from that involved in normal installation and electrical connection, must be carried out only by qualified VEGA personnel. 2 VEGA-ASCII signal output VEGASCAN 850

3 Configuration of the VEGA-ASCII interface 1 Configuration of the VEGA-ASCII interface With the adjustment software VEGA Visual Operating (VVO), the configuration of the VEGA-ASCII interface can be carried out on VEGASCAN 850. Provide a connection between PC with VVO and VEGASCAN 850 with the RS 232 interface cable. The following illustration is displayed on the PC after switching on VEGASCAN 850 and starting VVO. Then the window "Configuration ASCII protocol opens. Here, you select the protocol mode (4 digits/ low resolution or 6 digits/high resolution). For the baud rate ( ), you make sure that the rate is set to the same value as the other BUS participants. For the BUS address, settings 1 to 9 are permitted. After the configuration settings, click to "Save, then to "Quit. In the window "Configuration measuring system click again to "Quit. Click to "Configuration, then to "Measuring system, in the next window "Configuration measuring system click to "Communication. BUS termination (only with RS 485 interface) When connecting VEGASCAN to the beginning or end of a bus chain, the instrument has to be terminated. Set the slide switch (beside the field bus terminal) to position "on. After setting up the VEGA-ASCII interface, provide the connection with the bus. In case of correct communication, the green LED marked "BA in the front plate of VEGASCAN lights. VEGA-ASCII signal output VEGASCAN 850 3

4 Communication structure 2 Communication structure The following functions are supported within the data communication between VEGASCAN 850 and the connected process data processing: - Mode (VEGASCAN 850 is Slave) VEGASCAN 850 does not transfer data without request. The master station must request all desired data. - Instrument address (default value # 1) By using a bus-compatible interface (e.g. RS 485), operation of up to 9 instruments on one interface is possible. - Presentation: All telegrams use ASCII characters and can be read in clear text. - Time-based image: No time periods required for transmission. - Value range (low resolution) The value to be transmitted is provided with a decimal point (penultimate position) independent of the actual position of the decimal point. - Value range (high resolution) The value to be transmitted is always transferred without decimal point. The decimal point as well as the unit of measurement of the DCS value are not transmitted by VEGASCAN 850! This information must be completed by the user with the software of the process data processing. 4 VEGA-ASCII signal output VEGASCAN 850

5 3 Enquiry of measured values 3.1 Enquiry as single value Low resolution This telegram reads a DCS value out of VEGASCAN 850. DCS Identifier number identification Number of bytes Range (ASCII) % CR Example % 001 CR Identifier: 1 character, "% identification: 1 character Chr (13) = CR = Carriage Return Total length of the telegram: 5 characters 1 repetition S1 no. S2 value2 identification Number of bytes DCS value or Range (ASCII) = # fault %CR Example = 001 # %CR Start character: S2 = 1 character "# Total length of the telegram: 12 or 13 characters Fault valid measured value FAULT 3 positions in front of the comma 1 decimal point 1 position after the comma "- with negative values " " with positive values VEGA-ASCII signal output VEGASCAN 850 5

6 High resolution The same enquiry can be also carried out with high resolution. The enquiry directed to VEGASCAN 850 remains the same; in the answer, more characters are used for the presentation of the measured value. DCS Identifier number identification Number of bytes Range (ASCII) % CR Example % 001 CR Identifier: 1 character, "% identification: 1 character Chr (13) = CR = Carriage Return Total length of the telegram: 5 characters 1 repetition S1 no. S2 value2 identification Number of bytes DCS value or Range (ASCII) = # fault %CR Example = 001 # %CR Start character: S2 = 1 character "# Total length of the telegram: 13 characters Fault valid measured value FAULT 6 digit value "- with negative values " " with positive values 6 VEGA-ASCII signal output VEGASCAN 850

7 3.2 Enquiry as range Low resolution This telegram reads a DCS value out of VEGASCAN 850. DCS Identifier number T1 Number identification Number of bytes Range (ASCII) % L CR Example % 001 L 001 CR Identifier: 1 character, "% T1 : Separator character = 1 character "L identification: 1 character Chr (13) = CR = Carriage Return Total length of the telegram: 9 characters n (n= stated number) repetitions S1 no. S2 value2 identification Number of bytes PLS-Wert Range (ASCII) = # oder Fault %CR Example = 001 # %CR Start character: S2 = 1 character "# Total length of the telegram: 12 or 13 characters Fault valid measured value FAULT 3 positions in front of the comma 1 decimal point 1 position after the comma "- with negative values " " with positive values VEGA-ASCII signal output VEGASCAN 850 7

8 High resolution The same enquiry can be also carried out with high resolution. The enquiry directed to VEGASCAN 850 is the same; in the answer, more characters are used for the presentation of the measured value. DCS Identifier number T1 Number identification Number of bytes Range (ASCII) % L CR Example % 001 L 001 CR Identifier: 1 character, "% T1 : Separator character = 1 character "L identification: 1 character Chr (13) = CR = Carriage Return Total length of the telegram: 9 characters n (n= stated number) repetitions S1 no. S2 value2 identification Number of bytes DCS value or Range (ASCII) = # fault %CR Example = 001 # %CR Start character: S2 = 1 character "# Total length of the telegram: n * 14 characters Fault valid measured value FAULT 6 digit value "- with negative values " " with positive values 8 VEGA-ASCII signal output VEGASCAN 850

9 3.3 Enquiry as block with address Low resolution This telegram reads in all DCS values from VEGASCAN 850 with the adjusted address, i.e. 255 values are always sent together. Each DCS value is assigned a number. Identifier Address T1 identification Number of bytes Range (ASCII) % 0..9, CR Example % 2, CR Identifier: 1 character, "% T1: 1 character ", (comma) identification: 1 character Chr (13) = CR = Carriage Return Total length of the telegram: 4 characters 255 repetitions S1 Adr T1 no. S2 value2 identification Number of bytes Range (ASCII) = 0..9, # DCS value or fault %CR Example = 2, 001 # %CR Address: Adr = 1 character VEGASCAN 850 address Separator character: T1 = 1 character ", (comma) Start character: S2 = 1 character "# Total length of the telegram: 255 * 14 or 15 characters Fault valid measured value FAULT 3 positions in front of the comma 1 decimal point 1 position after the comma "- with negative values " " with positive values VEGA-ASCII signal output VEGASCAN 850 9

10 High resolution The same enquiry can be also carried out with high resolution. The enquiry directed to VEGASCAN 850 remains the same; in the answer, more characters are used for the presentation of the measured value. Identifier Address T1 identification Number of bytes Range (ASCII) % 0..9, CR Example % 2, CR Identifier: 1 character, "% T1: 1 character ", (comma) identification: 1 character Chr (13) = CR = Carriage Return Total length of the telegram: 4 characters 255 repetitions S1 Adr T1 no. S2 value2 identification Number of bytes Range (ASCII) = 0..9, # DCS value or fault %CR Example = 2, 001 # %CR Address: Adr = 1 character VEGASCAN 850 address Separator character: T1 = 1 character ", (comma) Start character: S2 = 1 character "# Total length of the telegram: 255 * 16 characters Fault valid measured value FAULT 6 digit value "- with negative values " " with positive values 10 VEGA-ASCII signal output VEGASCAN 850

11 3.4 Enquiry as single value with address Low resolution This telegram reads out exactly one DCS value. In addition to the one described in chapter "3.3 Enquiry as block with address an address from 0 to 9 is transferred, so that several VEGASCAN 850 can be operated on one BUS system (e.g. via a RS 485 interface). DCS Identifier Address T1 number identification Number of bytes Range (ASCII) % 0..9, CR Example % 2, 001 CR Identifier: 1 character, "% T1: 1 character ", (comma) identification: 1 character Chr (13) = CR = Carriage Return Total length of the telegram: 7 characters 1 repetition S1 Adr T1 no. S2 value2 identification Number of bytes DCS value Range (ASCII) = 0..9, # or fault %CR Example = 2, 001 # %CR Address: Adr = 1 character VEGASCAN 850 address Separator character: T1 = 1 character ", (comma) Start character: S2 = 1 character "# Total length of the telegram: 14 or 15 characters Fault valid measured value FAULT 3 positions in front of the comma 1 decimal point 1 position after the comma "- with negative values " " with positive values VEGA-ASCII signal output VEGASCAN

12 High resolution The same enquiry can be also carried out with high resolution. The enquiry directed to VEGASCAN 850 is the same; in the answer, more characters are used for the presentation of the measured value. DCS Identifier Address T1 number identification Number of bytes Range (ASCII) % 0..9, CR Example % 2, 001 CR Identifier: 1 character, "% T1: 1 character ", (comma) identification: 1 character Chr (13) = CR = Carriage Return Total length of the telegram: 7 characters 1 repetition S1 Adr T1 no. S2 value2 identification Number of bytes Range (ASCII) = 0..9, # DCS value or fault %CR Example = 2, 001 # %CR Address: Adr = 1 character VEGASCAN 850 address Separator character: T1 = 1 character ", (comma) Start character: S2 = 1 character "# Total length of the telegram: 16 characters Fault valid measured value FAULT 6 digit value "- with negative values " " with positive values 12 VEGA-ASCII signal output VEGASCAN 850

13 3.5 Enquiry as ranges with address Low resolution This telegram reads in a range of DCS values. The number is transmitted with the enquiry. In addition to the one described in chapter "3.3 Enquiry as block with address an address from 0 to 9 is transferred, so that several VEGASCAN 850 can be operated on one BUS system (e.g. via a RS 485 interface). Identifier Address T1 number T1 number identification Number of bytes Range (ASCII) % 0..9, L CR Example % 2, 001 L 2 CR Identifier: 1 character, "% T1: 1 character ", (comma) T2: 1 character "L identification: 1 character Chr (13) = CR = Carriage Return Total length of the telegram: 11 characters n (n= stated number) repetitions S1 Adr T1 no. S2 value2 identification Number of bytes Range (ASCII) = 0..9, # DCS value or fault %CR Example = 2, 001 # %CR Address: Adr = 1 character VEGASCAN 850 address Separator character: S2 = 1 character ", (comma) Start character: S3 = 1 character "# Total length of the telegram: 14 or 15 characters Fault valid measured value FAULT 3 positions in front of the comma 1 decimal point 1 position after the comma "- with negative values " " with positive values VEGA-ASCII signal output VEGASCAN

14 High resolution The same enquiry can be also carried out with high resolution. The enquiry directed to VEGASCAN 850 is the same; in the answer, more characters are used for the presentation of the measured value. Identifier Address T1 number T1 number identification Number of bytes Range (ASCII) % 0..9, L CR Example % 2, 001 L 2 CR Identifier: 1 character, "% T1: 1 character ", (comma) T2: 1 character "L identification: 1 character Chr (13) = CR = Carriage Return Total length of the telegram: 11 characters n (n= stated number) repetitions S1 Adr T1 no. S2 value2 identification Number of bytes Range (ASCII) = 0..9, # DCS value or fault %CR Example = 2, 001 # %CR Address: Adr = 1 characters VEGASCAN 850 address Separator character: S2 = 1 character ", (comma) Start character: S3 = 1 character "# Total length of the telegram: 16 characters Fault valid measured value FAULT 6 digit value "- with negative values " " with positive values 14 VEGA-ASCII signal output VEGASCAN 850

15 3.6 Enquiry for the software version With this enquiry, the software version in VEGASCAN 850 can be identified. Address Identifier VEGASCAN Reserve Enquiry identification Number of bytes Range (ASCII) % READ VERSION CR Example % 2 00 READ VERSION CR Identifier: 1 character, "v ("V ) Call up: 13 characters " READ VERSION (for READ and for VERSION 1 blank character each) identification: 1 character Chr (13) = CR = Carriage Return Total length of the telegram: 18 characters Address Identifier VEGASCAN Reserve Enquiry identification Number of bytes Range (ASCII) = Answer text CRLF Example = 2 00 VEGASCAN850 V2.17 CRLF Address: Adr = 1 character VEGASCAN 850 address Reserve: 2 characters here "00 Answer: 17 characters text Total length of the telegram: 23 characters 3.7 Error message from VEGASCAN 850 If an enquiry was not understood correctly by VEGASCAN 850 or the enquiry was transferred incorrectly, VEGASCAN sends an error message. Error text "ERROR 5 "ERROR 6 Meaning - Identifier unknown - Telegram incomplete Telegram cannot be evaluated VEGA-ASCII signal output VEGASCAN

16 Parameter setting of VEGASCAN Setting of parameters of VEGASCAN 850 VEGASCAN 850 offers the possibility to enquire or modify various parameters (measurement loop-related). The following list gives an overview of the parameters involved: Parameter name possible access mode Integration time reading writing Scaling (0 %) reading writing Scaling (100 %) reading writing The enquiry or modification of parameters via the bus is always done according to the same procedure. Each enquiry starts with identifier "?, followed by "R for Read or "W for Write as well as the identifier for the parameter. The telegrams are completed by the addresses of VEGASCAN and the component number, as well as by the value to be written. If an order was successfully transferred to a connected instrument, the value or the information about the activity is reported. For further information, please contact one of our employees. 16 VEGA-ASCII signal output VEGASCAN 850

17 Example program for enquiry VEGASCAN Example program for enquiry VEGASCAN 850 (VISUAL BASIC 4.0) VEGAASCII.VBP Form=vegaascii.frm Object={648A5603-2C6E-101B-82B }#1.1#0; MSCOMM32.OCX ProjWinSize=168,207,248,215 ProjWinShow=2 IconForm="ASCDEMO" HelpFile="" Command="" Name="ASCII" HelpContextID="0" StartMode=0 VersionCompatible32="0" VersionCompatible="0" MajorVer=1 MinorVer=0 RevisionVer=0 AutoIncrementVer=0 ServerSupportFiles=0 VersionCompanyName=" " VERSION 4.00 Begin VB.Form ASCDEMO Caption = "VEGA ASCII DEMO" ClientHeight = 7095 ClientLeft = 60 ClientTop = 345 ClientWidth = 9480 Height = 7500 Left = 0 LinkTopic = "Form2" ScaleHeight = 473 ScaleMode = 3 'Pixel ScaleWidth = 632 Top = 0 Width = 9600 Begin VB.ListBox List1 Height = 6105 Left = 150 TabIndex = 2 Top = 270 Width = 8985 Begin VB.Timer Timer Enabled = 0 'False Interval = 100 Left = 720 Top = 6510 Begin VB.CommandButton e Cancel = -1 'True Caption = "Exit" Height = 405 Left = 2520 TabIndex = 1 Top = 6570 Width = 1395 Begin VB.CommandButton Run Caption = "&Start" Default = -1 'True Height = 405 Left = 4350 TabIndex = 0 Tag = "0" Top = 6570 Width = 1425 Begin VB.Shape Led FillColor = &H0000FF00& FillStyle = 0 'Solid Height = 165 Left = 390 Top = 6570 Width = 135 Begin MSCommLib.MSComm MSComm Left = 1200 Top = 6510 _ExtentX = 1005 _ExtentY = 1005 _Version = DTREnable = 0 'False InBufferSize = 512 InputLen = 200 OutBufferSize = 100 RThreshold = 1 SThreshold = 1 EOFEnable = -1 'True Attribute VB_Name = "ASCDEMO" Attribute VB_Creatable = False Attribute VB_Exposed = False ' ' ASCDEMO.FRM ' Copyright (c) 1999 VEGA ' by Gros Thoms ' Option Explicit ' Speicher fuer den Empfang Dim ReceiveBuffer As String ' Fehlerzaehler Dim InAction As Integer ' Speicher fuer die Werte und den Status Dim Status(255) As Integer Dim PLS(255) As Long ' Start und e Dim StartIndex As Integer Dim LenIndex As Integer Private Sub e_click() ' Programm beenden Unload Me Sub VEGA-ASCII signal output VEGASCAN

18 Example program for enquiry VEGASCAN 850 Private Sub Form_Load() Dim i As Integer ' Speicher initialisieren For i = 1 To 255 Status(i) = False PLS(i) = 0 Next i ' Fehlerzaehler initialisieren InAction = 0 ' Bereich einstellen StartIndex = 1 LenIndex = 30 ' Werte anzeigen DisplayValues Sub Private Sub Form_Unload(Cancel As Integer) ' Timer stoppen Timer.Enabled = False ' Serielle Schnittstelle schliessen. If MSComm.PortOpen = True Then MSComm.PortOpen = False Sub Private Sub MSComm_OnComm() Dim InString As String '? Wurden characters empfangen If MSComm.CommEvent = comevreceive Then ' Anzeige für Kommunikation If Led.FillColor = Me.BackColor Then Led.FillColor = RGB(0, 255, 0) Else Led.FillColor = Me.BackColor ' Prüfen, ob Daten vorhanden sind. Do While MSComm.InBufferCount > 0 ' Fehlerzaehler auf 1 Sec InAction = 10 ' Daten lesen. Call DecodeFrame(MSComm.Input) Loop Sub Private Sub Run_Click() '? Start or Stop If Run.Tag = "0" Then '? Schnittstelle geoeffnet If MSComm.PortOpen = True Then ' -> schliessen MSComm.PortOpen = False ' COM1 einsetzen. MSComm.CommPort = 1 ' 9600 Baud, keine Paritaet, 8 Datenbits und 1 Stopbit MSComm.Settings = "9600,N,8,1" ' Schnittstelle oeffnen. MSComm.PortOpen = True ' Timer starten Timer.Enabled = True If MSComm.PortOpen Then ' Button umschalten Run.Caption = "&Stop" Run.Tag = "1" Else '? Schnittstelle geoeffnet If MSComm.PortOpen = True Then ' -> schliessen MSComm.PortOpen = False ' Timer ausschalten Timer.Enabled = False ' Button umschalten Run.Caption = "&Start" Run.Tag = "0" Sub Private Sub Timer_Timer() If InAction = 0 Then ' Speicher loeschen ReceiveBuffer = "" ' Starus loeschen ClearValues ' Ausgabe der Anfrage MSComm.Output = "%" + Format(StartIndex, "000") + "L" + Format$(LenIndex, "000") + Chr$(13) Else ' Fehlerzaehler benutzen InAction = InAction - 1 '? Grenze erreicht If InAction = 0 Then ' Werte anzeigen DisplayValues Sub 18 VEGA-ASCII signal output VEGASCAN 850

19 Example program for enquiry VEGASCAN 850 Private Sub DecodeFrame(Rec As String) Dim idx As Integer Dim Value As Long Dim PlsString As String Dim SingleValue As String Dim p As Integer ' Alle characters aufsammeln ReceiveBuffer = ReceiveBuffer + Rec ' Schon 1 Wert empfangen p = InStr(ReceiveBuffer, Chr$(13)) If p > 0 Then ' -> Einzelnen Wert ausschneiden SingleValue = Left$(ReceiveBuffer, p - 1) ReceiveBuffer = Mid$(ReceiveBuffer, p + 1) Else SingleValue = "" If Len(SingleValue) > 9 Then ' Frame pruefen ' =001#FAULTCR ' =001# CR If Left(SingleValue, 1) = "=" Then If Mid$(SingleValue, 5, 1) = "#"Then idx = Val(Mid$(SingleValue, 2,3)) If Mid$(SingleValue, 9, 1) > "9" Then Status(idx) = False Else Status(idx) = True ' Zahlenwert ausschneiden PlsString = Mid$(SingleValue, 6) ' Vorzeichen or ' ' beachten If Mid$(PlsString, 1, 1) = " " Then PlsString = Mid$(PlsString, 2) ' Wenn '.' im Telegramm -> entfernen p = InStr(PlsString, ".") If p > 0 Then PlsString = Left$(PlsString, p - 1) + Mid$(PlsString, p + 1) ' e erkennen p = InStr(PlsString, "%") If p > 0 Then PlsString = Left$(PlsString, p - 1) ' Text in Zahl wandeln PLS(idx) = CLng(PlsString) ' e erreicht? If idx = (StartIndex + LenIndex) - 1 Then ' Fehlerzaehler = 0 InAction = 0 ' Werte Anzeigen DisplayValues Sub Public Sub DisplayValues() Dim i As Integer Dim Disp As String ' Anzeige loeschen List1.Clear ' Schleife ueber alle Werte For i = StartIndex To (StartIndex + LenIndex) - 1 ' Anzeige Text aufbereiten Disp = "PLS " + Format$(i, "000") + " = " If Status(i) Then Disp = Disp + Format$(PLS(i), " ") Else Disp = Disp + "---" ' Anzeigen List1.AddItem Disp Next i Sub Public Sub ClearValues() Dim i As Integer ' Alle Statusinformation loeschen For i = StartIndex To (StartIndex + LenIndex) - 1 Status(i) = False Next i Sub VEGA-ASCII signal output VEGASCAN

20 VEGA Grieshaber KG Am Hohenstein 113 D Schiltach Phone ( ) 50-0 Fax ( ) ISO 9001 The statements on types, application, use and operating conditions of the sensors and processing systems correspond to the latest information at the time of printing. Technical data subject to alterations / March 2000