Addendum for Option 0003 and 1052 GPIB Converter
Contents
1. ESI EQUITY GPIB Interface TE 0003 TE 1052 Instructions Introduction The GPIB communications is achieved through an ICS Electronics 4809A internal or 4899A external GPIB to Modbus Interface Converter henceforth referred to as Converter GPIB commands are converted to serial Modbus commands that are transmitted over RS 232 The Converter take care of calculating block checksums that are required for communications to and from the Series F4 F4T or EZ Zone Controller Customer Supplied GPIB Cable RS 232 ICS 4809A 4899A Controller lt gt __ GPIB to Modbus Converter Communications Parameters The Converters are set at the factory for 9600 baud The chamber s Controller must also be configured for 9600 baud All chambers currently ship configured for 9600 baud If you need to change the setting on an older 1000 Series models 105A and 115 chambers manufactured before June 2003 this is located in the F4 Temperature Controller s Main Page Go to Setup Communications If you are unable to enter this menu or change the setting from 19200 then this menu has been locked If a password is required call TestEquity See the Series F4 User s Manual for instructions on how to clear the lock and navigate through the menus It is important to remember that GPIB interface messages communicate directly with the Converters as the talk listen addressed device The Controller is NOT the GPIB device Interface me2. 07H and 1207C only Static temperature set point 300 Static humidity set point 319 Model 123H 1007H and 1207C only Temperature set point during a profile 4122 Except model 105 with 97 controller Temperature set point during a profile 5009 Model 105 with 97 controller only Humidity set point during a profile 4123 Model 123H 1007H and 1207C only Digital Output 1 Event 1 in static set point mode 2000 Not applicable for model 105 with 97 controller e Digital Output 2 Event 2 in static set point mode 2010 Not applicable for model 105 with 97 controller The entire listing of Modbus registers for the Series F4 Temperature Controller are found in the Series F4 User s Manual Chapter 7 The entire listing of Modbus registers for the Series 96 Temperature Controller are found in the Series 96 User s Manual pages 7 7 and A 3 Common Modbus Registers for F4T Controller F4T Mode The following common registers are applicable in the F4T Mode Data Map 1 Some F4T parameters are contained within 32 bits IEEE Float Notice that only one low order of the two registers is listed By default the low order word contains the two low bytes of the 32 bit parameter As an example in the table below see Actual Chamber Temperature Note that it lists register 27586 Because this parameter is a float it is actually represented by registers 27586 low order bytes and 27587 high order bytes Parameter Name Register Da
3. 1 is Power W 16594 62 W 16596 63 Event 2 is Humidity in Humidity models W 16596 62 Event 2 is Purge in Temp only models Event 2 is LN2 in Model 3007C The same syntax applies to events 3 through 7 Event 3 16598 Event 4 16598 Event 5 16600 Event 6 16602 Event 7 16604 Manual Ramp Parameters Ramp to Set Point without a profile Ramp Action Temperature Ramp Scale Temp Minutes Ramp Scale Temp Hours Ramp Rate Temperature Rev 3 W 2794 where is one of the four numerical choices below Off 62 Startup 88 Set Point 85 Both 13 W 2796 57 W 2796 39 WF 2798 value 0 to 99 999 Page 6 of 7 Additional Resources The ICS GPIB Modbus Interface manual provides detailed information on the Interface Converter Additional resources and LabVIEW drivers can be downloaded from http www testequity com GPIB IMPORTANT NOTE The examples shown in documentation from ICS are for illustration purposes only They do not represent the correct setup or configuration for TestEquity chambers Sample programs from ICS may change critical setup parameters resulting in improper chamber operation They are provided as a guideline for how to write your own programs only Correct setup parameters are documented in the TestEquity chamber manuals ICS Manual Errata To reflect the standard decimal point configuration of 0 0 in TestEquity chambers the ICS Electronics man
4. ature Controller Modbus Register Read Write Commands for the F4 Controller R reg n Read register command Reg Modbus register n number of registers to send W reg data Write register command Reg Modbus register Data ASCII data written as 16 bit decimal value NOTE The is optional and is included so programs like ICS s GPIB Keyboard control programs can automatically read back and display the response from a query Modbus Register Read Write Commands for the F4T Controller The F4T Controller uses two consecutive register to control a value or to read back a process variable The two registers hold an IEEE 754 32 bit floating point word The registers are read and written to in the low word upper word order The RF query reads a 32 bit floating point value from two sequential register in low word upper word order The RF does not require the number of register to read since it is fixed at two registers RF reg Read register command Reg Modbus register plus next consecutive register The WF command writes the num value in floating point format to two consecutive registers starting with the low word register WF reg data Write register command Reg Modbus register plus next consecutive register Data ASCII data written as a direct numerical value Rev 3 Page 2 of 7 Common Modbus Registers for F4 Controller Actual chamber temperature reading 100 Actual chamber humidity reading 104 Model 123H 10
5. program Command R 606 1 lt If gt Send read command to register 606 Response iData lt lf gt Returned variable iData represents ASCII numeric characters that are converted in this example to integer O no decimal point 1 one decimal point Command R 100 1 lt If gt Send read command to register 100 Response fTemp lt lf gt Read the value of register 100 ffemp represents ASCII numeric characters converted to float type if iData 1 then Check iData fTemp fTemp 10 1 means that data has decimal and endif we need to divide by ten print Chamber Temp is ffemp Rev 082815 Page 5 of 7 Set Chamber Setpoint Examples for F4 Controller Command W 300 230 lt If gt Command W 300 1005 lt If gt Command W 300 255 lt If gt Send write command to register 300 and change the setpoint to 23 0 degrees Send write command to register 300 and change the setpoint to 100 5 degrees Send write command to register 300 and change the setpoint to 25 5 degrees F4T Controller Examples Data Map 1 Temperature and Humidity Set Points and Readings Write Temperature Set Point Write Humidity Set Point Read Chamber Temperature Read Chamber Humidity WF 2782 value WF 2942 value RF 27586 RF 28906 Event Outputs Chamber Functions and uncommitted outputs 7 total Turn Event 1 ON Turn Event 1 OFF Turn Event 2 ON Turn Event 2 OFF W 16594 63 Event
6. r with GPIB requires commands to be made in a standardized sequence The sequence described here is language independent meaning that descriptions of all of the possible languages are not given Instead given GPIB commands are shown as strings with an example language given to show program flow Comments are indicated with exclamation point Samp_488 Command to GPIB interface card STRING Strings sent to GPIB device at specified address lt lf gt Individual linefeed character lt cr gt Individual carriage return character language Sample language element Reset amp Initialization Example for F4 Controller This sequence should be performed once before establishing communications to the Temperature Controller Command IFC Reset GPIB interface card Command RST lt lIf gt Send reset command to ICS 4899A Command D 300 lt lIf gt Set ICS 4899A timeout to 300 ms Reading Chamber Temperature Example for F4 Controller The Temperature Controller sends data over the Modbus interface with an implied decimal point It is left to the user to remember this and to scale the data accordingly The Temperature Controller has been configured by TestEquity to display one decimal point in the temperature reading If the configuration should change then the program would not report the correct temperature reading To remedy this problem always read the number of decimal points used by Analog Input before running the
7. ssages that arrive at the Converter can be interpreted and used locally by the Converter or interpreted and re transmitted to the Controller Data returning from the Controller is received by the Converter which then examines the block checksum characters strips them off and re transmits the desired data to the GPIB interface for use by the controller Rev 082815 Page 1 of 7 Modbus Communication The Temperature Controller relies on a communication protocol called Modbus which offers multidrop serial capability for serial devices reliable communication and standardized commands Since Modbus allows more than one device to share communications ports each device requires a Modbus address The C command of the Converter sets the Modbus address of the Temperature Controller From that point the Converter will use that address to communicate to the Temperature Controller Each Modbus device has its own characteristics and data items that are examined and or set Data for the device is organized into registers Register data is set by sending a Write command to a specific register and is examined by sending a Read command to a register The commands to read and write data in registers are performed by commands sent to the Converter These commands do resemble the final command that the Temperature Controller sees but the Converter also generates and sends a block checksum based on all the characters of each message and sends it to the Temper
8. ta Type and Access Read or Write Temperature Set Point 2782 IEEE Float RW Temp Closed Loop Set Point 2810 Actual Chamber Temperature 27586 IEEE Float R Humidity Set Point 2942 IEEE Float RW Hum Closed Loop Set Point 2970 IEEE Float R Actual Chamber Humidity 28906 IEEE Float R Event 1 16594 Unsigned 16 bit RW Event 2 16596 Unsigned 16 bit RW Event 3 16598 Unsigned 16 bit RW Event 4 16600 Unsigned 16 bit RW Event 5 16822 Unsigned 16 bit RW Event 6 16824 Unsigned 16 bit RW Event 7 16826 Unsigned 16 bit RW Instantaneous Set Point during a ramp Rev 082815 Page 3 of 7 F4 Compatibility Mode for F4T Controller The following common registers are available in the F4 Compatibility Mode Data Map 2 This will allow you to use software that was written for the original F4 Controller Only a limited set of parameters are available in this compatibility mode but it should be sufficient for most applications Parameter Name Register Data Type and Access Read or Write Temperature Set Point 300 16 bit Signed RW Actual Chamber Temperature 100 16 bit Signed R Humidity Set Point 300 16 bit Signed RW Actual Chamber Humidity 319 16 bit Signed R Event 1 2000 16 bit Signed RW Event 2 2010 16 bit Signed RW Event 3 2020 16 bit Signed RW Event 4 2030 16 bit Signed RW Event 5 2040 16 bit Signed RW Event 6 2050 16 bit Signed RW Event 7 2060 16 bit Signed RW Rev 3 Page 4 of 7 Programming Sequences Communicating to the Temperature Controlle
9. ual Page 3 24 should be corrected as follows 3 8 4 Writing to the Modbus Device The nature of the command depends upon the specific Modbus device Simple writes are handled with the W command In the following example a value of 50 0 is written to register 300 i e W 300 500 sets temperature setpoint C7 W 300 500 concatenated command Writes to multiple registers are possible with the WB command Rev 082815 Page 7 of 7
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