Lake Shore Model 340 Temperature Controller User’s Manual
9-4
Remote Operation
The Standard Event Status Enable Register allows the user to enable any of the Standard Event Status
Register reports. The Standard Event Status Enable command (
Q
ESE) sets the Standard Event Status
Enable Register bits. If a bit of this register is set, then that function is enabled. To set a bit, send the
command
Q
ESE with the bit weighting for each bit you want to be set added together. Also refer to the
Q
ESE
command discussion.
The Standard Event Status Enable Query,
Q
ESE?, reads the Standard Event Status Enable Register.
Q
ESR?
reads the Standard Event Status Register. Once this register has been read, the bits are reset to zero.
Power On (PON) Bit (7)
– This bit is set when an controller off-on-off transition has been detected.
Command Error (CME) Bit (5)
– If bit 5 is set, a command error has been detected since the last reading.
This means that the controller could not interpret the command due to a syntax error, an unrecognized
header, unrecognized terminators, or an unsupported command.
Execution Error (EXE) Bit (4)
– If bit 4, the EXE bit is set, an execution error has been detected. This occurs
when the controller is instructed to do something not within its capabilities.
Device Dependent Error (DDE) Bit (3)
– A device dependent error has been detected if the DDE bit is set.
The actual device dependent error can be found by executing the various device dependent queries.
Query Error (QYE) Bit (2)
– The QYE bit indicates a query error. It occurs rarely and involves loss of data
because the output queue is full.
Operation Complete (OPC) Bit (0)
– This bit is generated in response to the
Q
OPC common command.
It indicates when the Model 340 has completed all selected pending operations.
9.1.4 IEEE Interface Example Programs
Two BASIC programs are included to illustrate the IEEE-488 communication functions of the instrument.
The first program was written in Visual Basic. Refer to Paragraph 9.1.4.1 for instructions on how to setup
the program. The Visual Basic code is provided in Table 9-2. The second program is written in Quick Basic.
Refer to Paragraph 9.1.4.3 for instructions on how to setup the program. The Quick Basic code is provided
in Table 9-3. Finally, a description of operation common to both programs is provided in Paragraph 9.1.4.5.
While the hardware and software required to produce and implement these programs not included with the
instrument, the concepts illustrated apply to almost any application where these tools are available.
9.1.4.1
IEEE-488 Interface Board Installation for Visual Basic Program
This procedure works for Plug and Play GPIB Hardware and Software for Windows 98/95. This example uses
the AT-GPIB/TNT GPIB card.
1. Install the GPIB Plug and Play Software and Hardware using National Instruments instructions.
2. Verify that the following files have been installed to the Windows System folder:
a. gpib-32.dll
b. gpib.dll
c. gpib32ft.dll
Files b and c support any 16-bit Windows GPIB applications being used.
3. Locate the following files and make note of their location. These files will be used during the development
process of a Visual Basic program.
a. Niglobal.bas
b. Vbib-32.bas
NOTE:
If the files in Steps 2 and 3 are not installed on your computer, they may be copied from your
National Instruments setup disks or they may be downloaded from www.natinst.com.
4. Configure the GPIB by selecting the System icon in the Windows 98/95 Control Panel located under
Settings on the Start Menu. Configure the GPIB Settings as shown in Figure 9-1. Configure the DEV12
Device Template as shown in Figure 9-2. Be sure to check the Readdress box.