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2-9
Programming Getting Started
Receiving Information from the Instrument
Receiving Information from the Instrument
After receiving a query (command header followed by a question mark), the
instrument interrogates the requested function and places the answer in its
output queue. The answer remains in the output queue until it is read or another
command is issued. When read, the answer is transmitted across the interface
to the designated listener (typically a controller). The input statement for
receiving a response message from an instrument’s output queue typically has
two parameters; the device address, and a format specification for handling the
response message. For example, to read the result of the query command
:CHANNEL1:COUPLING? you would execute the HP BASIC statement:
ENTER <device address> ;Setting$
where <device address> represents the address of your device. This would
enter the current setting for the channel one coupling in the string variable
Setting$.
All results for queries sent in a program message must be read before another
program message is sent. For example, when you send the query
:MEASURE:RISETIME?, you must follow that query with an input statement.
In HP BASIC, this is usually done with an ENTER statement.
Sending another command before reading the result of the query clears the
output buffer and the current response. This also causes an error to be placed
in the error queue.
Executing an input statement before sending a query causes the controller to
wait indefinitely.
The format specification for handling response messages is dependent on both
the controller and the programming language.
- Oscilloscopes and 1
- Agilent 54621D/22D/41D/42D 1
- Mixed-Signal Oscilloscopes 1
- Programming the Oscilloscope 2
- Capture 3
- Analyze 3
- In This Book 4
- Contents 5
- 6 Status Reporting 6
- Introduction to Programming 7
- Talking to the Instrument 9
- Program Message Syntax 10
- Duplicate Mnemonics 14
- Query Command 15
- Program Header Options 16
- Program Data Syntax Rules 17
- Program Message Terminator 19
- Programming Getting Started 21
- Initialization 23
- Autoscale 24
- Setting Up the Instrument 25
- Example Program 26
- Using the DIGitize Command 27
- String Variables 30
- Numeric Variables 31
- Multiple Queries 33
- Instrument Status 33
- Programming over GPIB 35
- Interface Capabilities 37
- Command and Data Concepts 37
- Addressing 38
- Communicating Over the Bus 39
- Bus Commands 40
- Programming over RS-232-C 41
- Interface Operation 43
- Configuring the Interface 46
- Lockout Command 48
- Conventions 49
- Command Set Organization 51
- Table 5-1 52
- Alphabetic Command Reference 52
- The Command Tree 54
- Truncation Rules 63
- Infinity Representation 64
- Response Generation 64
- Program Examples 66
- Status Reporting 67
- Figure 6-1 69
- Figure 6-2 72
- Figure 6-2 (continued) 73
- Status Byte Register (SBR) 74
- Trigger Event Register (TRG) 76
- Arm Event Register (ARM) 79
- Error Queue 80
- Output Queue 81
- Message Queue 81
- Clearing Registers and Queues 82
- Figure 6-3 82
- Reference 83
- <drive>:\setup.exe 85
- To start the help file 87
- Introduction 90
- Suffix Multipliers 91
- Programmer’s Quick Reference 100
- Commands and Queries 100
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