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1-5
Introduction to Programming
Program Message Syntax
Instructions
Instructions (both commands and queries) normally appear as a string
embedded in a statement of your host language, such as BASIC, Pascal, or C.
The only time a parameter is not meant to be expressed as a string is when the
instruction’s syntax definition specifies <block data>, such as <learn string>.
There are only a few instructions that use block data.
Instructions are composed of two main parts:
• The header, which specifies the command or query to be sent.
• The program data, which provide additional information needed to clarify
the meaning of the instruction.
Instruction Header
The instruction header is one or more mnemonics separated by colons (:) that
represent the operation to be performed by the instrument. The command tree
in chapter 5 illustrates how all the mnemonics can be joined together to form a
complete header (see chapter 5, “Programming and Documentation
Conventions”).
The example in Figure 1-1 is a command. Queries are indicated by adding a
question mark (?) to the end of the header. Many instructions can be used as
either commands or queries, depending on whether or not you have included
the question mark. The command and query forms of an instruction usually
have different program data. Many queries do not use any program data.
White Space (Separator)
White space is used to separate the instruction header from the program data.
If the instruction does not require any program data parameters, you do not
need to include any white space. In this manual, white space is defined as one
or more space characters. ASCII defines a space to be character 32 (in decimal).
Program Data
Program data are used to clarify the meaning of the command or query. They
provide necessary information, such as whether a function should be on or off,
or which waveform is to be displayed. Each instruction’s syntax definition shows
the program data, as well as the values they accept. The section “Program Data
Syntax Rules” in this chapter has all of the general rules about acceptable values.
When there is more than one data parameter, they are separated by commas(,).
Spaces can be added around the commas to improve readability.
- 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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