User`s guide
Table Of Contents
- Agilent E3632A DC Power Supply
- Table of Contents
- List of Figures
- List of Tables
- 1 Getting Started
- 2 Operation and Features
- Overview
- Constant Voltage Operation
- Constant Current Operation
- Storing and Recalling Operating States
- Programming the Overvoltage Protection
- Programming the Overcurrent Protection
- Remote Voltage Sensing
- Disabling the Output
- System-Related Operations
- Remote Interface Configuration
- GPIB Interface Configuration
- RS-232 Interface Configuration
- Calibration
- 3 Remote Interface Reference
- SCPI Command Summary
- Introduction to the SCPI Language
- Simplified Programming Overview
- Using the APPLy Command
- Output Settings and Operation Commands
- Triggering Commands
- System-Related Commands
- Calibration Commands
- RS-232 Interface Commands
- SCPI Status Registers
- What is an event register?
- What is an enable register?
- SCPI status system
- The Questionable Status register
- The Standard Event register
- The Status Byte register
- Using Service Request (SRQ) and Serial POLL
- Using *STB? to read the Status Byte
- Using the Message Available Bit (MAV)
- To interrupt your bus controller using SRQ
- To determine when a command sequence is completed
- Using *OPC to signal when data is in the output buffer
- Status Reporting Commands
- Halting an Output in Progress
- SCPI Conformance Information
- IEEE-488 Conformance Information
- 4 Error Messages
- 5 Application Programs
- 6 Tutorial
- 7 Characteristics and Specifications
3 Remote Interface Reference
SCPI Status Registers
114 E3632A User’s Guide
Using *STB? to read the Status Byte
The *STB? (Status Byte query) command is similar to a
serial poll but it is processed like any other instrument
commands. The *STB? command returns the same result as
a serial poll but the request service bit (bit 6) is not cleared.
The *STB? command is not handled automatically by the
IEEE- 488 bus interface hardware and will be executed only
after previous commands have completed. Polling is not
possible using the *STB? command. Executing the *STB?
command does not clear the Status Byte summary register.
Using the Message Available Bit (MAV)
You can use the Status Byte “Message Available” bit (bit 4)
to determine when data is available to read into your bus
controller. The power supply subsequently clears bit 4 only
after all messages have been read from the output buffer.
CAUTION
The IEEE-488 standard does not ensure synchronization between your
bus controller program and the instrument. Use the *OPC? command
to guarantee that commands previously sent to the instrument have
completed. Executing a serial poll before a *RST, *CLS or other
commands have completed can cause previous conditions to be
reported.