EXFO IQS-600 Integrated Qualification System - Manual (Page 187)

Using IQS Products in an Automated Test Environment
Integrated Qualification System 179
Standard Status Data Structure
Standard Status Data Structure
Each device that is physically connected to the GPIB bus has four status
registers with a structure complying with the IEEE 488.2 standard. These
registers allow the controller to monitor events and get useful information
on the status of the devices it controls.

Standard Event Status Register (ESR)

Standard Event Status Enable Register (ESE)

Status Byte Register (STB)

Service Request Enable Register (SRE)
ESR and ESE
The standard event status register and status enable register information is
presented in the following table.
Bits Mnemonics Bit Value
7 Power On (PON) 128
6 User Request (URQ) 64
5 Command Error (CME) 32
4 Execution Error (EXE) 16
3 Device-Dependent Error (DDE) 8
2 Query Error (QYE) 4
1 Not Used (N.U.) 0
0 Operation Complete (OPC) 1