EXFO FTB-500 - Manual (Page 240)

Using FTB Products in an Automated Test Environment
232 FTB-500
Standard Status Data Structure
Standard Status Data Structure
Each device that is physically connected to the remote 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