EXFO FTB-500 (Window XP) - Manual (Page 227)

Using FTB Products in an Automated Test Environment
FTB-500 217
Standard Status Data Structure
The following table presents a summary of the possible operations on ESR
and ESE registers.
STB and SRE
The status byte register and service request enable register information is
presented in the following table.
Register Read Write Clear
ESR Use *ESR?. Impossible
to write.

Use *CLS.

Read the register.
ESE Use *ESE?. Use *ESE. Use *ESE with a value equal to 0.
Bits Mnemonics Bit Value
7 Not Used (N.U.) 0
6 Master Summary Status (MSS)/ Service
Request (RQS)
64
5 Event Summary Bit (ESB) 32
4 Message Available (MAV) 16
3 Not Used (N.U.) 0
2 Error Available (EAV) 4
1 Not Used (N.U.) 0
0 Not Used (N.U.) 0