Operating instructions

R&S ESCI IEC/IEEE-Bus Commands of HP Models
1166.6004.12 6.265 E-1
IEC/IEEE-Bus Status Reporting
The assignment of status bits by commands R1, R2, R3, R4, RQS is supported. The STB command
and the serial poll respond with an 8-bit value having the following assignment:
The return value of a serial poll is to use the STB command in order to identify the reason for the
service request. The bits returned by the STB command are mapped in the same way as for the RQS
command.
Bit enabled by RQS
1 (Units key pressed)
2 (End of Sweep)
3 (Device Error)
4 (Command Complete)
5 (Illegal Command)
6 (Service Request)
Bits 0 and 7 are not used and always have the value 0.
It should be noted that the R&S ESCI will report any key pressed on the front panel (if bit 1 was
enabled) rather than only the unit keys.
Additionally there is a difference in the handling of bit 6. This bit reflects the status of the SRQ line of
the GPIB bus on the HP 8590 analyzers. With the R&S ESCI this is not possible. Therefore this bit will
be set as soon as any of the bits 1 to 5 is set, but it will not be cleared on a serial poll.