IEEE 488.2 compatible Status Structures
Status reporting
Status Byte Register - read with *STB?
read by Serial Poll
RQS
0
ESB
MAV
Comm.
T.O.
PRIM
ERR
0 SRQ
IS
MSS
read by *STB?
RQS................. the IEEE 488.1 Service Request Flag read by Serial Poll.
MSS ................ the Master Summary Status is generated by performing a bit by bit AND
of the Status Byte and the Service Request Enable Register and then
ORing the resulting bits.
ESB ................. the Event Summary Bit generation is described under Standard Event
Status Enable Register.
MAV ............... the Message Available Status Bit is set when there is data in the Output
Queue.
Comm. T.O. .... set when a communication time out event occurs. Cleared when the
TORST command is issued.
PRIM_ERR..... this is the Primary Status Summary Bit.
SRQ_IS ........... this is the Channels Events Summary Bit.
Service Request Enable Register - set with *SRE, read with
*SRE?
0 0
ESB
MAV
Comm.
T.O.
PRIM
ERR
0 SRQ
IS
The Service Request Enable Register has mask bits at positions corresponding to the
status bits of the Status Byte. Unused bits are cleared.
The SRE Register is used for calculating the MSS and RQS flags.
Parallel Poll Enable Register - set with *PRE, read with
*PRE?
0 0
ESB
MAV
Comm.
T.O.
PRIM
ERR
0 SRQ
IS
The Parallel Poll Enable Register has mask bits at positions corresponding to the status
bits of the Status Byte. Unused bits are cleared.
The PRE Register is used for calculating the IEEE 488.1 IST (Individual Status) message
(as read by the Remote Controller during a Parallel Poll).
74
XMP 2600 Programming Manual
rev. 1.1
