HP 16501A LOGIC, Programmer'S Manual

Page: 96 / 252

LCL - remote to local
Indicates whether a remote to local transition has occurred.
MSB - module summary bit
Indicates that an enable event in one of the module Status registers has
occurred.
Key Features
A few of the most important features of Status Reporting are listed in the
following paragraphs.
Operation Complete
The IEEE 488.2 structure provides one technique that can be used to find
out if any operation is finished. The
*OPC command, when sent to the
instrument after the operation of interest, will set the OPC bit in the
Standard Event Status Register. If the OPC bit and the RQS bit have been
enabled, a service request will be generated. The commands that affect the
OPC bit are the overlapped commands.
Example
OUTPUT XXX;"*SRE 32 ; *ESE 1" !enables an OPC service
request
Status Byte
The Status Byte contains the basic status information which is sent over the
bus in a serial poll. If the device is requesting service (RQS set), and the
controller serial-polls the device, the RQS bit is cleared. The MSS (Master
Summary Status) bit (read with
*STB?
) ) and other bits of the Status Byte are
not be cleared by reading them. Only the RQS bit is cleared when read.
The Status Byte is cleared with the *CLS common command.
Status Reporting
Key Features
7–6