Enabling The Status Byte - Keysight E4980A User Manual

Overview of Remote Control
Status Byte

Enabling the Status Byte

A service request (SRQ) will be generated when any enabled bit in the status
byte register is set to "1." Therefore, to enable/disable any bits of the status
byte register, you can set bits in the service request enable register. These bits
correspond to bits in the status byte register. When a bit is set in the service
request enable register, it enables that bit in the status byte register to request
service. To set bits in the service request enable register, the *SRE command is
used. The syntax of the *SRE command is:
*SRE <n>
Where,
For example, 
If <n> is equal to 160 (10100000 in binary notation), bits 5 and 7 are enabled as
follows.
Bit No. of Status Byte
Bit Pattern for *SRE command
In this case, when either bit 5 or bit 7 of the status byte is set to "1," a service
request is generated.
The default setting is *SRE 0 (all bits of the status byte are disabled).
Bit 6 (RQS) is non-maskable, and bits 0 to 3 are always 0 (zero). Thus, it is
meaningless to mask these bits. (The *SRE command's bit pattern for
masking bit 6 is ignored, while the *SRE command's bit pattern for
masking bits 0 to 6 is accepted, but is meaningless.)
268
<n>: decimal number (0 to 255)
MSB LSB
7 6 5 4 3 2 1 0
1 0 1 0 0 0 0 0
Keysight E4980A/AL Precision LCR Meter