Agilent Technologies 8156A 7.2 Setting the GPIB Address , 7.3 Returning the Instrument to Local Control , 7.4 How the Attenuator Receives and Transmits Messages

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Programming the Attenuator
Setting the GPIB Address
7.2 Setting the GPIB Address
You can only set the GPIB address from the front panel. See
“Setting the GPIB Address” on page 67.
The default GPIB address is 28.
7.3 Returning the Instrument to Local Control
If the instr ument has been operated in remote th e only k eys yo u can
use are Locala and ENB/DIS. The Local key returns the instrument
to local control. Local does not operate if local lockout has been
enabled. ENB/DIS enables and disables the output from the
attenuator. ENB/DIS does not operate if SHUTTER is set to
LOCKOUT (see “Locking Out Enb/Dis ” on page 72).
7.4 How the Attenuator Receives and Transmits
Messages
The attenuator exchanges messages using an input and an output
queue. Error messages are kept in a separate error queue.
How the Input Queue Works
The input queue is a FIFO queue (first-in firs t-out). Incoming b ytes
are stored in the input queue as follows:
1. Receiving a byte:
a. Clears the output queue.