B&K Precision 4078 - Manual - Manual (Page 41)

The instrument accepts a carriage return (CR) as an end of string (EOS) terminator and sends both a CR and LF as
the EOS terminator.
4.2 Device State
The device may be in one of the four possible states described below. The transition between states is defined by
IEEE 488.1.
4.2.1 Local State (LOCS)
In the LOCS the device may be operated from the front panel only. Its settings may be queried over the GPIB, but
not changed. Commands that do not affect the signal being output by the instrument are accepted.
4.2.2 Local With Lockout State (LWLS)
In the LWLS the device may be operated from the front panel only. Its settings may be queried over the GPIB, but
not changed. Commands that do not affect the signal being output by the instrument are accepted. The difference
between the LOCS and the LWLS is that from the LWLS the device may enter the Remote With Lockout State.
4.2.3 Remote State (REMS)
In the REMS the device may be operated from the GPIB. Actuating any front panel key will cause the device state
to revert to the LOCS.
4.2.4 Remote With Lockout State (RWLS)
In the RWLS the device is operable only from the GPIB. Front panel operation may be returned by either sending an
appropriate IEEE 488.1 command, or by cycling the device power.
4.3 Interface Function Subsets
The following interface function subsets are implemented in the MODEL 4075 and 4078:
SH1, AH1, T6, L4, SR1, RL1, PP0, DC1, DT1, E2, C0
4.4 Device Address
The GPIB address of the device may be set to any value from 0 to 31. The address may be changed from the front
panel, using the numeric keypad or the rotary encoder, or via the GPIB itself using the command:
:SYSTem:COMMunicate:GPIB:ADDRess
Setting the device to address 31 puts it in the 'off-bus' state. In this state it will not respond to messages on the GPIB.
If the device is in the REMS when set to address 31, an internal 'return-to-local' command will be given, setting the
device to the LOCS. If the device is in the RWLS, the 'return-to-local' command is ignored, and the device remains
in the RWLS. The only way to then re-establish communication with the device over the GPIB is to cycle the power,
and to then change the address to that required from the front panel.