B&K Precision 4034 - Manual - Manual (Page 37)

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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 pulse generator:
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.
4.5 Message Exchange Protocol
The device decodes messages using the Message Exchange Protocol (MEP) defined in IEEE 488.2. The following
functions implemented in the MEP must be considered: