11713A Operating and Service Manual 6-5
Remote Operation
Receiving the Local Message
The driver does not respond to the local message. When the driver is in
Local Message remote mode, it can be returned to local mode with a
Clear Lockout/Set Local message.
The front panel LOCAL key can also return the driver to local mode.
However, pressing the LOCAL key might interrupt a data message to
the driver. This would leave the driver in a state unknown to the
controller. This situation would be undesirable and is avoided by
setting the Local Lockout condition which disables the LOCAL key.
Receiving the Local Lockout Message
The LOCAL pushbutton switch is disabled with Local Lockout in effect.
The driver is returned to local through program control by the
controller.
NOTE
The driver may also be returned to local by turning the driver LINE
switch off and then on, but this defeats the purpose of the Local Lockout
and the system controller loses control.
Receiving the Clear Lockout/Set Local Message
The system controller sends a Clear Lockout/Set Local message to clear
the Local Lockout condition and return all devices to local. No
instrument settings are changed when going from local lockout (remote
control) to local control.
Receiving the Pass Control Message
The driver does not respond to the Pass Control message because it
cannot act as a controller
Sending the Require Service Message
The driver cannot send a Require Service message.
Sending the Status Byte Message
The driver does not respond to a serial poll and as a result does not send
the Status Bit message.
Sending the Status Bit Message
Table 6-1 summarizes the driver’s GPIB capabilities in terms of the
twelve bus messages.
