Interface Operation
77
Remote/Local Operation
The IEEE488 interface defines separate “REMOTE”
and “LOCAL” states. While
in the LOCAL
state, which is following the initial application of power, the in-
strument will only respond to commands from the instrument’s front panel. Plac-
ing the instrument in the “REMOTE”
state by way of the defined interface
command, the instrument will only respond to commands received via the inter-
face or until released into the “LOCAL”
state by the defined interface command.
In either state, the instrument’s present status can be read by the interface.
If the instrument is in the ‘REMOTE”
state and “LOCAL LOCKOUT”
has not
been commanded, then press the MNU key to return the instrument to the “LO-
CAL”
state.
Address Selection
When the 2000-IE-BAT option is fitted, an additional item is available from the
MNU
key; this is the selection of the interface address. This is accessed by press-
ing the MNU
key on the front panel. The last menu selection (press either the
MNU
key or any of the arrow
keys until this selection is displayed) will be the
prompt to change the IEEE488 address, if this is selected (by pressing any of the
Units/Enter keys) then the present address will be displayed and the user may
enter a new address by pressing the arrow
keys until the desired address is shown.
Press any of the Units/Enter keys to select the displayed address or press the
MNU key to abort the entry.
IEEE488 Handshake Lines
All the timing requirements of the bus interface are handled by the hardware
handshake system used by the IEEE488 interface. During decode of a command
all further received data are held-off by this hardware handshake until the decode
has been completed. If you want to synchronize the activities of the controller and
the 2000 instrument in this respect, then use the
SRQ
capabilities of the 2000
instrument. Additionally note that a two-second delay is forced between sending
a Device Clear (either DCL or SDQ bus command) and sending data to the 2000
instrument.
Summary of Contents for Xitron 2000 Series
Page 1: ...USER GUIDE 2000 Family DC Temperature Source Instruments...
Page 2: ......
Page 18: ...2000I 2000M Instrument s User Guide Revision B 18...
Page 42: ...2000I 2000M Instrument s User Guide Revision B 42...
Page 47: ...Using the Memory Options 47...
Page 60: ...2000I 2000M Instrument s User Guide Revision B 60...
Page 91: ......
Page 92: ...2000I 2000M Instrument s User Guide Revision B 92...
Page 95: ...Appendix B General Specifications 95...
Page 97: ...Password Page 97...
