2000I & 2000M Instrument’s User Guide, Revision B
78
Bus Commands
As previously mentioned, the IEEE488 interface can perform many tasks that the
RS232 does not; those used by the 2000 instrument are as follows:
1.
Remote/Local Selection. This has been previously described.
2.
Device Clear capabilities. The IEEE488 defined Device Clear functions (both
selective and global) force the 2000 to perform a power-on reset function.
3.
Serial Poll capabilities. The IEEE488 defined serial poll capabilities of the
2000 correspond to the requirements of the IEEE488 standard, the response
byte transmitted by the 2000 consisting of 2 bits of information, the remain-
ing 6 bits all being returned as logical 0. The next to most significant bit (with
a decimal equivalence of 64) is set if the 2000 instrument is actively asserting
the IEEE488 SRQ line, and the least significant bit (with a decimal equiva-
lence of 1) is set if the 2000 has completed actioning the previously received
command string
4.
Interface Clear capabilities. The IEEE488 standard defines this command,
which causes the interface portion of the 2000 instrument to be reset to the
power on conditions, aborting any bus activity in progress.
5.
Parallel Poll capabilities. The 2000 instrument does not have any Parallel poll
capabilities.
Other IEEE488 Specific Items
Should a handshake sequence be improperly completed during a transfer of data
to or from the 2000 interface, and then the 2000 instrument will automatically
perform a power on reset sequence. This facility prevents the interface becoming
locked out should the interface cable be removed or become faulty during a data
transfer.
Also note that the 2000 instrument offers the facility of changing the IEEE488
address via the front panel or via the interface. To protect the interface from en-
tering an undefined state when this occurs, the 2000 instrument will automatically
perform a power on reset sequence when this occurs.
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...
