Model 2651A High Power System SourceMeter® Instrument Reference Manual Section 2: General operation
2651A-901-01 Rev. A / March 2011 2-73
Communications interfaces
Selecting an interface
The Keithley Instruments Model 2651A High Power System SourceMeter
®
Instrument supports three
remote interfaces:
• GPIB (general purpose interface bus)
• RS-232
• LAN
NOTE
This section contains information on the GPIB connection (IEEE-488), Ethernet connection (LAN),
and Serial (RS-232) communications interfaces. See LAN concepts and settings (on page C-1) for
more information on LAN interfaces.
The Model 2651A can only be controlled from one remote interface at a time. The unit will remote to
the first interface on which it receives a message. It will ignore the other interface until the unit is
taken back to local operation.
Figure 26: Model 2651A IEEE-488, LAN, and RS-232 connections
!
LINE RATING
100-240 VAC
50, 60 Hz
500VA MAX.
LINE FUSE
SLOWBLOW
5.0 A, 250 V
WARNI
RS-232
DIGITAL I/O
LAN
IEEE-488
!
2
3
1
(1) IEEE-488 connection
(2) LAN connection
(3) RS-232 connection
Output queue
All interfaces share the same output queue. The output queue sets the message available (MAV) bits
in the status model. The data in the output queue clears if the mode changes to local mode.
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