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©
National Instruments Corporation
C-1
GPIB-120B User Manual
C
Specifications
This appendix lists the specifications and characteristics of the GPIB-120B
isolator/expander.
System Configuration
Loading per expansion ........................... Up to 14 additional devices
(28 total devices in the expansion
system, not including the
GPIB-120B on the bus.)
Multiple expansions ............................... Permitted in any combination of
star or linear pattern
Performance Characteristics
Maximum transfer rate
Buffered mode ................................ > 1.25 Mbytes/s
Unbuffered mode ............................ > 450 kbytes/s
Interlocked IEEE 488 handshake ........... Maintained across the expansion
in unbuffered mode
IEEE 488 capability identification codes
SH1 ................................................. Complete Source Handshake
AH1................................................. Complete Acceptor Handshake
T5, TE5 ........................................... Complete Talker
L3, LE3 ........................................... Complete Listener
SR1.................................................. Complete Service Request
RL1 ................................................. Complete Remote Local
PP1, 2 .............................................. Complete Parallel Poll
DC1 ................................................. Complete Device Clear
DT1 ................................................. Complete Device Trigger
C1–5................................................ Complete Controller
E2 .................................................... Tri-state GPIB driver