© National Instruments Corp.
B-1
GPIB-140 User Manual
Appendix B
Specifications
This appendix lists the specifications of the GPIB extender.
Table B-1. System Configuration
Configuration
Specification
Distance per GPIB-140 extension
Up to 1 km
Distance per GPIB-140/2 extension
Up to 2 km
Loading per extension
Up to 13 additional devices (28 total devices in
the extension system, including the extenders)
Multiple extensions
Permitted in any combination of star or linear
pattern
Table B-2. Performance Characteristics
Characteristic
Specification
Maximum transfer rate
Buffered mode, non-HS488
HS488 handshake
Unbuffered mode
1.05 Mbytes/s
2.2 Mbytes/s
200 kbytes/s
Functionality
Transparent GPIB operation except for latched
parallel polls
Interlocked IEEE 488 handshake
Maintained across the extension 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
HS488 capability identification
codes
SHE
HS488 Source Handshake
AHE
HS488 Acceptor Handshake