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• In a two-instrument system that uses just one HP-IB cable, the cable length must not exceed 4
metres (13 feet).
• When more than two instruments are connected on the bus, the cable length to each instrument
must not exceed 2 metres (6.5 feet) per unit.
• The total cable length between all units cannot exceed 20 metres (65 feet).
Hewlett-Packard manufactures HP-IB extender instruments (Models 37201A, 37203A/L) that over¬
come the range limitations imposed by the cabling rules. These extenders allow twin-pair cable
operation up to 1000 metres (3,280 feet), and telephone modem operation over any distance. HP
Sales and Service offices can provide additional information on HP-IB extenders.
The codes next to the HP-IB connector describe the HP-IB electrical capabilities of the HP 8340B/41B,
using IEEE Std 488-1978 mnemonics (HP-IB, GP-IB, IEEE-488, and IEC-625 are all electrically equiv¬
alent). Briefly, the mnemonics translate as follows:
SHI:
Source Handshake, complete capability.
AH1:
Acceptor Handshake, complete capability.
T6:
Talker; capable of basic talker, serial poll, and unaddress if MLA.
TEU: Talker, Extended address; no capability.
L4:
Listener, capable of basic listener, and unaddress if MTA.
LEO:
Listener, Extended address: no capability.
SRI:
Service Request, complete capability.
RL1:
Remote Local, complete capability.
PPO:
Parallel Poll, no capability.
DC1:
Device Clear, complete capability.
DTI:
Device Trigger, complete capability.
CO, 1, 2, 3, 28:
Controller capability options; CO, no capabilities; Cl system controller, C2, send
IFC and take charge; C3, send REN; C28, send I.F. messages.
El:
Electrical specification indicating open collector outputs.
These codes are completely in the IEEE Std 488-1978 document, published by The Institute of Elec¬
trical and Electronic Engineers, Inc., 345 East 47th Street, New York, New York 11017.
Figure 3-20.
HP-IB Connector (2 of 2)
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Operating Information
HP 8340B/41B
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