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GPIB Protocol Compatibility:

Bus Isolation:

Signal Propagation Delay:

External Indicators?

CE / FCC Certified?

Help with GPIB Expanders and GPIB Isolators specifications:

GPIB Protocol Compatibility
   GPIB Protocol Compatibility:       
   Your choices are...         
   IEEE 488.1       Devices are compatible with ANSI/IEEE Standard 488-1975, more commonly known as IEEE 488.1. This standard defines the mechanical, electrical, and protocol specifications for the interconnection of programmable instruments. IEEE 488.1 also specifies that a GPIB network supports a maximum of 14 devices on the bus and a maximum data transfer rate of 1-MBps. 
   IEEE 488.2       Devices are compatible with IEEE 488.2, an enhanced version of the original IEEE 488.1 Standard. Because IEEE 488.1 did not specify issues such as how data should be formatted, how the status of the bus should be reported, and how messages should be exchanged, Tektronix proposed a set of standard formats that became the basis of IEEE 488.2.  Specifically, IEEE 488.2 standardizes data formats, status reporting, error handling, and controller commands. 
   HS488       High Speed 488 (HS488) is a newer, faster protocol developed by National Instruments that accelerates data transfer rates up to 8-MBps using standard GPIB cables. HS488 is a superset of the original IEEE 488.1 standard implemented at the hardware level by an application-specific integrated circuit (ASIC).  
   Search Logic:      All products with ANY of the selected attributes will be returned as matches. Leaving all boxes unchecked will not limit the search criteria for this question; products with all attribute options will be returned as matches.
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Isolation
   Bus Isolation       Bus isolation is the isolation voltage that the expander provides to separate two GPIB ports electrically. Isolation voltage is important in applications where there are sensitive instruments on one side of the expander and noisy devices on the other.  
   Search Logic:      All matching products will have a value greater than or equal to the specified value.
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Other Features
   Signal Propagation Delay       Signal propagation delay is the speed degradation (time delay) that occurs when a signal is transferred between GPIB networks via an expander. 
   Search Logic:      All matching products will have a value less than or equal to the specified value.
   External Indicators?       Devices include external indicators (normally LEDs) for states such as Talk, Listen, Receive, Send, Power, Ready, etc. 
   Search Logic:      "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.
   CE / FCC Certified?       Devices meet requirements of the European Union's CE Marking system and/or the U.S. Federal Communications Commission (FCC). 
   Search Logic:      "Required" and "Must Not Have" criteria limit returned matches as specified. Products with optional attributes will be returned for either choice.
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