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Channel Interface
7942 and 7946
Table 2- 5. HP-IB Message Structure
HEADER
PRIMARY I
SECONDARY
[ATN]
[ATN]
[ONE BYTE]
[ONE BYTE]
--Unidirectional --Unidirectional
*CIC to device
*CIC to device
--Begins message
*Addresses
device to
LISTEN or
TALK
*Universal
2-14
--Set up device for
further action
TEXT
TRAILER
DEVICE COMMAND OR DATA
PRIMARY II
[ATN]
--Bidirectional
[ONE BYTE]
--Qualifying instructions --Unidirectional
to device
*CIC to device
--Write data to device
--Terminates
--Read data to CIC
message
--Status data to CIC
--Unaddresses
device
*Unlisten
*Untalk
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