Bus Messages - HP 7470A Interfacing And Programming Manual

Bus Messages
Since interface functions are the physical agency through which bus
messages are implemented, each device must implement one or more
functions to enable it to send or receive a given bus message.
The following table lists the functions required to implement each bus
message. Each device's operating manual lists the functions imple
mented by that device. Some devices, such as the 98034AInterface, list
the functions implemented directly on the device.
Functions Used by Each Bus Message
Bus Message
sender function —~ receiver function(s)
Functions Required
(support functions)
Data
Trigger
Clear
Remote
Local
Local Lockout
Require Service
Status Byte
Status Bit
Pass Control
Abort
Clear Lockout/ Set Local
T ~ L* (SH, AH)
C ~ DT* (L, SH, AH)
C ~ DC* (L, SH, AH)
CS—~ RL* (SH, AH)
C ~ RL* (L, SH, AH)
C ~ RL* (SH, AH)
CS "' RL*
SR* —~C
T - L* (SH, AH)
PP*-'C
cA~ CB (T, SH, AH)
CS—~T,L
*0
*Since more than one device can receive (or send) this message simultaneously,
each device must have the function indicated by an * .
A-8 AN HP-IB OVERVIEW