Interface Functions - HP 7470A Interfacing And Programming Manual

Interface Functions
Interface functions provide the physical capability, to communicate via
HP-IB. These functions are defined in the ANSI/IEEE 488-1978
Standard. This standard, which is the designer's guide to the bus,
defines each interface function in terms of state diagrams that express
all possible interactions.
Bus capability is grouped under 10 interface functions, for example:
Talker, Listener, Controller, Remote/ Local. The following table lists the
functions, including two special cases of Controller.
HP—IB Interface Functions
Mnemonic Interface Function Name
SH Source Handshake
AH Acceptor Handshake
T Talker (or TE = Extended Talker)*
L Listener (or LE = Extended Listener)*
SR Service Request
RL Remote Local
PP Parallel Poll
DC Device Clear
DT Device Trigger
C Any Controller
CN A Specific Controller (for example: CA, CB . . .)
CS The System Controller
*Extended Talkers and Listeners use a two-byte address. Otherwise, they are
the same as Talker and Listener.
AN HP-IB OVERVIEW A-7