Interface Functions - HP 1630A Operating And Programming Manual

Model 1630A/D/G
An HP-113 Overview
Code used when attention (ATN) is true (low) .
X = don't care
INTERFACE FUNCTIONS
Command and Address Codes
Interface functions provide the physical capability to communicate via HP-113 . 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-113 Interface Functions
"Extended Talkers and Listeners use a two-byte address .
Otherwise, they are the same as Talker and Listener .
Code Form
Meaning
X 0 1 A5 A4
A3 A2 Al
Universal Commands
X 0 1
A5 A4 A3 A2 A'
Listen Addresses
except
X 0 1
1 1 1 1 1
Unlisten Command
X 1 0
A5 A4 A3 A2 A1
Talk Address
except
X 1 0
1 1 1 1 1
Untalk Command
X 1 1 A5 A4 A3
A2 Al
Secondary Commands
except
X 1 1
1 1 1 1 1 Ignored
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