HP 3336A - Page 57

APPENDIX A
Detailed Implementation of Bus Messages
3-A-1. Introduction.
Appendix A
3-A-2. This appendix contains technical descriptions of the implementation of the HP-IB
messages. Included at the end are two timing diagrams describing the handshake technique.
The figures that comprise this appendix are:
Message
Remote
Local
Local Lockout
Clear Lockout/Set Local
Clear
Data (send)
Data (receive)
Serial Poll (status byte)
Trigger
Require Service
Pass Control
Abort I/O
Handshake
Functional Diagram
Timing Relationship
3-A-3. Codes used in these figures are:
T = True
F = False
X = don’t care
Figure
3-A-1
3-A-2
3-A-3
3-A-4
3-A-5
3-A-6
3-A-7
3-A-8
3-A-9
3-A-10
3-A-11
3-A-12
3-A-13
3-A-14
The characters sent or received on the Data lines are ASCII. The logic on the HP-IB is low
true, floating high for false.
A-1