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APPENDIX D
A serial polling technique must be used by the HP-IB controller to test for service
requests. The analyzer does not respond to HP-IB parallel polling.
The HP-IB controller response to a service request depends on the controller. The operating manuals for each
controller discuss that control&s reaction to setting the SRQ line true. Series 200 computers have a sequence of
commands which enable a response to a service request. These commands allow monitoring the SRQ line and
reading, interpreting, and then clearing the status byte. This sequence of commands and a subroutine, selected
according to the type of service request, form a service routine. A general setup is given below.
Specify iherface select code and label of subroutine
Enable interface card to interrupt
Enable SRO
NOTE
Computationlcontrol statements
Return to next line in Main Program
Read status byte
Interpret status byte
A p p e n d i x 3 3
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