HP 83751A Programming Manual page 221

Interface Function Codes
Acceptor Handshake-full capability
Basic Talker- Serial Poll capability
Basic Listener- Unaddressed if MLA
Service Request-full capability
Remote Local-complete capability
Parallel Poll-no capability
Device Clear-full capability
Device Trigger-full capability
Controller- no capability
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Source Handshake-full capability
Driver Electronics-open collector
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