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IM WT3001E-17EN
Multi-Line Messages
Eight data lines are used to transmit multi-line messages. The messages are classified
as follows:
• Address Commands
These commands are valid when the instrument is designated as a listener or as a
talker. The following five types are available.
• Commands that are valid on an instrument that is designated as a listener
• GTL (Go To Local)
• SDC (Selected Device Clear)
• PPC (Parallel Poll Configure)
• GET (Group Execute Trigger)
• Commands that are valid on an instrument that is designated as a talker
TCT (Take Control)
• Universal Commands
These commands are valid on all instruments regardless of the listener and talker
designations. The following five types are available.
• LLO (Local Lockout)
• DCL (Device Clear)
• PPU (Parallel Poll Unconfigure)
• SPE (Serial Poll Enable)
• SPD (Serial Poll Disable)
In addition, listener address, talker address, and secondary commands are also
considered interface messages.
Uni-line
messages
*IFC
*REN
IDY
Listener
address
Interface messages that this instrument supports are indicated with * marks.
Note
The differences between SDC and DCL
In multi-line messages, SDC messages are those that require talker or listener designation
and DCL messages are those that do not require the designation.yTherefore, SDC messages
are directed at a particular instrument while DCL messages are directed at all instruments on
the bus.
1.6 Responses to Interface Messages
Interface messages
Multi-line messages
Address
commands
*GTL
*SDC
PPC
*GET
TCT
Talker
Secondary
address
commands
Universal
commands
*LLO
*DCL
PPU
*SPE
*SPD
1-7
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App
Index
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