3-6
IM DLM4038-17EN
3.6 Responses to Interface Messages
Responses to Interface Messages
Responses to Uni-Line Messages
• IFC (Interface Clear)
Clears the talker and listener functions. Stops data transmission if it is in progress.
• REN (Remote Enable)
Switches between Remote and Local modes.
IDY (Identify) is not supported.
Responses to Multi-Line Messages (Address commands)
• GTL (Go To Local)
Switches to Local mode.
• SDC (Selected Device Clear)
• Clears the program message (command) being received and the output queue (see page 6-6
for details).
• Discards
*OPC
and
*OPC?
commands that are being executed.
• Immediately aborts
*WAI
and
COMMunicate:WAIT
.
PPC (Parallel Poll Configure), GET (Group Execute Trigger), and TCT (Take Control) are not
supported.
Responses to Multi-Line Messages (Universal commands)
• LLO (Local Lockout)
Disables the
SHIFT+CLEAR TRACE
key on the front panel to prohibit switching to the local
mode.
• DCL (Device Clear)
Performs the same operation as SDC.
• SPE (Serial Poll Enable)
Sets the talker function on all devices on the bus to serial poll mode. The controller will poll each
device in order.
• SPD (Serial Poll Disable)
Clears the talker function’s serial poll mode on all devices on the bus.
PPU (Parallel Poll Unconfigure) is not supported.
What Are Interface Messages?
Interface messages are commands that a controller transmits. They are also referred to as interface
commands or bus commands. They are classified as follows:
Uni-line Messages
Uni-line messages are sent over a single control line. The following three messages are available.
• IFC (Interface Clear)
• REN (Remote Enable)
• IDY (Identify)
