Responses To Interface Messages - YOKOGAWA TA220 User Manual

8.5

Responses to Interface Messages

Interface Messages
Interface messages are also called interface
commands or bus commands, and are commands
which are output from the controller. The following
categories of messages exist.
Uniline Messages
A message is sent using a single command line. The
following three types are available.
IFC (Interface Clear), REN (Remote Enable), and IDY
(Identify)
Multiline Messages
A message is sent using eight data lines. The
following categories exist.
• Address Commands
These commands are valid for the instruments set
to listener or talker. The following five types are
available.
• Commands available to instruments set to
listener
GTL (Go To Local), SDC (Selected Device
Clear), PPC (Parallel Poll Configure), and GET
(Group Execute Trigger)
• Commands available to instruments set to talker
TCT (Take Control)
• Universal Commands
These commands are valid on all instruments
regardless of the listener/talker designations. The
following five types are available.
LLO (Local Lockout), DCL (Device Clear), PPU
(Parallel Poll Unconfigure), SPE (Serial Poll
Enable), and SPD (Serial Poll Disable)
Other Interface Messages
Two commands are available, Listener and Talker.
Differences between SDC and DCL
Of the multi-line messages, SDC requires talker or
listener designation and DCL requires no such
designation. Therefore, SDC works only with specific
devices, but DCL works with all devices on the bus.
8-6
Responses to Interface Messages
Response to Uniline Messages
• IFC
Clears talker and listener. Stops any data that may
be being output.
• REN
Switches between remote and local status.
• IDY
Not supported.
Responses to Multiline Messages (Address
Commands)
• GTL
Switches to local status.
• SDC
• Clears the program message (command) being
received and the output queue (see section
10.3.5).
• The COMMunicate:WAIT command is
immediately terminated.
• GET
Same operation as the "*TRG" command.
• PPC, TCT
Not supported.
Responses to Multiline Messages (Universal
Commands)
• LLO
Disables LOCAL on the front panel to prohibit
switching to local mode.
• DCL
Performs the same action as SDC.
• SPE
Sets the talker function of all devices on the bus to
serial poll mode. The controller polls each
instrument in order.
• SPD
Clears serial poll mode for the talker function of all
devices on the bus.
• PPU
Not supported.
IM 704610-01E