YOKOGAWA WT1800 User Manual page 23

3.5 Responses to Interface Messages
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 commands are available.
Commands available to a device designated as a listener
• GTL (Go To Local)
• SDC (Selected Device Clear)
• PPC (Parallel Poll Configure)
• GET (Group Execute Trigger)
Commands available to a device designated as a talker
• TCT (Take Control)
• Universal Commands
These commands are valid on all instruments regardless of their listener or talker designation.
The following five commands are available.
• LLO (Local Lockout)
• DCL (Device Clear)
• PPU (Parallel Poll Unconfigure)
• SPE (Serial Poll Enable)
• SPD (Serial Poll Disable)
There are other interface messages: listener-address, talk-address, and secondary commands.
The WT1800 supports interface messages marked with a
Note
Difference between SDC and DCL
In multi-line messages, SDC messages are address commands that require talker or listener designation and
DCL messages are universal commands that do not require a designation. Therefore, SDC messages are
directed at a particular instrument while DCL messages are directed at all instruments on the bus.
3-8
Uni-line
messages
IFC
REN
IDY
Listener
address
Interface messages
Multi-line messages
Address
commands
GTL
SDC
PPC
GET
TCT
Talker
address
Universal
commands
LLO
DCL
PPU
SPE
SPD
Secondary
commands
.
IM WT1801-17EN