3-7
IM DLM4038-17EN
GP-IB Interface (Option)
1
2
3
4
5
6
App
Index
Multi-line Messages
Multi-line messages are sent over eight data lines. The messages are grouped as follows:
• Address Commands
Address commands are valid when the DLM4000 is designated as a listener or 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
Universal commands are available to all devices 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.
Interface messages
Uni-line
messages
Address
commands
Universal
commands
*IFC
*REN
IDY
*GTL
*SDC
PPC
GET
TCT
*LLO
*DCL
PPU
*SPE
*SPD
Listener
address
Talker
address
Secondary
command
Multi-line messages
The DLM4000 supports interface messages marked with a
*
.
Note
Difference 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. Therefore, the SDC command affects a specific
device while the DCL command affects all devices on the bus.
3.6 Responses to Interface Messages
