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10.4 Command Formats and Responses
Commands to the LBA-PC will not normally generate a response back to the host controller, unless the
command:
• Changes remote/local mode
• Is a query
• Initiates an operation that produces results
• Generates an error
10.4.1 IEEE 488.1 Command Support
The LBA-PC in combination with an appropriate National Instruments GPIB board conforms to the
IEEE 488.1 standard according to the following Subset Codes:
SH1, AH1, T6, L4, SR1, RL2, PP0, DC1, DT0, E2, C0
These Subset Codes are defined in the IEEE 488.1 standard and describe interface capabilities of the
LBA-PC.
The following multiple line interface message commands are supported by the LBA-PC:
GTL - Go To Local (0x01). When the LBA-PC detects the GTL message it returns
to local command mode.
LLO - Local Lockout (0x11). When the LBA-PC detects the LLO message it enters
what is called the lockout state. This is equivalent to entering the operator
password in the Options | Password menu item. While in the lockout state
access is denied to many of the LBA-PC menu items. When the LBA-PC
exits the lockout state access to all menu items is restored.
MLA - My Listen Address (0x20 to 0x3e).
MSA - My Secondary Address (0x60 to 0x7e).
MTA - My Talk Address (0x40 to 0x5e).
PPC - Parallel Poll Configure (0x05). Handled by GPIB board and NI-488.2M.
PPD - Parallel Poll Disable (0x70 to 0x7e). Handled by GPIB board and NI-
488.2M.
PPE - Parallel Poll Disable (0x60 to 0x6e). Handled by GPIB board and NI-
488.2M.
PPU - Parallel Poll Unconfigure (0x15). Handled by GPIB board and NI-488.2M.
SPD - Serial Poll Disable (0x19).
SPE - Serial Poll Enable (0x18).
UN - Unlisten (0x3f).
UNT - Untalk (0x5f).
Operator’s Manual LBA-PC
Doc. No. 10654-001, Rev 4.10
179
The following IEEE 488.1 commands are not supported: