Anritsu ML2437A - Using 488.1 GPIB

GPIB Operation Using 488.1 GPIB
ML2437A/38A OM/PM PN: 10585-00001 Rev. P 8-5
8-4 Using 488.1 GPIB
IEEE 488.1 level commands are in the form of data byte codes with the attention (ATN) line
set. A separate function is normally provided to drive these commands from a GPIB program.
A typical GPIB driver library call for 488.1 and 488.2 is given for each of the following
commands. Refer to the IEEE 488.1 and IEEE488.2 device driver manuals for full definitions
of the responses, and to find the actual command format for your GPIB driver library.
Device Clear (DCL) and Selected Device Clear (SDC)
These commands clear the GPIB device interface and have the following effects:
• All buffered messages waiting to be processed are cleared.
• All buffered data waiting to be read from the device is cleared.
• Stop any pending actions.
For example, if a request for data has been sent, and the system is waiting for the reading to
be triggered, the system would wait until the reading has been provided before any further
GPIB commands can be processed. The device clear will clear the data request so further
GPIB commands after the device clear has completed can be actioned.
Typical device library calls are 488.1 'ibclr' and 488.2 'DevClear'.
Device trigger (GET)
This command triggers a GPIB device. An action predefined by the setup of the device being
triggered will take place. On the ML243xA, the device trigger provides a trigger of the type
defined by the GTn commands previously sent and a reading put into the output buffer for
each display channel that is not OFF. In Profile mode, the profile display for the selected
channel only is output. Typical device library calls are 488.1 'ibtrg' and 488.2 'Trigger'.
Goto local (GTL)
This command forces the device out of remote mode and into local operation mode. The local
operation keys and menus are now available.
Typical device library calls are 488.1 'ibloc' and 488.2 'EnableLocal'.
Interface clear (IFC)
This is part of the GPIB initialization and forces the board to the controller in charge. Typical
device library calls are 488.1 'ibsic' and 488.2 'SendIFC'.
Local lockout (LLO)
Sends the local lockout to all devices. The local lockout disables the 'LOCAL' key on all the
devices.
Typical device library calls are 488.1 'ibconfig' plus correct option and 488.2 'SendLLO'.
Serial poll
This command will clear any SRQs and read the status byte of the device.
Typical device library calls are 488.1 'ibrsp' and 488.2 'ReadStatusByte'.