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VX4380 256-Crosspoint Relay Matrix Module User Manual
3–11
Functional Command Groups
This section lists the VX4380 system and module commands.
System Commands
The following low-level commands are typically sent by the module’s command-
er, and are transparent to the user of the module. (An exception is the Read STB
command, which is sent whenever a Serial Poll on an IEEE-488 system is
performed.) Most commanders or Slot 0 devices have specific ASCII commands
that cause the commander to send one of these low-level commands to a
specified instrument. Refer to the operating manual of the commander or Slot 0
device for information on these commands.
Command Effect
Begin Normal Operation The module begins operation if it has not already done so.
Byte Available Transfers module commands to this module.
Byte Request Requests the module to return a byte of data from the output
queue.
Clear The module clears its VXIbus interface and any pending
commands. Current module operations are unaffected.
Clear Lock Clears the Lock bit of the Response register.
Read Protocol The module returns its protocol to its commander.
Read STB The module returns its VXI status byte to its commander.
Set Lock Set the Lock bit of the Response register.
Trigger Close the next relay in a scan list that has been defined by a
ROUTe:SCAN <channel_list> command. A VXI Trigger
command is enabled as a trigger source by a ROUTe:SE-
Quence:SOURce BUS command.
Module Commands
A summary of the VX4380-specific and IEEE-488.2 Common Commands is
listed in Tables 3–1 and 3–2 below. The next section, Command Descriptions,
includes detailed descriptions of each command. Appendix C: Examples shows
examples of command usage.