VISA-VXI Communication and Trigger Parameters

• Adaptor
• Communication Address
• Termination
• Triggering

Adaptor
You can create a VISA-VXI object that uses the VISA standard as implemented by Agilent Technologies or National Instruments.

Communication Address
Each VXI instrument must have a unique chassis index and logical address.

• Chassis Index - Specify the index number of the VXI chassis
• Logical Address - Specify the instrument's logical address.

Termination
The following parameters are associated with completing read and write operations.

• EOSMode - Specify when the End-Of-String (EOS) character is used.
  • none - The EOS character is ignored.
  • read - The EOS character is used to complete read operations.
  • write - The EOS character is included with each write operation. When the EOS character is received by the instrument, its EOI line is asserted.
  • read&write - The EOS character is used for both read and write operations.
• EOSCharCode - Specify the EOS character. The value can range from 0 to 255, which represents the ASCII code for the character. For example, 13 represents a carriage return, while 10 represents a line feed. EOSCharCode replaces \n wherever it appears in the command sent to the instrument.
• EOIMode - Specify if the End-Or-Identify (EOI) line is asserted at the end of a write operation. The choices are:
  • Assert the EOI line
  • Don't assert the EOI line

Triggering
Select the parameters associated with sending a trigger message to the instrument. You execute a trigger using the TRIGGER command.

• TriggerType - Specify the trigger type to be software or hardware. For software triggers, the Word Serial Trigger command is sent to the instrument. For hardware triggers, the trigger is sent on the hardware line specified by TriggerLine.
• TriggerLine - Specify the trigger line used for hardware triggers.