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A1
A1
VXI-11 Introduction
The VXI-11 Standard was created as a way to control instruments over a TCP/IP
network. VXI-11 is the overall VXI-11 document and describes the network
protocol. There are three sub-standards. VXI-11.1 is for a VXI chassis. The
VXI-11.2 Standard is for an GPIB Instrument Gateway like ICS's Model 8065
or 9065 Ethernet-to-GPIB Controller. VXI-11.3 describes the control of LAN
instruments and applies to ICS's 80xx and 90xx series Interfaces.
The VXI-11 protocol is based on the familiar IEEE-488 Standards and provides
most of the command and functional capabilities found in a traditional GPIB
instrument or system. VXI-11 commands include such familiar GPIB tasks as
writing commands to or reading responses from an instrument, Selected De-
vice Clear. Device Trigger (GET), set Remote or Local state (GTL), and Read
Status Byte (Serial Poll). VXI-11 device command messages are similar to
IEEE-488.2 messages in that can have a user embedded terminating character
(linefeed) added to the end of the message and an End flag that can be asserted
on the last character of the message. VXI-11 responses also adhere to the IEEE-
488.2 Standard. ICS's 80xx series Interfaces follow all of the requirements in
IEEE 488.2 Standard except where the difference between the TCP/IP-IEEE
488.2 Instrument Interface and IEEE 488.1 requires clarification. ICS's 80xx
Interfaces also include an IEEE-488.2 Status Reporting Structure and SCPI
Command Parser that are similar to those in ICS's GPIB Interfaces.
A1.1 IEEE 488.1 bUS
The IEEE Std 488 Bus, or GPIB as it is commonly referred to, provided a
means of transferring data and commands between devices. The physical
portion of the bus is not relevant to a VXI-11.3 Instrument but the message
concepts are pertinent.
A.1.1.1 VXI-11 Relationship to IEEE-488.1
VXI-11.2 Gateways and VXI-11.3 Instruments are servers and respond to VXI-
11 Remote Procedure Calls (RPCs) from the client application (program). The
device_write and the device_read RPCs transfer Device-dependent messages
which are used for device control and data transfer. Examples are IEEE-
488.2 Common Commands, SCPI commands and other device dependent
messages.
VXI-11.3 Instruments may act like talkers or listeners. A talker sends device
dependent messages, i.e., data, status. A listener accepts interface messages,
bus commands and device-dependent messages, i.e., setup commands,
data.
Summary of Contents for 9099
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