Remote Control
Copyright © ITECH Electronic Co., Ltd. 7
1. Send the appropriate query command(s) in a program message.1.
2. Address the IT8800 Series to talk.
Rule 2.The complete response message must be received by the computer
before another program message can be sent to the IT8800 Series.
1.7 Message Type of SCPI
There are two types of SCPI messages, program and response.
Program message: A program message consists of one or more properly
formatted SCPI commands sent from the controller to the electronic load.
The message, which may be sent at any time, requests the electronic load
to perform some action.
Response message: A response message consists of data in a specific
SCPI format sent from the electronic load to the controller. The electronic
load sends the message only when commanded by a program message
called a "query."
The next figure illustrates SCPI message structure:
The Message Unit
The simplest SCPI command is a single message unit consisting of a command
header (or keyword) followed by a message terminator. The message unit may
include a parameter after the header. The parameter can be numeric or a
string.
VOLTage 20<NL>
Headers
Headers, also referred to as keywords, are instructions recognized by the
electronic load. Headers may be either in the long form or the short form. In the
long form, the header is completely spelled out, such as VOLTAGE, STATUS,
and DELAY. In the short form, the header has only the first three or four letters,
such as VOLT, STAT, and DEL.
Query Indicator
Following a header with a question mark turns it into a query (VOLTage?,
VOLTage:PROTection?). If a query contains a parameter, place the query
indicator at the end of the last header(VOLTage:PROTection?MAX).
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