Chapter 2 Before use
2-8
2.5 Message Format
Messages are composed of character strings for executing commands and
character strings indicating the message end. When sending messages to
this instrument, terminate the line with CR/LF; received messages are
terminated with CR/LF.
Messages are composed of the following types:
Program Messages:
Messages sent from PC to instrument
These are composed of commands to set the instrument and queries
requesting sending of a response message.
Response Messages:
Messages sent from instrument to PC controller
These messages are composed of header and data parts separated by a
white space. Program messages must have an appended header but may
not include data. Response messages must have appended data but may
not include a header.
In this manual, white space is written as <wsp> in command syntax
description.
The header is composed of alphanumeric characters and underbars while
the head string is alphabetic characters. However, common commands
defined by IEEE 488.2 have an asterisk (*) appended to the header string.
Both upper and lower-case alphabetic characters are supported.
Command with only header:
*RST
*CLS
INITiate:AUTo
Command with header and data:
*ESE 255
SOURce:WAVelength 1310
INSTrument:SELect OTDR_STD
Messages with multiple data use commas (,) to separate the data parts.
Example:
SENSe:LSALeft 0.0, 10.0
SENS:ANAL:PAR 0.05, -60.0, 3.0
Queries have a question mark (?) appended to the header.
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