Symbols Used In Syntax Descriptions; Messages - YOKOGAWA WT110 User Manual

Appendix 2.2 Program Format
Appendix 2.2 Program Format
2.2.1 Symbols Used in Syntax
Descriptions
Symbols which are used in the syntax descriptions in
Appendix 2.3 are shown below. These symbols are referred to
as BNF notation (Backus-Naur Form). For detailed
information, refer to pages App2-6 to App2-7.
Symbol Description Example
< > Defined value
CHANnel<x> <x>=1, 2
{} One of the options in
MODE {AND|OR}
{} is selected.
| Exclusive OR
MODE {AND|OR}
[ ] Abbreviated
:MEASure[:MODE] {<NRf>}
... may be repeated
App2-2
2.2.2

Messages

Blocks of message data are transferred between the controller
and this instrument during communications. Messages sent
from the controller to this instrument are called program
messages, and messages sent back from this instrument to the
controller are called response messages.
If a program message contains a query command, i.e. a
Example
command which requests a response, this instrument returns a
CHANNEL2
response message. A single response message is always
MODE AND
returned in reply to a program message.
MODE AND
Program Messages
As explained above, the data (message) sent from the
controller to this instrument is called a program message. The
format of a program message is shown below.
<Program message unit>
A program message consists of zero or more program message
units; each unit corresponds to one command. This instrument
executes commands one by one according to the order in
which they are received.
Program message units are delimited by a ";".
For a description of the format of the program message unit,
refer to the explanation given further below.
Example :CONFIGURE:MODE RMS;FILTER ON<PMT>
<PMT>
PMT is a terminator used to terminate each program message.
The following three types of terminator are available.
NL (New Line) : Same as LF (Line Feed). ASCII code
^END
NL^END
;
Program message unit
Unit Unit
"0AH" is used.
: END message defined in IEEE488.1. (EOI
signal)
(The data byte sent with an END message
will be the final item of the program
message unit.)
: NL with an END message attached
(NL is not included in the program
message unit.)
<PMT>
IM 253401-01E