Program Format; Symbols Used In Syntax Descriptions; Messages - YOKOGAWA WT200 User Manual

14.2 Program Format

14.2.1 Symbols Used in Syntax
Descriptions
Symbols which are used in the syntax descriptions in
section 14.3 are shown below. These symbols are
referred to as BNF notation (Backus-Naur Form). For
detailed information, see pages 14-7 and 14-8.
Symbol Description Example
< > Defined value DISPLAY<x> <x>=1, 2
{} One of the options in MODE {RMS|VMEan|DC}
{} is selected.
MODE {RMS|VMEan|DC}
| Exclusive OR
[ ] Abbreviated
SCALing[:STATe] {<Boolean>}
... may be repeated
IM 253421-01E

14.2.2 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.
Example
If a program message contains a query command, i.e.
DISPLAY2
MODE RMS
a command which requests a response, this
instrument returns a response message. A single
MODE RMS
response message is always returned in reply to a
program message.
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
<Program message unit>
A program message consists of one or more program
message units; each unit corresponds to one
command. This instrument executes commbìts 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, see 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
"0AH" is used.
^END: 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^END: NL with an END message attached
(NL is not included in the program message unit.)
;
<PMT>
Unit Unit
14
14-3