5.9 Operation via RS232 Interface
774 Oven Sample Processor, Instructions for use
101
5.9 Operation via RS232 Interface
5.9.1 General rules
The 774 Oven Sample Processor has an extensive remote control facility
that allows full control of the Sample Changer via the RS232 interface, i.e.
the Sample Changer can receive data from an external controller or send
data to an external controller. CR and LF are used as terminators for the
data transfer. The Sample Changer sends 2xCR and LF as termination of a
data block, to differentiate between a data line which has CR and LF as ter-
minators. The controller terminates its commands with CR and LF. If more
than one command per line is sent by the controller, ";" is used as a separa-
tor between the individual commands.
The data are grouped logically and easy to understand. Thus e.g., for the
selection of the dialog language, the following must be sent
&
C
onfig.
A
ux.
L
anguage
"english"
whereby it is sufficient to only transmit the boldface characters, thus:
&
C
.
A
.
L
"english"
The quantities of the commands above are:
C
onfig configuration
data
A
ux
auxiliaries, various data
L
anguage
setting the dialog language
The data are hierarchically structured (tree form). The quantities that occur
in this tree are called
objects
in the following. The dialog language is an
object which can be called up with the
&
C
onfig.
A
ux.
L
anguage
command.
If one is in the desired location in the tree, the value of the object can be
queried.
&
C
onfig.
A
ux.
L
anguage
$Q
Q for Query
The query command $Q initiates the issuing of the value on the instrument
and the value emission is triggered. Entries which start with $, trigger some-
thing. They are thus called
triggers
.
Values of objects can not only be queried, they can also be modified. Val-
ues are always entered in quotes, for example:
&
C
onfig.
A
ux.
L
anguage
"english"
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