Metrohm 877 Titrino plus - Manual (Page 120)

10.7 Remote control via an RS-232 connection
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110 ￭￭￭￭￭￭￭￭
877 Titrino plus
Interface parameters
We recommend the following parameters for the RS-232 interface
COM2:
￭ Baud rate: 19200
￭ Data bits: 8
￭ Stop bits: 1
￭ Parity: none
￭ Handshake: software
On the 877 Titrino plus, adjust the interface parameters under
Menu
▶ System ▶ External devices ▶ COM2 settings.
Transfer protocol
The data communication is synchronous. On each command there is an
acknowledgement by the instrument.
A command must be sent to the instrument with the control characters
CR LF as terminator. The acknowledgements of the instrument will also
be transferred with CR LF as terminator.
The instrument does not send spontaneous messages.
10.7.1 Commands and variables
Command Function Comment
$G Start/Continue Corresponds to the key [START] or [Con-
tinue]
$S Stop Corresponds to the key [STOP]
$H Hold Hold the method run
$D Scan instrument sta-
tus Acknowledgements: Ready;0, Busy;0 or
Hold;0 (0 = no message)
If a message on the instrument requires
the interaction of the user, the acknowl-
edgement of the status scan displays the
corresponding message number. Exam-
ple:
Busy;010-119
= "Check buret unit"
The message can be confirmed with [OK]
or [Cancel], see below.