Chapter 4 RS-232C communications
4.1 Cautions before use
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Chapter 4
RS-232C communications
This chapter describes the use of RS-232C communications and its
communication commands.
4.1
Cautions before use
Use caution regarding the following points, when using RS-232C
communications.
・
Use the following designated cable for connecting to the computer.
Part name: PC cable for 50 Series
Part number: 9096004800
・
Make sure that the data transfer formats for the meter and
computer match. The following data transfer format is used by the
meter.
Baud rate: 2400 bps
Character length: 8 bits
Parity: None
Stop bits: 1
If the data transfer formats differ, communications errors may occur or the on-
line mode may not start up, and RS-232C communications cannot proceed
normally. If the transfer format is changed, turn the power to both the pH meter
and the computer OFF, and then ON again.
・
When creating a program for RS-232C, put the meter in the ON-
LINE mode by entering
an
on-line
command
at
the
beginning
of
the
program. The control switches become invalid when the meter is in
the ON-LINE mode, and the RS-232C Communications mode is
enabled LOCK is displayed.
The
ON-LINE
mode
is
cleared
when
the power is turned OFF.
・
If data is requested but not received, create the program structure
to have the data request repeated after a short waiting time. This
will provide more reliable communications.
・
If RS-232C communications is not used, cover the RS-232C port
with a rubber cap.
・
This system does not carry out control using DCD, CTS or DSR.
Note this point when creating a program.
