NAVI D-25 Instruction Manual page 111

4 RS-232C communications
4.1 Cautions before use
100
・ 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.
HORIBA