7. Input & Communication
RS232
An Electronic Industries Association (EIA) serial digital interface standard specifying the characteristics of t he commu-
nication path between two devices using either D-SUB 9 pins or D-SUB 25 pins connectors. This standard is used for
relatively short-range communications and do es no t specify balanced control lines. R S-232 is a se rial control s tandard
with a s et number of cond uctors, data rate, word length and type of connector to b e use d. The standard specifies com -
ponent connection standards with regard to c omputer interface. It is also c alled RS-232-C, which is the third version
of the RS -232 standard, and is functionally identical to the CCITT V.24 s tandard. Logical ’0’ is > + 3V, Logical ’1’ is < -
3V. The range between -3V and +3V is the transition zone.
46 R5977692 DP2K-S SERIES 10/12/2012
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