Chapter 2 Definition of terms
2-1
Chapter 2 Definition of terms
This chapter describes the communication terms used in this user’s manual.
1) Communication type
A) Simplex
This is the communication type that data is transferred in constant direction. Information can not be
transferred in the reverse direction.
B) Half-Duplex
Data is transferred in two-way with one cable if time interval provided, though it can’t be transferred
simultaneously.
C) Full-Duplex
Data is simultaneously transferred and received in two-way with two cables.
2) Transmission type
This is divided into the following 2 types in consideration of the speed, safety and economy on transmission in
binary (bit composed of 0 and 1).
A) Serial transmission
This type transmits bit by bit via 1 cable. The speed of transmission is slow, but the cost of installation is low
and the software is simplified.
RS-232C, RS-422 and RS-485 are the examples.
Trans.
Recv.
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