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2
3. Full-duplex telecommunication connection
between interfaces converters
RS-232 to RS485
1. RS-485 point to point/2.5 line media
duplex
A
B
2. RS-485 point to points / 2-line half duplex
3.
Half-duplex
telecommunication
connection
between interfaces converters
T/R+
T/R-
RXD+
RXD-
PC1
=
>
COM1
/
COM2
1
2
1
2
<=PC2
COM1
/
COM2
T/R+
T/R-
RXD+
RXD-
Ⅵ
. Defect and Solution:
1. Data telecommunication failure
A. Check wether RS232 interface connection is correct;
B. Check wether RS485/RS422 output interface connection
is correct;
C. Check wether connection end connects well
2. Data missing or mistake
A. Check wether data telecommunication equipments ends
have same speed and format.
Interface converter supports 4 kinds of
telecommunication methods as below:
1.Point to point/4-line Full Duplex;
2.Point to points/4-line Full Duplex;
3.Point to point/2-line Half-Duplex;
4.Point to points/2-line Half-Duplex.
When Full Duplex or Half-Duplex Connection, in
order
to
prevent
signal
reflection
and
interference,converter should be installed with
one matching resistor(parameter:120 ohm 1 / 4
W) at the end of the line.
Ⅴ
.
Telecommunication
connection
Sketch
RS232 to RS422
1. RS422 point to point/4 line full duplex
telecommunication
2. RS422 point to points/4 line full duplex
telecommunication
