Basic Principles of Serial Data Transmission
2.7 Parameterization Data
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03
71
X27 (RS 422/485) interface
You will find a description of the parameters for the X27 (RS 422/485) interface in the table
below.
Table 2- 10 X27 (RS 422/485) interface (ASCII driver)
Parameter Description Range of values Default value
Operating mode Specifies whether the X27
(RS 422/485) interface is to
be run in full-duplex mode
(RS 422) or half-duplex
mode (RS 485) (see Chapter
"Serial Transmission of a
Character (Page 23)").
Full-duplex (RS 422)
four-wire mode
Half-duplex (RS 485)
two-wire mode
Full-duplex (RS 422) four-
wire mode
Receive line initial state This initial state corresponds
to idle state (no senders
active) in "half-duplex (RS
485) two-wire mode".
R(A) 5V/R(B) 0V
R(A) 0V / R(B) 5V
R(A) 5V/R(B) 0V
Receive line initial state
The figure illustrates the wiring of the receiver at the X27 (RS 422/485) interface:
9
9
9
9
5%
5$
5%
5$
5$95%9
IXOOGXSOH[GHIDXOW
5$95%9
KDOIGXSOH[IXOOGXSOH[
Figure 2-19 Wiring of the receiver at the X27 (RS 422/485) interface
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