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Configuring and Parameter Assignment the CP 440
5.4 Configuration data
Operating Mode/Initial State of the Receive Line
The table below contains descriptions of the operating mode/initial state of the receive line
for the X27 (RS 422/485) interface.
Table 5-9
X27 (RS 422/485) Interface (ASCII Driver)
Parameters
Description
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).
Initial state of
none:
receive line
This setting only makes sense with
bus-capable special drivers.
R(A) 5V / R(B) 0V
Break evaluation is possible with this
initial state. (Cannot be set with "Full
Duplex (RS422) Four-Wire Mode
Multipoint Master" and "Half Duplex
(RS485) Two-Wire Mode")
R(A) 0V/R(B) 5V:
This initial state corresponds to the idle
state (no sender active). Break
detection is not possible with this initial
state.
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Value Range
Full Duplex (RS 422) Four-Wire
•
Mode Point-to-Point
Operating mode for point-to-point
communication in four-wire mode
Full Duplex (RS 422) Four-Wire
•
Mode Multipoint Master
Operating mode for multipoint
communication in four-wire mode
if the CP is a master.
Full Duplex (RS 422) Four-Wire
•
Mode Multipoint Slave
Operating mode for multipoint
communication in four-wire mode
if the CP is a slave.
Half Duplex (RS 485) Two-Wire
•
Mode
Operating mode for point-to-point
or multipoint communication in
two-wire mode. The CP can be a
master or slave.
None
•
R(A) 5V / R(B) 0V
•
(break detection)
R(A) 0V / R(B) 5V
•
Point-to-point connection CP 440 Installation and Parameter Assignment
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Default Value
Full Duplex
•
(RS 422) Four-
Wire Mode Point
to Point
Depends on the
operating mode set
Manual, 09/2007, A5E00057742-03
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