Configuring and Parameter Assignment the CP 440
5.4 Configuration data
Point-to-point connection CP 440 Installation and Parameter Assignment
74 Manual, 09/2007, A5E00057742-03
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 Value Range 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).
• 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.
• Full Duplex
(RS 422) Four-
Wire Mode Point
to Point
Initial state of
receive line
none:
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.
• None
• R(A) 5V / R(B) 0V
(break detection)
• R(A) 0V / R(B) 5V
Depends on the
operating mode set
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