VIPA CP 341S, Manual

Page: 55 / 70

Manual VIPA System 300S SPEED7
Chapter 5 Communication protocols
HB140E - CP - RE_341-2CH71 - Rev. 09/46 5-5
For a connection with minimum reflections and the break evaluation at
RS422/485 operation, the lines may be preset with defined static voltage
levels. At the CP interface the wiring of the receiver is realized as follows:
Value Description Wiring of the receiver
None
No preassignment of the receiving lines.
This setting only makes sense with bus-
capable special drivers.
R(B) +
R(A) -
Signal R(A) 5Volt
(Break evaluation)
Signal R(B) 0Volt With this preassignment break detection is
possible at full-duplex operation (RS422).
0V
5V
R(B) +
R(A) -
Signal R(A) 0Volt
Signal R(B) 5Volt
This preassignment corresponds to the idle
state (no sender is activated) at half-duplex
operation with RS485. Wire-break
recognition is not possible, here.
R(B) +
R(A) -
5V
0V
Range of values: none, R(A) 5Volt R(B) 0Volt, R(A) 0Volt R(B) 5Volt
Default: none
Via the operating mode you may specify if the interface is operated in half-
(RS485) or full-duplex (RS422) operation.
Note!
At half-duplex parameterization with RS485 software data flow control is
not possible.
Value Description
full-duplex
Four-wire operation (RS422)
Data is exchanged between the communication partners in both
directions simultaneously. In full-duplex operation, therefore, data may be
sent and received at the same time. Each communication partner must be
able to operate a send and a receive facility simultaneously.
half-duplex Two-wire operation (RS485)
Data is exchanged between the communication partners but only in one
direction at a time. In half-duplex operation, therefore, at any one time
data is being either sent or received.
Range of values: full-duplex, half-duplex
Default: full-duplex
Setting of receive
channel
Operating mode