VIPA CP 341S, Manual

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Chapter 5 Communication protocols
Manual VIPA System 300S SPEED7
5-8 HB140E - CP - RE_341-2CH71 - Rev. 09/46
The ASCII value of the start character that precedes a message to signify
the start of a data transfer. You may select 1 or 2 start characters. When
you are using 2 start characters you have to specify "2" at
Number of start
identifications
.
Range of values: 0 ... 255
Default: Start identification 1: 0, Start identification 2: 0
You may select 1 or 2 end identifications. When you select "1" as number
of end identifications, the contents of the 2. end identification is ignored.
Range of values: 0 ... 2
Default: 1
The ASCII value of the end character that follows a message to signify the
end of the data transfer. You may specify 1 or 2 end characters. When you
are using 2 end characters you have to enter a "2" at
Number of end flags
.
Range of values: 0 ... 255
Default: End flag 1: 3, End flag 2: 0
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
Start identification
1 and 2
Number end
identifications
End identification
1 and 2
Setting of receive
channel