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Communication protocols
ASCII > ASCII - Parameter
Data flow control
Parameter
Data flow control
Data flow control
parameters
Parameter
XON code
XOFF code
Wait for XON after XOFF
(Wait time for CTS=ON)
ASCII Receiving data
Parameter
Buffered receive message
frames
Prevent overwriting
Interface
40
Description
n
Range of values: none, XON, XOFF
Description
Code for XON at "XON/XOFF"
n
Range of values: 0...7Fh/FFh (7/8 data bits)
Code for XOFF at "XON/XOFF"
n
Range of values: 0...7Fh/FFh (7/8 data bits)
Time for the CP to wait for CTS=ON from the partner when
sending data.
n
Range of values: 20 ... 65535ms in 10ms steps
Receipt telegrams are buffered in the CP at a ring buffer. Here the oldest telegram is
always transferred by the CP to the CPU.
Description
Number of message frames, which are to be buffered in
the CP buffer.
n
Range of values: 1 ... 250
You can only deactivate this check box if the parameter
"Buffered receive message frames" is set to "1". In this
way a current telegram is always transferred to the CPU.
n
Range of values: activated, deactivated
Here it is to specify if the interface is operated in half- (RS485) or full-duplex (RS422)
operation.
Full-duplex (RS422)
n
–
Four-wire operation (default value: active)
Data is exchanged between the communication partners in both directions simul-
taneously. 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.
n
Half-duplex (RS485)
–
Two-wire operation (default value: not activated)
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. This setting is only available with the ASCII protocol.
n
Initial state of the receive lines
–
For a connection with minimum reflections and the break evaluation at
RS422/485 operation, the lines may be preset with defined static voltage levels.
VIPA System 300S
Default value
none
Default value
11(DC1)
13(DC3)
20 000ms
Default value
250
activated
HB130 | CP | 341-1CH01 | en | 18-40
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