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Communication protocols
3964(R) > 3964(R) - Parameter
Character frames
Parameter
Data bits
Stop bits
Parity
Priority
3964(R) Receiving data
3964(R) Interface
46
The data between the communication partners are transferred via the serial interface by
means of a character frame. This means that each character may be recognized at the
receiver and the transmission may be checked for errors.
Please regard that all the following parameters must have the same set-
tings on every communication partner:
Description
Number of bits onto which a character is mapped.
n
Range of values: 7, 8
When data is transmitted, stop bits are appended to each
character to be sent in order to signal the end of a char-
acter.
n
Range of values: 1, 2
The addition of its value "0" or "1" brings the value of all
the bits (data bits and parity bit) up to a defined status.
n
Range of values: none, odd, even
If both communication partners issue a sent request at the
same time, the partner with the lower priority temporarily
withdraws its request. For data transmission you must set
a lower priority at one communication partner and a higher
one at the other.
n
Delete CP receive buffer on startup:
–
(Default value: "Delete CP receive buffer at startup" deactivated)
n
This parameter may not be activated.
n
The receive buffer of the CP 341-1CH01 is not deleted when the CPU status goes
from STOP to RUN (CPU startup).
With the protocol 3964(R) is the operating mode Full-duplex operation (RS422) preset.
n
Full-duplex (RS422)
–
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)
–
This setting is not available with 3964(R).
n
Initial state of the receive lines
–
For a connection with minimum reflections and the break evaluation at RS422
operation, the lines may be preset with defined static voltage levels.
VIPA System 300S
Default value
8
1
even
high
HB130 | CP | 341-1CH01 | en | 18-40
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