Siemens SIMATIC CP 340 User Manual page 73

Parameter Description
Activate You can choose whether monitoring for an
BREAK interrupted receive line should be activated or
monitoring deactivated.
If BREAK monitoring is deactivated, in the event
of a BREAK
1. No entry will be made in the diagnostic buffer,
nor will the RECV FB be activated with set
ERROR bit and corresponding STATUS entry
2. Activated send jobs will be sent without an
error message being generated for the user
Data flow control
The table below contains a description of the parameters for data flow control.
Data flow control is not possible with the RS 485 interface. RTS/CTS data flow control is only
supported on the RS 232C interface.
Table 2- 12 Data flow control (printer driver)
Parameter
Data flow control
XON character
(Only for data flow control
with XON/XOFF)
XOFF character
(Only for data flow control
with XON/XOFF)
Wait for XON after XOFF
(wait time for CTS = ON)
(Only for data flow control
with XON/XOFF or
RTS/CTS)
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03
Description
Defines which data flow
control procedure is used.
Code for XON character
Code for XOFF character
Period of time for which the
CP 340 should wait for the
XON code or for CTS="ON"
of the communication partner
when sending.
Basic Principles of Serial Data Transmission
Range of values
Yes

No

Range of values
None

XON/XOFF

RTS/CTS

At 7 data bits:

0 to 7FH (hex)
8 data bits:

0 to FFH (hex)
(Depending on whether you
set 7 or 8 data bits for the
character frame)
At 7 data bits:

0 to 7FH (hex)
8 data bits:

0 to FFH (hex)
(Depending on whether you
set 7 or 8 data bits for the
character frame)
20 ms to 65530 ms
in 10 ms increments
2.7 Parameterization Data
Default value
Depending on the HW variant
used and the operating mode
selected:
RS 232 Yes
TTY Yes
RS 422 with Yes (cannot be
R(A)5V/R(B)0V: deactivated)
RS 422 with No (cannot be
R(A)0V/R(B)5V: activated)
With the RS 422 HW variant, this
parameter is controlled implicitly
via the initial state for the receive
lines selected in the "Interface"
folder.
Default value
None
11 (DC1)
13 (DC3)
2,000 ms
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