Configuring Receive Parameters - Siemens S7-1200 System Manual

Communication processor and Modbus TCP
12.3 Point-to-point (PtP) communication
Parameter
RTS On delay
RTS Off delay
Send break at message start
Number of bit times in a
break
Send idle line after a break
Idle line after a break
12.3.2.2

Configuring receive parameters

From the device configuration of the CPU, you configure how a communication interface
receives data, and how it recognizes both the start of and the end of a message. You set
these parameters in the "Receive message configuration" properties for the selected
interface.
You can also dynamically configure or change the receive message parameters from the
user program by using the RCV_CFG instruction (Page 689).
Note
Parameter values set from the RCV_CFG instruction in the user program override the
"Receive message configuration" properties. Note that the CPU does not retain parameters
set from the RCV_CFG instruction in the event of power down.
676
Definition
Specifies the amount of time to wait after activating RTS before transmission is initiated.
The range is 0 to 65535 ms, with a default value of 0. This parameter is valid only when the
port configuration (Page 672) specifies hardware flow control. CTS is evaluated after the
RTS On delay time has expired.
This parameter is applicable for RS232 modules only.
Specifies the amount of time to wait before de-activating RTS after completion of
transmission. The range is 0 to 65535 ms, with a default value of 0. This parameter is valid
only when the port configuration (Page 672) specifies hardware flow control.
This parameter is applicable for RS232 modules only.
Specifies that upon the start of each message, a break will be sent after the RTS On delay
(if configured) has expired and CTS is active.
You specify how many bit times constitute a break where the line is held in a spacing
condition. The default is 12 and the maximum is 65535, up to a limit of eight seconds.
Specifies that an idle line will be sent before message start. It is sent after the break, if a
break is configured. The "Idle line after a break" parameter specifies how many bit times
constitute an idle line where the line is held in a marking condition. The default is 12 and
the maximum is 65535, up to a limit of eight seconds.
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG