Communication processor and Modbus TCP
13.3 Point-to-point (PtP) communication
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
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RTS On delay 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 1093) specifies hardware flow control. CTS is evaluated after the
RTS On delay time has expired.
This parameter is applicable for RS232 modules only.
RTS Off delay Specifies the amount of time to wait before de-activating RTS after completion of transmis-
sion. The range is 0 to 65535 ms, with a default value of 0. This parameter is valid only
when the port configuration (Page 1093) specifies hardware flow control.
This parameter is applicable for RS232 modules only.
Send break at message start
Number of bit times in a
break
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 condi-
tion. The default is 12 and the maximum is 65535, up to a limit of eight seconds.
Send idle line after a break
Idle line after a break
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.
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 Receive_Config instruction (Page 1115).
Note
Parameter values set from the Receive_Config 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 or transition to STOP.
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