Communication processor and Modbus TCP
12.3 Point-to-point (PtP) communication
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG
701
Table 12- 32 Data types for parameters
REQ IN Bool Start the set RS232 signals operation, on the rising edge of this input
PORT IN PORT After you install and configure a CM or CB communication device, the
port identifier appears in the parameter helper drop-list available at the
PORT box connection. The assigned CM or CB port value is the device
configuration property "hardware identifier". The port symbolic name is
assigned in the "System constants" tab of the PLC tag table. (Default
SIGNAL IN Byte Selects which signal to set: (multiple allowed). Default value: 0
• 01H = Set RTS
• 02H = Set DTR
• 04H = Set DSR
RTS IN Bool Request to send, module ready to send value to set (true or false),
DTR IN Bool Data terminal ready, module ready to send value to set (true or false).
Data set ready (only applies to DCE type interfaces), not used.
DONE OUT Bool TRUE for one execution after the last request was completed with no
ERROR OUT Bool TRUE for one execution after the last request was completed with an
STATUS OUT Word Execution condition code (Default value: 0)
Table 12- 33 Condition codes
CM or CB is RS485 and no signals can be set
Signals cannot be set because of Hardware flow control
Cannot set DSR because module is DTE
Cannot set DTR because module is DCE
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