Product Description
1.4 Properties of the serial interface
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03
19
RS 232C signals
The table below shows the meaning of the RS 232C accompanying signals.
Table 1- 5 RS 232C interface signals
Signal Designation Meaning
TXD Transmitted Data Transmitted data; transmission line is maintained at logic "1" by the communication
processor in idle state.
RXD Received Data Received data; receive line must be maintained at logic "1" by communication
partner.
RTS Request To Send RTS "ON": Communication processor is ready to send.
RTS "OFF": Communication processor is not sending.
CTS Clear to send Communication partner can receive data from the communication processor. The
communication processor expects this signal in response to RTS "ON".
DTR Data terminal ready DTR "ON": Communication processor is active and ready for operation.
DTR "OFF": Communication processor is not active and not ready for operation.
DSR Data Set Ready DSR "ON": Communication partner is active and ready for operation.
DSR "OFF": Communication partner is not active and not ready for operation.
RI Ring Indicator Incoming call when connecting a modem
DCD Data carrier detect Carrier signal when connecting a modem
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