Technical Specifications
A.1 Technical Specifications of the CP 340
PtP coupling and configuration of CP 340
160 Manual, 04/2011, A5E00369892-03
Technical specifications for the RS 232C interface
The table below shows the technical specifications for the RS 232C interface of
CP 340-RS 232C.
Table A- 2 Technical specifications for the RS 232C interface
RS 232C interface
Interface RS 232C,
9-pin sub D male connector
RS 232C signals TXD, RXD, RTS, CTS, DTR, DSR, RI, DCD, GND
all isolated from S7-internal power supply
Max. transmission distance 15 m
Technical specifications for the 20mA-TTY interface
The table below shows the technical specifications for the 20 mA-TTY interface of
CP 340-20mA-TTY.
Table A- 3 Technical specifications for the 20mA-TTY interface
Technical specifications
Interface 20 mA current loop TTY,
9-pin sub D socket
TTY signals Two isolated 20 mA current sources,
receive loop (RX) "–" and "+"
send loop (TX) "–" and "+"
all isolated from S7-internal power supply
Max. transmission distance 100 m active, 1000 m passive
Technical specifications for the X27 (RS 422/485) interface
The table below shows the technical specifications for the X27 (RS 422/485) interface of
CP 340–RS 422/485.
Table A- 4 Technical specifications for the X27 (RS 422/485) interface
Technical specifications
Interface RS 422 or RS 485,
15-pin sub D socket
RS 422 signals
RS 485 signals
T (A)-, R (A)-, T (B)+, R (B)+, GND
R/T (A)-, R/T (B)+, GND
all isolated from S7-internal power supply
Max. transmission distance 1200 m
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