Siemens SIMATIC CP 340 User Manual page 160

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