Siemens SIMATIC CP 440 Manual page 149

Technical Specifications of the X27 (RS 422/485) Interface
The table below contains the technical specifications of the X27 (RS 422/ 485)
interface of the CP 440-RS 422/485.
Table A-1 Technical Specifications of the X27 (RS 422/485) Interface
Technical Specifications
Interface
RS 422 signals
RS 485 signals
Max. transmission link
Max. transmission rate
Technical Specifications of the 3964(R) Procedure
The following table contains the general technical specifications of the 3964(R)
procedure.
Table A-2 Technical Specifications of the 3964(R) Procedure
3964(R) Procedure with Default Values
Max. message
frame length
Parameters
3964(R) Procedure, Parameterizable
Max. message
frame length
Parameters
Point-to-point connection CP 440 Installation and Parameter Assignment
A5E00057742-02
RS 422 or RS 485, 15-pin subminiature D female connector
TXD (A), RXD (A), TXD (B), RXD (B), GND
R/T (A), R/T (B), GND
All isolated against the S7-internal power supply (backplane
bus) and the external 24V DC power supply
1200 m
115200 bps
200 bytes
The following can be parameterized:
With/without a block check character
Priority: low/high
Transmission rate: 300, 600, 1200, 2400, 4800, 9600, 19200,
38400, 57600, 76800, 115200 bps
Character frame: 9, 10, 11 or 12 bits
Initial state of the receive line: none, R(A)5V/R(B)0V, R(A)0V/R(B)5V
Number of message frames to be buffered: 1 to 10, use entire buffer
200 bytes
The following can be parameterized:
With/without a block check character
Priority: low/high
Transmission rate: 300, 600, 1200, 2400, 4800, 9600, 19200,
38400, 57600, 76800, 115200 bps
Character frame: 9, 10, 11 or 12 bits
Character delay time: 20 ms to 65535 ms at intervals of 10 ms
Acknowledgment delay time: 20 ms to 65535 ms at intervals of
10 ms
Number of setup attempts: 1 to 255
Number of transmission attempts: 1 to 255
Initial state of the receive line: none, R(A)5V/R(B)0V, R(A)0V/R(B)5V
Technical Specifications
A-3