Siemens Simatic S7-300 CP 341 User Manual page 215

Technical specifications for the X27 (RS 422/485) Interface
The table below shows the technical specifications for the X27 (RS 422/485) interface of the
CP 341–RS 422/485.
Table A- 4
Technical specifications
Interface
RS 422 signals
RS 485 signals
Max. transmission distance
Max. baud rate
Technical specifications for the 3964(R) procedure
The table below shows the technical specifications for the 3964(R) procedure.
Table A- 5
3964(R) procedure with default values
Max. message frame
length
Parameters
3964(R) procedure with parameterization
Max. message frame
length
Parameters
CP 341 Point-to-Point Communication, Installation and Parameter Assignment
Manual, 09/2008, A5E02191071-01
www.gkbpx.com
Technical specifications of the X27 (RS 422/485) interface
RS 422 or RS 485, 15-pin sub D female connector
TXD (A), RXD (A), TXD (B), RXD (B), GND
R/T (A), R/T (B), GND
All electrically isolated relative to the S7-internal supply (backplane
bus) and the external 24 V DC supply
1200 m
115200 baud
Technical specifications for the 3964(R) procedure
4096 bytes
The following can be assigned:
With/without 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
•
Receive line initial state: none, R(A)5V/R(B)0V, R(A)0V/R(B)5V
•
4096 bytes
The following can be assigned:
With/without 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 655350 ms in 10 ms grid
•
Acknowledgment delay time: 20 ms to 655350 ms in 10 ms grid
•
Number of connection retries: 1 to 255
•
Number of transmission retries: 1 to 255
•
Receive line initial state: none, R(A)5V/R(B)0V, R(A)0V/R(B)5V
•
Technical Specifications
A.1 Technical Specifications of the CP 341
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