Technical Specifications
A.1 Technical Specifications of the CP 341
CP 341 Point-to-Point Communication, Installation and Parameter Assignment
Manual, 09/2008, A5E02191071-01
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 of the X27 (RS 422/485) interface
Technical specifications
Interface
RS 422 or RS 485, 15-pin sub D female connector
RS 422 signals
RS 485 signals
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
Max. transmission distance 1200 m
Max. baud rate
115200 baud
Technical specifications for the 3964(R) procedure
The table below shows the technical specifications for the 3964(R) procedure.
Table A- 5
Technical specifications for the 3964(R) procedure
3964(R) procedure with default values
Max. message frame
length
4096 bytes
Parameters
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
3964(R) procedure with parameterization
Max. message frame
length
4096 bytes
Parameters
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
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