Appendix A    Specifications   
6F8C1259 
  A.3  PA912 Transmission Specifications 
 
Table A-4    PA912 transmission specifications 
PROFIBUS standard  EN50170, IEC61158 
PROFIBUS protocol version  DP-V0 
Topology  Bus topology 
Number of transmission stations 
(including the PA912) 
Up to 32 stations/segments (no repeater) 
Up to 124 stations (up to 9 repeaters) 
Data transmission speed  9.6 kbps-12 Mbps 
Physical layer  RS-485 (with photocoupler isolation) 
Transmission code  Manchester code 
Modulation method  Baseband 
Access method  Token passing 
Transmission service  Cyclic transmission 
    Input: 768 words + RAS information 35 words
    Output: 768 words