AEG 239 D User Manual download pdf (Page 9)

COMMUNICATIONS GUIDE

239 MOTOR PROTECTION RELAY – COMMUNICATIONS GUIDE CG–5

8. is j = 8? No: go to 5.

Yes: go to 9.

9. i+1 --> i

10. is i = N? No: go to 3.

Yes: go to 11.

11. A --> CRC

CG.2.2 Timing

Data packet synchronization is maintained by timing constraints. The receiving device

must measure the time between the reception of characters. If three and one half

character times elapse without a new character or completion of the packet, then the

communication link must be reset (i.e. all slaves start listening for a new transmission

from the master). Thus at 9600 baud a delay of greater than 3.5 * 1/9600 * 10 = 3.65

ms will cause the communication link to be reset.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 57 58

No comments

AEG 239 D User Manual Page 9