X20 system modules • Bus controllers • X20BC0043-10
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X20 system User's Manual 3.10
4.5.3.10 Setting the transfer rate
The bus controller will detect the transfer rate automatically by default. Switch positions 0x80 - 0x88 can be used
to set a fixed transfer rate, or 0x89 can be used to enable automatic transfer rate detection.
Switch position
Transfer rate
0x80
1000 kbit/s
0x81
800 kbit/s
0x82
500 kbit/s
0x83
250 kbit/s
0x84
125 kbit/s
0x85
100 kbit/s
0x86
50 kbit/s
0x87
20 kbit/s
0x88
10 kbit/s
0x89
Automatic transfer rate detection
Table 123: Possible transfer rates
Programming the transfer rate
1. Turn off the power supply to the bus controller.
2. Define the transfer rate to be programmed by setting the node numbers (0x80 - 0x89)
3. Turn on the power supply to the bus controller.
4. Wait until the "MS" LED blinks with a red triple-flash (transfer rate is now programmed).
5. Turn off the power supply to the bus controller.
6. Set the desired node number (0x01 - 0x7F).
7. Turn on the power supply to the bus controller.
8. The bus controller now boots with the set node number and the programmed transfer rate.
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