Drop lines
Drop lines must always be avoided as far as possible, since they inevitably cause reflections. The reflections caused by drop lines are not however usually critical, provided they have decayed fully before the sampling time. In the case of the bit timing settings selected in the Bus Couplers it can be assumed that this is the case, provided the following drop line lengths are not exceeded:
|
Baud rate |
Drop line length |
Total length of all drop lines |
|---|---|---|
|
1 Mbit/s |
< 1 m |
< 5 m |
|
500 kbit/s |
< 5 m |
< 25 m |
|
250 kbit/s |
< 10 m |
< 50 m |
|
125 kbit/s |
< 20 m |
< 100 m |
|
50 kbit/s |
< 50 m |
< 250 m |
Drop lines must not have terminating resistors.
