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DA70131-1/3E
III-18
2. Recommended environment
Shown below are the results of our experimental communication results and the environment used for the
experiment.
These results can be used to design your own system. However, other system configurations are possible. The
example below is only for your reference.
Conditions
Results
Transmission
rate
Number of
local
devices
Cable
used
Terminating
resistor
Pulse
transformer
I/F chip
Max.
length
20 Mbps
32
CAT5
100 ohm
1000
μH
RS485
100 m
20 Mbps
64
CAT5
100 ohm
1000
μH
RS485
50 m
10 Mbps
64
CAT6
100 ohm
1000
μH
RS485
100 m
Note: In the figures above, the maximum length figures are results from ideal conditions in a laboratory.
In actual use, the results may not be the same.
2-1. Cable
Commercially available LAN cables were used.
CAT5: Category 5
CAT6: Category 6
We used these LAN cables because they are high quality, cheap, and easy to obtain. Lower quality cables (such as
cheap instrument cables) may significantly reduce the effective total length of the line. LAN cables normally consist
of several pair of wires. Make sure to use wires from the same pair for one set of communication lines.
Even when using cables with the same category and rating, the performance of each cable manufacturer may be
different. Always use the highest quality cables in the same category.
2-2. Terminating resistor
Select resistors that match the impedance of the cable used.
Normally, a 100 ohm resistor is recommended. Therefore, we used terminating resistors with this value.
Adjusting this resistor value may improve the transmission line quality.
2-3. Pulse transformer
We recommend using pulse transformers, in order to isolate the GND of each local device.
By isolating the GNDs, the system will have greater resistance to electrical noise. If pulse transformers are not
used, the transmission distance may be less.
We used 1000
μH transformers in our experiments.
2-4. I/F chip
We selected I/F chips with specifications better than the RS485 standard.
In the experiment, we used 5V type line transceivers. We recommend you not to use 3.3V type line transceiver
because of its poorer performance. We recommend using ones with fail-safe function.
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