DA70131-1/3E
III-19
2-5. Parts used in our experiments
Show below is a list of the parts used in the interface circuits of our experiments.
Use of other parts may change the system's response. This list is only for your reference.
Parts
Manufacturer
Model name
CAT5
Oki Wire Co., Ltd.
F-DTI-C5 (SLA)
CAT6
Oki Wire Co., Ltd.
DTI-C6X
Pulse transformer
JPC Co., Ltd.
NPT102F
Line transceiver
TEXAS INSTRUMENTS
SN75HVD05, etc.
2-6. Other precautions
- Cables
When you are planning long distance transmission, cable quality will be the single most important factor.
Specialized cables designed for use as field buses, such as those by CC-Link and LONWORKS, have guaranteed
quality and may be easier to use.
- Pulse transformers
Needless to say, the pulse transformers should handle 20 Mbps (10 MHz) without becoming saturated. The
transformer's inductance is also important.
Since up to 64 pulse transformers may be connected, the actual working specifications of these devices must
meet the requirement.
We used 1000
μH pulse transformers. However, in order to obtain better response characteristics, you may want
to try pulse transformers with a larger reactance.
- Line transceivers
We recommend you using 5V line transceiver because a 5V line transceiver has higher performance than 3.3V
one.
- Connectors
If possible, the connectors should match the cable characteristics.
Although we did not use them, modular type connecters will be better for LAN cables.
- Cable connections
Do not connect one cable to another cable (using connectors etc.).
In a multi-drop system, the number of cables increases as the number of local devices increase. However,
connecting a cable just to extend the line should be avoided.
- Processing of excess cable
Excess cable, left over after making all the runs, should be eliminated.
Unneeded cable length may restrict the line overall usable length, and may introduce electrical noise.
- Circuit board substrate
Create circuits on a substrate with 4 or more layers, to prevent the introduction of noise.
- Estimating cable length in the system design phase
In the first estimate, use shorter line lengths. In the actual system configuration, lines may be lengthened.
Estimates made using the maximum length may lead to impossible communication distances.
- Minimum cable length
Each cable must be at least 60 cm (23-1/2 in) long. Although this may seem contradictory to the excess cable
precaution, this minimum length is necessary.
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