Bus Cable and Bus Length¶
| Two cores for the bus signals | N/A = green = connector pin 2 P/B = red = connector pin 4 (Dsub9 connector: N/A = pin 8, P/B = pin 3) |
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| Characteristic impedance | 150 Ω ± 15 Ω (for 3…20 MHz) | ||
| Cross section | 0.22 mm² = ca. AWG 24 | ||
| Cable capacity typ. | 30 nF/km | ||
| Insulation material | PE foam | ||
| Shielded with | metallized foil | ||
| Two cores to supply the plugs | +24 V DC = brown = connector pin 1 0 V = blue = connector pin 3 |
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| Cross section | 0.5 mm² = ca. AWG 20 | ||
| Wire resistance | 38.9 Ω/km | ||
| Insulation material | PE | ||
| Outer shield and jacket | braided screen + metallized plastic foil + shield litz = connector pin 5, for both signal and supply cores |
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| Shield litz | 0.5 mm² = ca. AWG 20 | ||
| Jacket | PU, pink, colour ca. RAL 4001 | ||
Bending radius (fixed installation) |
10 times jacket diameter | ||
Temperature range (fixed installation) |
-30°C…+80°C | ||
Caution
Exchange of bus signal lines with supply lines can cause destruction of the plug.
| Data rate [kBit/s] | 9.6 | 19.2 | 45.45 | 93.75 | 187.5 | 500 | 1500 | 3000 | 6000 | 12000 |
| Bus length [m] | 800 | 650 | 300 | 160 | 80 |
| max. drop length* [m] | * | * | 6.6 | 0 | 0 |
* The max drop length is defined by the standard only for 500 kBit/s, but for lower data rates higher drop lengths are possible. Higher data rates do not allow drop lines.
The max. data rate depends directly on the bus length: