RS485 通讯电缆 传输线综合数据
导体结构 | 绝缘外径规定值mm | 护套厚度规定值mm | 直流导体电阻Ω/100m | 绝缘电阻MΩ▪km | ||
绞对数×每绞对芯数×截面(规格)mm² | 最大单丝直径mm | |||||
单根 | 7股 | |||||
1×2×0.2 | 0.50 | 0.20 | 1.2 | 0.8 |
≤9.6 |
≥0.015 |
1×2×0.3 | 0.60 | 0.25 | 1.6 | 0.8 | ||
1×2×0.5 | 0.80 | 0.30 | 1.9 | 0.8 | ||
1×2×0.75 |
1.00 | 0.37 | 2.3 | 0.8 | ||
2×2×0.2 |
0.50 | 0.20 | 1.2 | 0.8 | ||
2×2×0.3 |
0.60 | 0.25 | 1.6 | 0.8 | ||
2×2×0.5 |
0.80 | 0.30 | 1.9 | 0.8 | ||
2×2×0.75 |
1.00 | 0.37 | 2.3 | 0.8 | ||
1×2×0.2+1×0.2a |
0.50 | 0.20 | 1.2 | 0.8 | ||
1×2×0.3+1×0.3a |
0.60 | 0.25 | 1.6 | 0.8 | ||
1×2×0.5+1×0.5a |
0.80 | 0.30 | 1.9 | 0.8 |
≥0.015 |
|
1×2×0.75+1×1×0.75a |
1.00 | 0.37 | 2.3 | 0.8 | ||
a 两芯绞对线与单芯组合 |
RS485 通讯电缆 传输线特征参数
特性阻抗Ω | 互电容(800MHz)nF▪km | 近端串音衰减dB/100m | 衰减dB/100m |
f=0.064 MHz:120±24 |
≤60 |
f=0.077 MHz:≥61 |
f=0.256 MHz:≤1.5 |
≤60 |
f=1 MHz:≥59 |
f=0.772MHz:≤2.4 |
|
≤60 |
f=2 MHz:≥55 |
f=1 MHz:≤2.7 |
|
≤60 |
f=4 MHz:≥50 |
f=4 MHz:≤5.2 |
|
f=0.064 MHz:100±15 |
≤60 |
f=8 MHz:≥46 |
f=10 MHz:≤8.4 |
≤60 |
f=10 MHz:≥44 |
f=16 MHz:≤11.2 |
|
≤60 |
f=16 MHz:≥41 |
f=20 MHz:≤11.9 |
|
≤60 |
f=20 MHz:≥40 |