A resistor is connected between each line and + 5v, so the idle state of the bus is high.
在+ 5 V和每根线之间连接着一个电阻，所以总线的空闲状态是高电平。
2
The resistor must also be rated high enough to meet the power dissipation requirements while the zeners are conducting.
该电阻器还应当有足够高的额定功率，以满足齐纳管导通时的功率耗散要求。
3
Only one high-quality resistor in the signal path and using the Swiss made precision attenuator with gold contacts for low contact resistance and longtime durability.