3AFE68969972 模块 插件 主板
需要传输距离和最大传输速度，应使用屏蔽双绞线。互电容不得超过52.5 pF/m，电缆面积应至少为0.25 mm2（AWG 24）0 V，通信参考电压应包含在布线中。双向通信使用两对；一对用于通信，一对用于0V。屏蔽必须在一端接地。另一端通常接地，但距离较长或接地电位存在差异时，屏蔽应通过0.1µF/250 V塑料电容器接地，以防止编织屏蔽中的接地电流。许多制造商建议transfer distance and maximum transfer speed is needed, shielded and twisted pair cable should be used. The mutual capacitance may not exceed 52.5 pF/m, and the cable area should be at least 0.25 mm2 (AWG 24). • 0 V, the reference voltage for communication should be included in the cabling. With two-way communication use two pairs; one pair for communication and one pair for 0 V. • The shield must be grounded at one end. The other end is usually grounded, but with longer distances or when there is a difference in the ground potential, the shield should be connected to the ground via 0.1 µF/250 V plastic capacitor to prevent ground current in the braided shield. A number of manufacturers recommend
