GE B30 UR Series Instruction Manual page 72

Bus differential system

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Lightning strikes and ground surge currents can cause large momentary voltage differences between remote ends of the

communication link. For this reason, surge protection devices are internally provided at both communication ports. An iso-

lated power supply with an optocoupled data interface also acts to reduce noise coupling. To ensure maximum reliability, all

equipment should have similar transient protection devices installed.

Terminate both ends of the RS485 circuit with an impedance as shown below.

c) 100BASE-FX FIBER OPTIC PORTS

Ensure that the dust covers are installed when the fiber is not in use. Dirty or scratched connectors can lead to high

losses on a fiber link.

The fiber optic communication ports allow for fast and efficient communications between relays at 100 Mbps. Optical fiber

can be connected to the relay supporting a wavelength of 1310 nm in multi-mode.

Figure 3–24: RS485 SERIAL CONNECTION

B30 Bus Differential System