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Purpose
The RPT-485WF is used to provide fiber optic capability, which may be necessary in environments exposed
to strong electromagnetic interference such as power plants and areas with frequent lightning or in areas
where a high level of security is required. The RPT-485WF optically isolates the EIA-485 annunciator loop
eliminating ground loops and noise.
Features
Extends the EIA-485 loop up to 10,000 ft with a 10dB maximum guaranteed (15dB typically achievable)
attentuation for 820-850 nM fiber optic cable.
Allows additional boosted EIA-485 loops.
Each boosted loop increases annunciator node capacity by 32.
Optically isolated.
Two LEDs indicate data reception.
Removable terminal blocks.
A variety of mounting options.
Fiber Optic Cable Requirements
Dual Fiber 62.5/125um, with ST* Bayonett style connectors.
Note: Use the protective caps to protect the cable connections from damage and dirt accumulation when the
cable is not connected.
*ST is a registered trademark of AT&T Lightguide Cable Connectors.
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Section Three:
RPT-485WF
Figure 3-1: RPT-485WF
Document 15640 Rev B1 08/13/97 P/N 15640:B1
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