Sharp IQ-8000 Manual de instalación descargar pdf (Pagina 80)

7.10.3 Optical Transmission

The 485-2 series has been designed to be a reliable link for the transmission of data over long

distances. The loss budget of 15 dB on 16.2u fiber should allow up to 5 kilometers of

transmission distance.

The power output specifications are measured with a logic low state on the bus. When the bus is

in the high impedance state, the transmission LED is at a very low output level (<-36dBm). Logic

levels are encoded using pulse width modulation. If the optical connection is lost, the output bus

goes to the HiZ state.

IFS (International Fiber Systems, Inc.) also follows similar specifications in their D1300 and

D2300 series of RS-485 (Tri-state) fiber optics transceivers and repeaters. The following diagram

illustrates the basic wiring connection using either of the 2 systems. Refer to the installation

instructions of the specific supplier for more information.

NOTE: The MX-485-2, D2300 and D1300 have not been evaluated by UL, and is not

suitable for UL installations.

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Sharp IQ-8000 Manual de instalación Pagina 80