4
MULTINET SERIAL TO ETHERNET CONVERTER – INSTRUCTION MANUAL
INSTRUCTION MANUAL
4.
10BASE-F Fiber Optic Port
The fiber optic communications port allows for fast and efficient communications with
Modbus TCP/IP at 10 Mbps. Fiber optic transmissions provide an ideal solution for areas
where RS485 communications or Ethernet via a twisted pair have traditionally caused
problems. Fiber is immune to electrical interference and provides complete isolation.
Optical fibers may be connected to the MultiNet supporting a wavelength of 820 nm in
multimode. Optical fiber is only available with the MultiNet-FE option (see the Order Code
for details). The MultiNet-FE has a 10BaseF transmitter/receiver for optical fiber
communications and supports optical fiber sizes of 50/125
μ
m, 62.5/125
μ
m, and 100/140
μ
m. The fiber optic port is designed such that the response times will not vary for any core
100
μ
m or less in diameter. For optical power budgeting, splices are required every 1 km
for the transmitter/receiver pair (the ST type connector contributes for a connector loss of
0.2 dB). When splicing optical fibers, the diameter and numerical aperture of each fiber
must be the same. Only a quarter turn of the coupling is required to engage or disengage
the ST type connector.
The 10BaseT Ethernet port and the 10BaseF Fiber port are internally linked and should not
be used together.
CAUTION
Ensure 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.
CAUTION
Observing any fiber transmitter output may cause injury to the eye!
