W&T 18801, Руководство пользователя

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93
W&T
Interface modules
Subject to error and alteration
Fiber Optic Interface Modules, #1812x
Function
The W&T Interface Modules 18120 and 18121 provide a
fiber optic interface with ST connectors for devices equipped
with a serial TTL port. Modules 18120 and 18121 differ only in
the arrangement of the post connector for the serial TTL port,
and are in every other respect functionally identical.
The light used for data transmission has a wavelength of 820
nm. Commonly available Multimode duplex glass fiber optic
cable in 50/125µm or 62.5/125µm is used as the transmission
medium, which due to its wide application in networking is
easily available and cost-effective. This means that even
already existing glass fiber optic lines intended for use in
networks can easily be used for transmitting serial data.
Depending on the attenuation of the glass fiber optic cable
used, data can be transmitted over a distance of maximum
3800 meters.
Important installation note
When installing or replacing the Interface Modules, visually
inspect to ensure that the module does not cause a short
circuit with adjacent components.
Supply voltage
The Interface Modules require a regulated supply voltage of
5V DC ±5%. The current draw of the modules is approx. 60mA
(typ.).
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