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### Overview
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A VME rear transition module providing fiber-optic and electrical
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(RS485) inputs and outputs. Uses the
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The VMR-DIO-2CH-OPT is a VME rear transition module providing
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fiber-optic and electrical inputs and outputs. In combination with the
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[CONV-TTL-RS485](https://www.ohwr.org/project/conv-ttl-rs485/wiki) as
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front-module. A block diagram of the board is shown
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below.
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front-module it provides TTL to optical conversion. The interface with
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the [CONV-TTL-RS485](https://www.ohwr.org/project/conv-ttl-rs485/wiki)
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is through internal RS485 signaling. A block diagram of the board is
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shown below.
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![](/uploads/525681e8a07765a1099139d37a343681/OpticalRTM.png)
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https://www.ohwr.org/5387
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The design is based on the existing modules: optical transmitter
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[CTDAB](https://wikis.cern.ch/display/HT/CTDAB+-+Laser+pulse+transmitter)
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- [Designs
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notes](https://www.ohwr.org/project/vmr-dio-12ch-opt-a/wikis/design-notes)
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- https://www.ohwr.org/project/level-conversion/wiki
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- https://www.ohwr.org/project/level-conversion/uploads/df86ee8c9a2d713a65630a355101cb62/Rennovation_of_level_conversion_boards.pptx
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