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# CONV-TTL-RS485 RTM in DB9
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An RTM for the CONV-TTL-RS485 board has already been designed and
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tested. It is a 6 channel RTM with each channel capable of receiving one
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input in RS485 and repeating it on 3 outputs.
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This RTM uses LEMO 0S connectors with 2 pins.
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An [RTM](https://edms.cern.ch/item/EDA-02494-V2-0/0) for the
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CONV-TTL-RS485 board has already been designed and tested. It is a 6
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channel RTM with each channel capable of receiving one input in RS485
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and repeating it on 3 outputs.
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This RTM uses LEMO 0S connectors with 2
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pins.
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![](/uploads/16f77ac7d87a9cffa6a78b20e7fb745a/db9rtm-mockup.PNG)
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\_Side-by-side are the current CONV-TTL-RS485 RTM with LEMO 0S
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interface
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and a mock-up of the 2-channel version with D-Sub9 interface\_
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A new RTM design for the CONV-TTL-RS485 is being proposed to fullfill a
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number of user requirements:
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... | ... | @@ -16,7 +24,7 @@ number of user requirements: |
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- The use of the RS485 protocole is mainly required in fanout
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topologies, where one signal must be propagated to multiple
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locations. The 6 channels on the LEMO 0S RTM, although offer 3
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outputs each, still need to be manually daisy chained in order
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outputs each, still need to be manually daisy-chained in order
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to offer a maximum number of output signals.
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<!-- end list -->
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... | ... | @@ -28,8 +36,9 @@ number of user requirements: |
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- Each of the two channels will repeat the input signal on 5
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output ports (Limited by the physical size of the RTM Piggyback
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panel).
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- The RTM must be designed in the *piggyback* format, in order to
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be mounted on the same [RTM
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- The RTM must be designed in the *piggyback* format, similar to
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the [LEMO 0S RTM](https://edms.cern.ch/item/EDA-02494-V2-0/0),
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in order to be mounted on the same [RTM
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motherboard](https://edms.cern.ch/project/EDA-02452)
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used for
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[CONV-TTL-RS485](https://www.ohwr.org/project/conv-ttl-blo/wiki)
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