Page History

DACI Decision

Page properties

Status

colour	Yellow
title	In progress

Impact

Driver

Approver

Contributors

Informed

Due date

13 Dec 2025

Outcome

Tip

title	Recommendations

Info

title	Contributors

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Any constraints and challenges we need to consider to make this decision and following action plan.

Info

title	Impact rating

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Decision characteristics

Status

colour	Red
title	High

Status

Status

We need to select a physical layer standard for data communication between Oligo's bus and our payload.

	Option 1: Do nothingRS-422	Option 2: RS-485	Option 3: LVDS
Description	A standard for serial communication allowing a single driver to connect to multiple receivers, using differential signaling for noise immunity.	An upgraded standard of RS-422 allowing for multiple drivers and receivers on a single bus.	A physical layer specification for high-speed, low-power digital interfaces, often used for video or high-bandwidth data transfer.
Rollout plan
Pros and cons	High noise immunity Long cable lengths Simpler timing that RS-485 Unidirectional (single driver only) Requires 4 wires for full duplex	True multipoint network High noise immunity Long cable lengths Requires software to handle bus turnaround to prevent data collisions	Extremely high data rates Very low power consumption (350 mV swings) Low EMI Point to point Requires strict and precise PCB routing Shorter cable lengths
Risks
Estimated cost and effort	Cost: Low Effort: Low	Cost: Low Effort: Medium/High	Cost: Medium/High Effort: High