Robotic payload interface checklist

1. Identify the exact equipment and documents

Record the payload model, hardware revision and firmware version before comparing specifications. Two units with the same product name can expose different connectors or software behaviour. Keep datasheets, drawings and software documentation beside the interface record, with their revision or retrieval date. Identify which party controls a change to each side of the interface.

• List the platform, payload, adapter and supporting computer.
• Identify required licences, drivers, SDKs and access restrictions.
• Record missing documentation as an action rather than an assumption.

2. Check the physical installation

Describe the installed assembly, including its mount and cable route. Check useful operation as well as physical fit: a protective cover can obstruct a sensor, and a service connector may become unreachable after assembly. Mark the coordinate origin and orientation on a simple drawing that both parties can read.

• Record dimensions, mass, centre of gravity and fixing details.
• Show clearances, field of view and any moving envelope.
• Identify cable strain relief, replacement access and environmental limits.

3. Establish the power interface

State voltage limits at the payload connector, including expected variation during startup and other platform loads. Record steady demand, peaks and startup current separately. Define protection, grounding and shutdown behaviour with the responsible electrical engineer. Plan initial bench checks using an appropriate protected supply and agreed current limits before connecting the full system.

• Identify connector part numbers, pin numbers and the drawing's viewing direction.
• Record polarity, protective devices and permitted connection sequence.
• Define the response to interrupted power, low voltage and an unsuccessful restart.

4. Define what the data means

Specify units, coordinate frames, timestamps and missing-data behaviour alongside the protocol name. ROS REP 103 describes standard units and coordinate conventions for ROS systems; any interface using another convention needs an explicit conversion. A numeric value is not usable until its meaning, origin and age are clear.

• Record transport, message format, expected rate and maximum useful data age.
• Identify axes, units, time source, frame names and calibration revision.
• Define how invalid, stale, unavailable and out-of-range readings are represented.

Reference: ROS REP 103: Standard Units of Measure and Coordinate Conventions

5. Define identity, commands and control ownership

List the commands the operator needs and the state in which each is permitted. Define acknowledgement and the evidence that an action actually finished. In a MAVLink network, the combination of system and component identifiers distinguishes components. Record those identities so that the ground station does not direct a command to the wrong device.

• Name the command owner and any separate observer role.
• Specify startup, ready, active, fault and shutdown indications.
• Define behaviour when a connection disappears and later returns.

Reference: MAVLink System and Component ID Assignment

6. Plan checks at each boundary

Start with document and unpowered connection checks, then use a controlled bench setup before a platform trial. Include simultaneous loads and recording where relevant. Check whether heat, a restart or a busy link changes the observed behaviour. Avoid deliberately introducing a damaging fault; the engineer should choose a representative and controlled verification method.

• Check mounting access, polarity and interface identity before energising.
• Observe startup current, temperature, data freshness and operator indications.
• Record expected and observed results for disconnect, restart and recovery checks.

7. Close the interface record

Agree the configuration that passed each check and retain the evidence with it. A later firmware, cable or mount change may require selected checks to be repeated. RCDEN can use the record to scope payload integration around an existing platform or a system in development; compatibility remains a result to establish through engineering assessment.

• List accepted interfaces, unresolved limits and remaining actions.
• Identify the person who approves changes on each side.
• Record which checks must be repeated after a proposed change.

Further reading

• ROS REP 103: Standard Units of Measure and Coordinate Conventions
• MAVLink System and Component ID Assignment