How RMAS interface boxes are production tested

Every RMAS interface box follows controlled electrical and communications checks before it is accepted for supply.

Purpose of the test

The production process demonstrates that each interface box is electrically safe, receives the correct supply, and passes radar data and configuration information through the intended ports. The evidence supports National Highways product approval for the MIDAS application.

Controlled equipment and instructions

Reference	Purpose
TWI-176	Controlled test work instruction and fault-finding route
MK343-02	RMAS interface box test box
TE0587	Controlled test equipment reference
PTS-092	Production test software

Acceptance checks

Test	Acceptance intent
HIPOT and electrical safety	Meet the applicable insulation earth and mains safety limits
Power supply	Confirm a correct 24 V output and sound terminations
Loop card data	Confirm that RS485 radar data is present at connector J14
Configuration read and write	Confirm configuration can be written and read through the RJ45 configuration port
Uplink data	Confirm radar data can be read from the uplink RJ45 port

Handling a failure

A failed unit follows the controlled fault-finding checklist in TWI-176. Record the test result, diagnosis and corrective action, then repeat the full required test sequence before the unit is released.

Applies to RMAS Interface Box production assurance for the National Highways MIDAS system

Source TAN53 issue 1 27 February 2026