R-Pro › Field cases › Transport refrigeration
GPS / Remote Monitoring Communication Loss
Likely causes
Unstable vehicle power — voltage drops below 6V during refrigeration startup causing repeated communication module restarts
Check: Measure communication module supply voltage after ignition: normal 11–14.4V DC — record minimum during refrigeration startup and check if below 6V
What to do: Add battery isolation relay or DC-DC converter → dedicate separate power line for communication module → compare communication loss timestamps with refrigeration startup times
Physical damage to GPS/LTE antenna or poor connection
Check: Visually inspect GPS/LTE antenna cable connector → check antenna for cracks or breaks → verify antenna is not buried inside metal vehicle structure
What to do: Detach and reattach antenna cable connector → replace damaged antenna → relocate antenna to exposed position on vehicle roof exterior (away from metal structures)
SIM card dislodged or data plan expired
Check: Check SIM card insertion status → verify data plan is active → check APN setting accuracy
What to do: Re-insert SIM card → renew data plan → reconfirm APN settings and update firmware to latest version
If communication loss timestamps match refrigeration unit startup times, voltage drop is the cause — resolve by adding a battery isolation relay or DC-DC converter.
All 565 cases work offline in R-Pro, with error codes for 62 brands and P-T data for 108 refrigerants.
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