Product overview and where it fits
The SimtoLink cold-chain vehicle wireless RTU brings several temperature and humidity channels, door contacts, and a GPS track together. In a tunnel or on a remote stretch it caches locally and retransmits when the link returns. Wide-range vehicle power and vibration-resistant connectors are built for box trucks and refrigerated vehicles.
The platform can set geofences and over-temperature chain alarms, which covers GSP traceability and audit for pharmaceutical and food cold chains. SimtoLink supplies probe-placement notes, a probe calibration interval, and a sample driver SOP.
Reliability on site
For electrical safety and EMC, the RTU has passed the relevant CCC items. Ports include surge and reverse-polarity protection. Reinforced grounding and a partitioned layout reduce ground loops and common-mode noise. Outdoor or coastal sites can take a higher ingress rating and a corrosion-resistant coating.
Parameters can be loaded in batches, thresholds can be set, and the unit can keep event video or waveform records, depending on the model. Configuration and firmware go out by OTA. On site, close acceptance in three steps: a power-on self-test, clock sync on the link, and a spot check of samples. For metering or safety duty, SimtoLink helps submit the unit to a third-party metrology institute and supplies the type-test file.
Key hardware parameters
The figures below are the typical build of this RTU, for selection and for the technical clauses in a bid. A wider range, redundant power, or an intrinsically safe variant is available from SimtoLink with the Hardware Specification and the Installation and Commissioning Guide. Order codes in the family can differ slightly; the nameplate and the papers shipped with the unit govern.
| Parameter | Specification | Notes |
|---|---|---|
| Telemetry / indications | 32/64 | Configurable point list |
| Control / setpoints | 8/4 | Checkback |
| Uplink | Dual-SIM 4G | Active/standby failover |
| Downlink | CAN | Isolated |
| Supply | Lithium backup | Retained on power loss |
| Clock | GPS time sync | SOE 1 ms |
| Ingress | IP20 inside a cabinet | Lightning class III |
| Safety | IEC 61010 | Type test |
| MTBF | >50,000 hours | Room temperature |
| Mounting | Pole mount | Anti-theft lock |
Typical deployments
Four layouts that show up often enough to use in a scheme review and a payback check:
Pharmaceutical wholesale and vaccine delivery
The full temperature curve and every door opening are kept so they cannot be denied, ready for an unannounced inspection.
Fresh-grocery city delivery
Multi-stop unload tracks and zoned cargo temperatures cut complaint disputes.
Central kitchens
Raw materials and finished goods are watched in transit, and the record meets the store's scan-on-receipt check.
Third-party cold-chain fleets
Data from many vehicles is grouped by waybill, and shippers get a de-identified query interface.
Installation, grounding, and upkeep
- Before applying power, confirm the supply range and polarity. If there is any doubt, measure bus voltage and breaker capacity with a multimeter.
- Run the communications cable as shielded twisted pair, grounded at one end only, and do not lash it to high-power cables over a long route.
- For the first go-live, prove read and write in both directions and the threshold triggers against the platform in the lab, then move the RTU to site.
- Outdoors, give drainage and ventilation first priority, inspect the sealing faces on a regular round, and keep the lightning earth resistance inside the local code.
- In continuous service, spot-check samples and archive logs every 12 months.
Ordering, documents, and support
SimtoLink provides the hardware specification, an outline drawing, a wiring table, and a sample project. Volume orders can include a sample review and inspection at the factory. Warranty and calibration follow the contract and the documents that ship with the RTU.