# DIDCOM TPM: Wired Temperature Monitoring for Multi-Compartment Refrigerated Trucks

Some cold chain contracts want a wired probe in each compartment, calibrated, with a record that would satisfy a pharmaceutical or food-safety auditor. DIDCOM Temperature Monitoring is the wired option: industrial probes per compartment, connected to the GO device, logging continuously with the trip. Here's when to choose it over Bluetooth pucks.

Source: https://www.highpointgps.com/resources/didcom-tpm-wired-temperature-monitoring
By Stefano Mazzone, IT Technical Support Specialist — published 2026-09-18, updated 2026-09-18

## Wired Versus Wireless

Bluetooth pucks are the easy way to monitor a load: no wiring, ten-year battery, drop it in the tote. They sample on an interval, they depend on a radio link, and they are not calibrated instruments. For most food and beverage distribution that is fine. For a multi-compartment truck under a contract or a regulation that specifies continuous, calibrated monitoring per compartment — pharmaceuticals, certain meat and seafood programs, hospital and laboratory logistics — the wired option is the one the auditor expects. DIDCOM TPM is that option.

## What It Is

Industrial-grade temperature probes, one per compartment, wired to a controller that connects to the GO device through the IOX port. The probes are calibrated, the sampling is continuous, and the readings go to MyGeotab with the vehicle's position and time as individual data streams per compartment. Alerts fire when a compartment leaves its band, with escalation to the driver's device and the dispatcher; the per-trip log is the delivery record, and it survives out-of-coverage stretches because the controller buffers.

## What the Record Supports

Customer proof-of-condition at delivery, with the compartment's temperature at the moment the geofence was entered. Rejected-load disputes, where the fleet's continuous record against the customer's dock thermometer settles who cooled what. HACCP and pharmaceutical good-distribution-practice documentation, where a calibrated, continuous, tamper-evident record per compartment is the requirement. Reefer performance, where a compartment that struggles to hold setpoint on hot afternoons shows up before the load is lost.

## Installation

Probes are run into each compartment and the controller is mounted and connected to the GO device by an installer; calibration certificates are kept with the vehicle record. High Point GPS installs DIDCOM TPM and builds the compartment reports and alerts for cold-chain carriers in Quebec, Ontario and the northeastern US.

## FAQ

### What is DIDCOM TPM?

A wired temperature monitoring system with calibrated industrial probes per refrigerated compartment, connected to the Geotab GO device, logging continuously with the trip.

### When should I choose wired over Bluetooth pucks?

When a contract or regulation requires continuous, calibrated monitoring per compartment, such as pharmaceutical distribution or certain food-safety programs.

### How many compartments can it monitor?

Multiple compartments per vehicle, each with its own probe and its own data stream in MyGeotab.

### Does it record out of coverage?

Yes. The controller buffers readings and delivers them when the connection returns.

### Are the probes calibrated?

Yes. Calibration certificates are supplied and kept with the vehicle record for audits.

## Sources

- [Geotab Marketplace](https://marketplace.geotab.com/)
- [Canadian Food Inspection Agency: Safe Food for Canadians](https://inspection.canada.ca/en/food-safety-industry)