All digital tachographs have a K-Line connection on pin 8 of the D-sub connector (D8 pin). The current tachograph data is transmitted via this connection and describes the current state of the tachograph, driver and the vehicle itself. This data is also transmitted when the vehicle is switched off, making it possible to detect tachograph activities if the driver changes his status when the vehicle is powered down. The Squarell SOLID-K and REMOTE include a K-Line connector that can be used to connect to the D8 pin of all VDO, Stoneridge and Actia digital tachographs to read the current tachograph data.
The parameters supported by K-Line are:
- Work State of Driver 1 and 2
- Driver ID or Driver 1 and 2
- Driving Time Exceeded Warnings Driver 1 and 2
- Card Present
- Date and Time
- Tachograph Vehicle Speed
- Odometer
- VIN
- Vehicle Registration Number
| Function | Order code | Remark |
|---|---|---|
| Work status Driver 1 (actual per second) | Standard | FMS interface with CAN input |
| Work status Driver 2 (actual per second) | Standard | |
| Driving time exceeded warnings Driver 1 | Standard | |
| Driving time exceeded warnings Driver 2 | Standard | |
| Card present 1 | Standard | |
| Card present 2 | Standard | |
| Tachograph vehicle speed | Standard | |
| Tachograph date and time | Standard | |
| Tachograph data at ignition off | Standard | Only with K-Line D8 connect |
| Driver ID | Standard | Only with K-Line D8 connect |
| Tachograph direction 0=forward 1 =reverse | Standard | Only with K-Line D8 connect |
| Tachograph performance | Standard | Only with K-Line D8 connect |
| Tachograph handling info | Standard | Only with K-Line D8 connect |
| Tachograph event | Standard | Only with K-Line D8 connect |
What is a tachograph?
A (digital) tachograph is a device fitted to a vehicle that automatically records its speed and distance, together with the driver’s activity selected from a choice of modes: the drive mode is activated automatically when the vehicle is in motion and modern tachograph heads usually default to the other work mode upon coming to rest. The rest and availability modes can be manually selected by the driver whilst stationary.
Regulations vary from country to country
For reasons of public safety, many jurisdictions have limits on the working hours of drivers of certain vehicles, such as buses and trucks. A tachograph can be used to monitor this and ensure that appropriate breaks are taken. Drivers and their employers are legally required to accurately record their activities, retain the records and produce them on demand to transport authorities who are in charge of enforcing regulations governing drivers’ hours of service.
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