The ONE20 F-ELD is a PT30 ELD. The PT30 is an Electronic Logging Device (ELD) that supports the implementation of the Federal Motor Carrier Safety Administration (FMCSA) Hours Of Service (HOS) rules. The ELD connects with the vehicle it is supposed to monitor using the diagnostic port interface. The diagnostics port provides data using the J1939 protocol running at 250 or 500 kbps. The diagnostic port also supports an always on power source that powers the ELD.
The PT30 uses a single external interface. The interface is a 10-pin connector Molex Micro-Fit 3.0™ P/N 43650-1012. The mating connector is the Molex 0436451000. Pacific Track has approved the substitution of the Molex connector with other brands that have met a series of tests conducted internally.
The pinout of the connector is specified in this table:
|1||+V||+8 to +30 V|
|7||UART RX (to PT30)||+3.3V input compatible 5V|
|8||UART TX (from PT30)||+3.3V output|
|9||IGNITION||+8 to 30V|
|10||RELAY OUT||Open-drain, 5 Amps max|
The PT30 includes one RED and one GREEN LED. The LEDs are visible through a single light pipe on the side of the enclosure.
This table summarizes the functionality of the RED LED:
GPS power management engaged
GPS is turned off
GPS backup clock is ON
|Blinking||GPS is in acquisition mode|
|On||GPS signal is locked|
Note: The GPS goes into power management mode when the PT30 detects that the vehicle is not moving. The GPS is periodically turned on to refresh the lock.
The following table summarizes the functionality of the GREEN LED.
|Off||Device is not plugged in|
Device is powered
Vehicle bus not detected
Bus activity detected
Device is registering
|On||Device is registered on the vehicle bus|
Note: The GPS goes into power management mode when the PT30 detects that the vehicle is not moving.
The PT30 is powered with the following internal circuitry.
The circuit provides the following benefit:
- Protected against reversed polarity with diode D (40V, 3A)
- Protected against over current with the 500mA resettable fuse PF
- Filtered against noise present on the power line with capacitor C
- Protected against the overvoltage/overshoot present in the automotive environment with the Transient Voltage Suppressor TVS which has a peak power dissipation of 1500W
The circuit has been tested to meet the requirements of ISO 16750-2.
All the components not listed in have an operating temperature range of -40°C to +85°C or better. The only exceptions are the two LEDs that have a low temperature range of -30°C.
The table below lists all the critical components.
|Part Number||Manufacturer||Function||Temperature Range|
|MCP2562T-E/SN||Microchip||IC TXRX CAN||-40°C ~ 125°C|
|SN65176BDR||TI||IC 1/1 Transceiver Half RS422, RS485||-40°C ~ 105°C|
|W25Q128FVSIG||WINBOND||FLASH 128MBIT 104MHZ||-40°C ~ 85°C (TA)|
|NRF51822-QFAC||Nordic Semiconductors||IC BLE 256KB FLASH 32KB RAM||-25°C ~ 75°C|
|STM32F103RCT6||STMicroelectronics||IC MCU 32BIT 256KB FLASH 48K RAM||40°C ~ 105°C (TA)|
The PT30 includes a u-blox MAX-8C module. The MAX-8C module is a single global navigation satellite system (GNSS) receivers that can receive and track either GPS or GLONASS signals. In the PT30, only the GPS constellation is enabled. The MAX-8 modules support reception of SBAS broadcast signals. These systems supplement GPS data with additional regional or wide area GPS augmentation data. The system broadcasts augmentation data via satellite and this information can be used by GNSS receivers to improve the resulting precision. SBAS satellites can also be used as additional signals for ranging (navigation), further enhancing availability. The following SBAS types are supported: WAAS, EGNOS, and MSAS. For applications within North America (initial market for the PT30), the MAX-8C will use the WAAS constellation to improve the accuracy of the position.
The u-blox 8 modules use GNSS chips qualified according to AEC-Q100 and are manufactured in ISO/TS 16949 certified sites. Qualification tests are performed as stipulated in the ISO16750 standard: “Road vehicles – Environmental conditions and testing for electrical and electronic equipment.”
|Cold Start||30 s|
|Hot Start||1 s|
|Tracking & Navigation||-164 dBm|
|Cold Start||-147 dBm|
|Hot Start||-156 dBm|
Module Operating Conditions
- Storage temperature: -40° C to 105° C
- Operating temperature: -40° C to 85° C
Pacific Track has approved using the MAX-M8-C module in replacement of the MAX-8C. The MAX-M8C is electrically and mechanically identical to the MAX-8C, but it supports receiving and decoding multiple GNSS constellations simultaneously.
The GNSS circuitry inside the PT30 includes the following components:
- A patch antenna, 25 mm2 with 4.5 dBic gain
- A low noise amplifier (LNA) with a gain of 21.0dB and a noise figure of 0.65dB
- The MAX-8C module
The actual implementation of the GNSS subsystem has been reviewed by u-blox and their suggestions have been included in the design.
The flash device used is in the PT30 is specified for more than 100,000 erase/program cycles and 20-year data retention. If a file system (such as FAT16 or FAT32) is installed on such a device, some memory blocks might be erased and programmed more often than others. This, for example, may apply to the blocks containing the File Allocation Table (FAT).
To increase the reliability of the product, the PT30 file system implements wear leveling. Wear leveling spreads the writes to the flash chip evenly over the entire area. This extends the life time of the chip.
The file system also implements journaling. Journaling protects the file system data structures and prevents them from being corrupted. Even if a write is interrupted by something like a power loss.
The PT30 is designed and will be tested to be compliant under 47 CFR FCC Part 15.247. The product must meet the limits set by the following individual test: