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GPS2 / OutputDataFormat

GPS2 Output Data Formats

The GPS2 outputs both CAN and Serial data, as detailed below.

CAN Output

The SPEEDBOX can output a variety of CAN messages, using Race Technology’s CAN data message format. The rate at which each message is output is configurable, at up to 20Hz for each message.

A detailed description of the Race Technology CAN data format, including the message contents and the default addressing scheme, can be found on the knowledge base on the Race Technology web site here. A CANdb (.dbc) file is available to aid message decoding, and can be downloaded from our website here. If the CAN addresses are changed from the default settings, the default CANdb file will no longer decode the messages, but a custom .dbc file can be exported from the configuration software instead. The GPS2 supports both 11 and 29bit addressing, Bitrates are configurable to 125kbps, 250kbps, 500kbps or 1mbps.

CAN output can be configured to be either as soon as available, in which case the latency will be variable, or at a fixed latency of 150ms. This applies to the reception of the first message of each epoch, relative to the epoch time. Latency can only be guaranteed if the GPS2 is the only transmitter on the CAN bus.

The following CAN messages are available for output from the GPS2:

Serial Output

The GPS2 has 3 serial and 1 USB ports. Usage and baudrate is summarised in the table below:

Port Baudrate Function
Serial 1 460800 Connection to SPEEDBOX
Serial 2 115200 Configuration / reflash
Serial “Modem” 38400 Differential corrections
USB 115200 Configuration / reflash

Serial 1 is used to output serial data to other Race Technology equipment, such as the SPEEDBOX-INS. It is fixed at a baudrate of 460800 baud. The output data format is 109-Complete High Precision GPS Solution Data

Serial 2 and the USB port are used for configuration and/or reflash. They are fixed at a baudrate of 115200 baud.

The rear serial port (labelled “Modem”) is used to input or output RTCM v3.x differential correction data, and is fixed at a baudrate of 38400 baud.

Page last modified on February 27, 2018, at 02:55 PM