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GPS2 / InstallingTheGPS2

Installing the GPS2

Quick Checklist

  • Attach the supplied GNSS antenna to “GPS In” on the rear of the unit.
  • If using with a SPEEDBOX, connect “GPS Out” on the GPS2 to “Rf 1” on the SPEEDBOX.
  • If using with a SPEEDBOX or CATS system, attach “Serial 1” on the GPS2 to “Serial 1” on the SPEEDBOX and (CATS only) “Serial 2” on the DL2.
  • If using GSM corrections, insert a SIM card and attach a GSM antenna to “GSM” on the GPS2.
  • If using Base station corrections, attach a radio modem configured at 38400 baud to “Modem” on the GPS2.
  • Supply 12V power to the GPS2.
  • Configure the GPS2.

Full Instructions

Installing the GPS2 as a standalone unit

The simplest installation is of the GPS2 as a standalone unit:

The GPS2 will be supplied with a suitable GNSS (GPS + GLONASS) antenna; this must be connected to “GPS In” on the rear of the GPS2. If the GPS2 is to receive GSM corrections, then a SIM card must be inserted into the rear of the GPS2, and a GSM antenna must be attached to “GSM” on the rear of the GPS2.

NOTE: A GSM antenna should always be attached when the GPS2 is configured to expect GSM corrections, since the GSM module will expect an antenna. If the antenna is removed then ensure that the GPS2 is reconfigured in a non-GSM mode.

If the GPS2 is to receive base station corrections, then attach the supplied radio modem to the “Modem” port on the rear of the GPS2. If using a third party radio modem, ensure that its serial output is configured to run at 38400 baud, since this is the baud-rate of the GPS2 modem port.

To receive CAN data, attach a CAN cable to “CAN” on the front of the GPS2. The cable must contain termination if required, since the GPS2 does not contain internal termination.

Connect 12V power to the rear of the unit using the supplied cable.

Configure the GPS2 through either the USB port (recommended) or “Serial 2” on the front of the GPS2. Both of these ports run at 115200 baud. Full configuration instructions can be found here

Installing the GPS2 with a SPEEDBOX or SPEEDBOX-INS

The typical installation of the GPS2 will be with a SPEEDBOX or SPEEDBOX-INS, either alone or as part of a CATS system with the DL2 datalogger.

To install the GPS2 with the SPEEDBOX, the two units can be attached and separated using the supplied connecting pieces, and 4 allen screws per unit. The standard arrangement is for the SPEEDBOX to be above the GPS2 (the stacking order does not matter when only a GPS2 and SPEEDBOX are used, but when a DL2 is added the cabling is simplified if the recommended stacking order is used, so we recommend always stacking the SPEEDBOX above the GPS2).

The main GNSS antenna attachment remains to the GPS2, but the SPEEDBOX also needs GNSS input in order to accurately time its inertial data and external inputs. Hence a short GPS connector cable is supplied and must be used to connect “GPS Out” on the GPS2 to “Rf1” on the SPEEDBOX.

The main output from the GPS2 to the SPEEDBOX uses RT message 109 (high precision GPS data message) over serial. Hence “Serial 1” on the GPS2 must be connected to “Serial 1” on the SPEEDBOX using a NULL modem cable (a suitable short NULL modem cable will be supplied). The Serial 1 output from the GPS2 is set at 460800 baud, and hence the SPEEDBOX configuration must be checked to ensure that the SPEEDBOX is configured to run its Serial 1 at 460800 baud.

The power can be connected to either the GPS2 or the SPEEDBOX, since power is shared between the units by the serial connection, as long as a Race-Technology supplied lead is used.

Installing the GPS2 with a CATS system.

Full instructions and diagrams for installing the GPS2 with a Race-Technology CATS system can be found here.

Page last modified on February 26, 2020, at 12:21 PM