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Add info about RTCM GPS connections and connecting uBlox GPS modules.
The firmware is specifically written to talk to Trimble Thunderbolt receivers using Trimble's TSIP binary data interface, however, other Trimbles GPS receivers that talk TSIP are generally compatible.
The firmware is specifically written to talk to Trimble Thunderbolt receivers using Trimble's TSIP binary data interface, however, other Trimbles GPS receivers that talk TSIP are generally compatible.
==RTCM GPS Connections==
There are some quirks specific to the RTCM that are not well documented.
The GPS connections for the RTCM are on the DB15 connector. Note that the labels for GTX and GRX are misleading. GTX is the data '''FROM''' the GPS '''TO''' the RTCM (GPS TX/RTCM RX). GRX is data from the RTCM to the GPS, but that is currently not used, so it does not need to be connected.
PPS is obvious, that is your PPS signal from your GPS.
Also note, inside the RTCM, there are jumpers to set for TTL or RS-232 data, depending on the type of GPS you are connecting. Set them accordingly. The RS-232 setting loops the data through a MAX3232 converter on the board.
You will still need to set the data and PPS polarity, and baud rate in the configuration menus to get everything to work.
We have added a brute-force fix starting in RTCM/VOTER firmware >=1.51. This fix adds 619315200 seconds (1024 weeks) to the time reported by the GPS. It fixes the Thunderbolts, we have not done extensive testing to see how it affects other TSIP receivers.
We have added a brute-force fix starting in RTCM/VOTER firmware >=1.51. This fix adds 619315200 seconds (1024 weeks) to the time reported by the GPS. It fixes the Thunderbolts, we have not done extensive testing to see how it affects other TSIP receivers.
===Garmin===
===Garmin===
# File > Save to a different file than step 5.
# File > Save to a different file than step 5.
# Press F9 or Config > Send Configuration to GPS. This will then send all the changes you made to the GPS unit (including baud rate so a reconnect may be needed)
# Press F9 or Config > Send Configuration to GPS. This will then send all the changes you made to the GPS unit (including baud rate so a reconnect may be needed)
===uBlox GPS===
You can use uBlox GPS modules with the VOTER/RTCM. The ones readily available usually have a 5 pin header on them (5V, GND, TXD, RXD, PPS), as well as an integrated patch antenna, and a SMA connector for an external antenna.
Data is TTL, so make sure to set the jumpers inside the RTCM for TTL data. Baud rate is 9600 by default, and uses NMEA. Set those accordingly in the configuration menu.
The RTCM and VOTER require different settings for data and PPS polarity. The VOTER wants '''inverted''' for both, and the RTCM wants '''non-inverted''' for both.
Make sure to save (99) and reboot (r) your VOTER/RTCM after making changes for them to be effective.