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4 Firmware Integration
32 Trimble ThunderBolt E GPS Disciplined Clock User Guide
Firmware configuration
The ThunderBolt E maintains its configuration parameters in a non-volatile memory
device (EEPROM). In the EEPROM, related configuration parameters are grouped
together and stored in an area known as a “segment”. There are seven
user-configurable segments. Immediately after a reset, the ThunderBolt E reads the
segment contents from the EEPROM, stores a working copy in RAM and then
configures itself based on the working copy of the segments. You can do the following:
• To modify the contents of the working copy, use the “Set” command packets.
• To read the working copies of the segments, issue the “Request” command
packet and wait for the “Report” packet response.
When you alter a parameter, the ThunderBolt E reconfigures, but the contents of the
EEPROM are not changed automatically.
The ThunderBolt E has two command packets that can control the contents of the
segments stored in EEPROM:
• Command packet 0x8E-4C enables you to save the contents of any or all
working copies of the segments to EEPROM.
• Command packet 0x8E-45 enables you to set the contents of any or all the
segments stored in EEPROM to the factory default.
Firmware upgrades
When firmware upgrades are available, Trimble will provide software and instructions
for installation on the Trimble website at www.trimble.com/timing.
Firmware features
The firmware includes:
• Kalman filtering for better performance during holdover.
• 1 PPS calibrated to the USNO master clock for a more accurate “out of box”
performance.
• New position integrity monitor that warns you if the receiver is using an
incorrect position.
• User-selectable recovery algorithm that enables you to define how the clock will
recover from holdover.
• Silent TSIP options that enables you to choose which packets, if any, are to be
reported.