The TXB-N forces and update to the Spectra IV dome firmware so that the TXB version is compatible with the Spectra IV dome version. In some cases this will take the Spectra IV dome firmware to a lower version of firmware then what was in it.
The TXB-IP does not force an update to the Spectra dome firmware.
When installing a TXB-N or updating a TXB-N to a Spectra IV dome.
This is to make the firmware version of the Spectra IV dome compatible with the version of the TXB-N. This will list which TXB version update the spectra dome and to what Spectra firmware.
The following TXB-N versions update the Spectra IV versions:
The TXB-N versions below 1.7.0 do not update the Spectra IV dome firmware
TXB-N versions 1.7.0 up to 1.7.21 will update the Spectra IV dome firmware to 2.200
TXB-N versions 1.7.22 to 1.7.31 will update the Spectra IV dome firmware to 2.201
TXB -N versions 1.7.32 to 1.7.41 will update the Spectra IV dome firmware to 2.400
TXB-N versions 1.8.2 and newer will update the Spectra IV dome to 2.502