TransCore MPRX Series - Page 41

Boot Failure Message
Upon powering up, the software performs a checksum verification on itself. The function returns a specific
value for the particular version of software. If the value returned is not correct, the boot code assumes that
the application code has been corrupted and a failure condition exists. If the failure message does not
transmit, a communications error has occurred or the boot has failed to the extent that it cannot transmit the
failure message.
If the failure message version number equals 0.00 and no serial number exists, the flash memory
checksum has failed, and the MPRX is operating out of boot ROM. In this case, the MPRX automatically
enters download mode and waits for a new program to be loaded into the flash memory. Contact
TransCore Technical Support for assistance.
Tag/Message Buer
The MPRX maintains a tag buer in battery backed RAM to save tag IDs acquired when data inquiry
protocol is used. This buer holds up to 500 time-stamped messages.
Note: When the buer fills, subsequent tag IDs will be lost.
Chapter 3 General Software Information
TransCore Proprietary
3–41