Softload

Chapter 13

Softload

The optional softload feature lets you download new software into the TA through the local DTE port. The new software is stored in nonvolatile flash-programmable read-only memory devices (PROMS) and is retained even when the unit is powered down. This allows software updates and new features to be added to the TA without physically removing the unit from service.

The new software files are downloaded into the TA from the customer’s host computer using the YModem-G file transfer protocol. Password protection prevents unauthorized software changes.

Note: If the softload feature is not present, the %P1, $Q, $Y=x, $Y2=x, and $T=x commands will return an ERROR message.

The softload feature does not interfere with normal TA operation, except for the swap command. While the softload is in progress the TA remains fully operational.

TA SOFTWARE ARCHITECTURE

The concepts of sets of software and how the TA’s Central

Processing Unit (CPU) use them are described below.

Software Sets

The TA has two sets of operational software: the active set and the alternate set. The TA operates from the active set and performs software downloads into the alternate set.

A swap command allows the user to swap software sets at any time. The active software becomes the alternate software, and vice versa. This swap also allows the unit to return to its previous version of software. The active software set selected is stored in a separate nonvolatile memory location and is retained even after powering down the unit.

Swaps to invalid software are prevented. If a power-up occurs in an invalid set of software, the TA automatically swaps to the alternate set of software.

Software Format

Updated software for the TA is provided on a standard PC-compatible 5.25” high-density floppy diskette. The host computer can be a PC on any other system capable of reading PC-formatted floppy disks and transferring files via YModem-G.

UTA220/UTA220k

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Northern UTA220/UTA220k manual Chapter Softload, TA Software Architecture, Software Sets, Software Format