Northern UTA220/UTA220k - Manual (Page 118)

13-8
UTA220/UTA220k
Softload
Swap to Alternate Software: $T=x
The $T command initiates a swap to the alternate set of
software. If successful, the alternate software becomes the
active software, and vice versa. The TA will automatically
perform a reset to reinitialize the new software after the swap.
A softload password must be provided with the $T command.
If the password does not match the unit’s stored password, the
TA will return an ERROR message.
Before the TA attempts the swap, it first verifies that the
alternate set of software is valid. An extensive set of tests must
be passed during and after softloading. In order for the TA to
allow a software swap the following conditions must be met:
• The previous software load was complete and successful.
• The software is loaded in the correct format.
• The software is for the correct product.
• The software version information is correct.
• The checksum of the software matches its stored checksum
value.
If any of the above conditions is not met, then the alternate
software is marked as invalid and the TA returns the ERROR
message. If all verification checks pass, it returns OK and
proceeds with the swap. The swap forces the TA to reset and
reinitialize with the new software; this takes about 10 seconds.
Note that the OK message is returned before the swap and reset
are performed; to verify that the swap was actually successful,
use the $Q command to request the software version.
When the swap command is executed, the TA automatically
stores the selection of active software in nonvolatile memory.
Note: Depending upon the changes implemented in the
software, one or more parameters in the TA’s stored profile
may be reset following a swap command.
TYPICAL LOCAL SOFTLOAD SESSION
The following example demonstrates a typical softload session
form a local host. The host computer in this example is a
PC-compatible computer running a typical communications
package.
The steps in performing a softload transfer and swap are:
1. Check the distribution floppy diskette that contains the file
to be downloaded. There should be a file called
README.TXT that describes the software contained on the
floppy and gives the name of the actual softload file. Normally,
softload files for the UTA220 are named UTA220.SL.