Inside the DM24
recognised by constant extreme values of the pwm parameter as reported in
the status stream. A physical repair of the DM24 is required in this case.
•
Some Trimble Lassen GPS receivers would announce a time which was
exactly one second out for a minute or so after power up. This is because
they used a hard-coded value for the leap-second offset (see section 7.2.2 on
page 100) until the actual offset value was received from the satellites. When
used in GPS power-cycling applications, this would cause the symptoms
described (with a particularly fast escalation) because the DM24's software
clock would need to jump one second backwards every receiver power-cycle
and then one second forwards again each time once the offset was corrected.
The solution in this case is to disable GPS power-cycling or replace the GPS
receiver with a modern version.
7.3 Updating firmware
7.3.1 Updating firmware using an EAM, Affinity or NAM
The easiest way to update the digitiser firmware is by connecting it to a Platinum
device, such as an EAM, Affinity or NAM. If the digitiser is part of a DM24-S
x
EAM or
integrated *TDE instrument, this connection is already made.
The DM24 firmware can be upgraded through the web interface, using a check-box at
the bottom of the data acquisition configuration page, or from the command line,
with the
dm24-upgrade
command. Please see the platinum manual, MAN-EAM-
0003 for more details.
7.3.2 Updating firmware with Scream!
You can update the digitiser firmware using any terminal program which supports
the Xmodem protocol, such as
minicom
,
ExtraPuTTY
or Scream!. If you are not using
Scram, open a terminal to the output of the DM24 and key
+
a few times
until you see the
ok
prompt. If you are using Scream!, simply right-click on the
digitiser’s icon ( ) in the main window and select
Terminal
from the pop-up menu:
103
Issue U - December, 2021
