Sequoia LISST-100X, Руководство пользователя

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124 LISST-100X User’s Guide
that makes it difficult to connect to the serial port, either directly if it exists or via a USB-
serial adapter if no serial port exists. If you are using a DELL computer, check on DELL’s
website (
www.dell.com ) if a BIOS upgrade is available for your particular model. If an
upgrade is available, download and install it and try connecting again before proceeding
further. It is not known if this problem also exists for computers from other manufacturers.
3) If possible, connect directly to an actual serial port (i.e. do not use a USB-Serial adapter
unless absolutely necessary) and check if this makes a difference.
4) Close the LISST-SOP and open up the MOTOCROSS program. This program is located
in the LISST100 directory on your computer (motocross.exe). Be sure that the selected
communication port is correct and that its settings are correct.
5) Check the connectivity of the communication cable. You will need 2 paperclips and a
voltmeter. You also need to consult the connector diagram for the 5-pin connector, both the
male bulkhead connector and the cable end (see Appendix C: Connector Pinouts for
LISST-100X on page 108). Make sure that the cable is connected to the serial port of the
PC and proceed as follows:

Check the voltage between pins 1 and 2 on the communication cable. You may need
the paperclips to extend the measuring pins of the voltmeter to make a proper contact
inside the cable. The voltage should read 12 V. If it does not, the cable may be
defect.

Short the female pins 4 and 5 on the communication cable using one or both
paperclips. Type some characters into MOTOCROSS. They should appear on the
screen. If they do not, the cable may be defect.

Measure the voltage between pins 3 and 4 of the male bulkhead 5-pin connector on
the LISST-100X. The voltage will be 0 most of the time, and should spike to between
-5 to -9V every 2 minutes for about 2 seconds. It can be challenging to maintain
contact for 2 minutes, so take care to ensure constant contact, and then watch the
voltmeter continuously.
6) Remove the end cap, and disconnect the main battery. Measure the battery voltage on
the main battery. It should be above 6V and close to 9V for a new battery. If it is below 6V
replace the battery and try again.
7) Locate test point TP2 (minus) and P12 (plus) on the connector endcap board. Measure
the voltage between the 2 test points. This voltage should be the same as for the battery.
8) Locate the right hand side of D2 and measure the voltage between the right side of D2
and TP2. Voltage must be present.
9) If there is still no connection, contact your local distributor or Sequoia directly at
info@sequoiasci.com . Be sure to include your full contact info as well as instrument serial
number. It is also useful for us to know when was the last time you talked to the instrument
and what the instrument has been doing since last time you talked to it (e.g. in storage,
deployed in the field, shipped to another location etc.). Also let us know the results of each
of the tests above.