Manual revision 001
Section 3: Preparing SBE 39
plus
-IM for Deployment
SBE 39
plus
-IM
26
Power and Communications Test and Setting SBE 39plus-IM IDs –
Using IM Communications and Remote Surface Inductive Modem (SIM)
The power and communications test will verify that the system works,
prior to deployment. This section covers use of the SBE 39
plus
-IM with a
Surface Inductive Modem (SIM)
.
Test Setup with SIM
1.
Loop insulated wire through the 39
plus
-IM’s modem coupling core to
simulate a mooring cable. Connect the test wire ends to the SIM’s
mooring cable terminals (JP4). (See
Appendix III: SIM Hookup
and Configuration
.)
2.
On the SIM, remove the jumper on J5 (see
Appendix III
). This inserts a
1K resistor in series with the inductive loop and reduce signal amplitude,
preventing 39
plus
-IMs that are near but not attached to the inductive loop
from responding to commands (especially important when sending
*ID=
).
3.
The 39
plus
-IM requires a minimum of 20 ohms impedance.
4.
Connect the SIM to a 7-25 VDC power supply. A maximum of 30 mA is
required.
Do not turn on the power supply yet
.
5.
Connect the SIM to your computer’s serial port using the 9-pin to 9-pin
cable supplied with the SIM.
Note:
For testing and setup, an ICC is not
required, even if using SIM-Coupled.
Notes:
•
If more than one IM instrument
is on-line when you set the ID,
all IM instruments will be set to
the same ID.
The inductive
modem receivers in IM instruments
are very sensitive; two IM
instruments that are side-by-side
will take the same ID, even if one
of them is not on the IM loop.
Therefore, separate IM
instruments by at least 2 meters
when setting IDs.
•
Important! For Normal Deployed
operation, reinstall the jumper
across J5.
Note:
Sea-Bird ships the 39
plus
-IM with
four AA lithium cells installed. See
Replacing AA Cells and Desiccant
in
Section 5: Routine Maintenance and
Calibration
to replace the cells.
To Computer
Serial Port
Surface Inductive
Modem (SIM) PCB –
SIM-Direct
or
SIM-Coupled
To Power
Supply
Test wires to JP4
Insulated wire looped
through modem
coupling core
Inductive Modem Instrument
(37-IM shown; 39plus-IM connection similar)