Stevens SatComm GOES Installationsanleitung
Stevens SatComm
FAQs
For use with SatCommSet or Terminal Setup programs
Q. What are the channel assignments for On Air Test Mode?
A. The assigned GOES test channels are as follows:
GOES West 300 Baud: Channel 196
GOES West 1200 Baud: Channel 499 (look for it on channel 200)
GOES East 300 Baud: Channel 195
GOES East 1200 Baud: Channel 497
Q. Why do the LEDs go all the way out? I can’t tell if the unit is powered.
A. When SatComm is OnLine, it is in low-power standby mode waiting for the schedule transmission time or for
a Random transmission sequence. For optimum lowest power, the LEDs, which draw current, are turned off to
conserve batter life. LEDs come on during a Timed or Random transmission sequence, or when the unit is in Off
Line mode.
Q. Why can’t I go Online until I have a GPS lock?
A. We designed SatComm using a GPSDO (GPS disciplined oscillator) instead of an expensive and fault-prone
OCXO. Because of this, the frequency stability is only ensured when there is a GPS lock. We make sure we have a
frequency and time lock before going online. After the first initial GPS lock, the SatComm calibrates the internal
RTC (real time clock) using the GPS acquired time and fixes the frequency so that it can continue transmitting
within its channel assignment in the absence of GPS signal for up to 24 hours. Normally, a GPS lock is obtained
every time the SatComm turns on for a scheduled transmission. Not getting a GPS lock is rare, and is a function of
good GPS antenna placement.
Q. Why is it taking so long to get a GPS lock?
A. It can take up to 15min, depending on the part of the world that the SatComm unit was shipped to, for the GPS to
receive all the almanac data from the GPS satellites. It is a good idea to allow the SatComm unit to stay in Off Line
mode, with a GPS antenna connected, until a GPS fix is achieved before trying to go online.
Q. Why can’t I connect with the GUI?
A. There are a couple of reasons you may not be able to connect with the GUI:
1. In order to connect using the GUI, the SatComm needs to be in the Off Line Menu state (from the
terminal program). If the unit was left in another menu (I.E. System Setup), then the GUI will not
connect. You can either navigate back to the Off Line Menu or you can cycle the power to the unit.
2. If the unit was in OnLine mode (low power standby mode), then power was removed, you will not be
able to connect using the GUI until the unit is repowered and a GPS lock is achieved (GPS LED is off)
and SatComm has entered low-power standby mode again.
Q. Why are Manufacturing Test and Certification mode not available for customers?
A. These modes are areas of the SatComm firmware that are only used by Stevens internal personel to do calibration
and specific testing of the system that are unrelated to the customer’s use of the product. If the customer had access
to the functions contained in this part of SatComm firmware, then there is potential to change the calibration and
cause the unit to be out of spec and if used this way, could be flagged by the our certifying agency, NOAA.
Q.What is the difference between “Low Power Standby Mode”, “Online Mode”, and “Off-Line Mode”?
A. Low Power Standby Mode and Online Mode are the same. When the SatComm unit is Online, it is in a low
power state that we call Low Power Standby Mode. All the LEDs are out and the unit is consuming the minimal
amount of power. There is a process when the unit is put Online by either selecting 3 from the Off-Line Menu or
pressing the “Switch to Online Mode” button in the GUI. Both the GUI and the terminal program will show the
following message before getting to the Online state:
SATCOMM acquiring GPS time and date
Enter “B” to go back to Off Line
SATCOMM Autocalibrating…..Please Wait
SATCOMM On Line Status: Confirmed
At this point SatComm is in Low Power Standby Mode, AKA On Line. Power will automatically come back on for
either a Timed or Random transmission, and LEDs will light up. As soon as the unit is finished with the
transmission, it will resume On Line mode (LEDs off).
Off Line mode is when the SatComm is not in any scheduling mode. It is powered and waiting for instructions of
commands. LEDs are lit. Off Line mode is used for doing setup and diagnostics. When the unit is prepared, it can
then be put into On Line mode to begin (or resume) Standard and Random transmissions.
Q. How do I get the SatComm unit Off-Line once it is Online?
A. There are a couple of methods that can be used to go Off Line:
1. If the terminal program is used (such as Hyperterm) to go On Line, connect to SatComm with the
terminal again and hit any key. The following message will be displayed:
ON LINE
1 = Display System Status
2 = Go Off Line
3 = Clear Fail Safe Flag
4 = Go Back To Low Power Standby
Select 2 to go Off Line
2. If the terminal program was used (such as Hyperterm) to go On Line, open up the GUI program
SatCommSet and press the “Connect” button.
3. If the GUI program SatCommSet was used to go On Line, open up the GUI program SatCommSet
again and press the “Connect” button.
NOTE: if the GUI is used to go On Line, only the GUI can bring it back Off Line if the SatComm
remains powered. You can get back Off Line with the terminal program if you repower the unit and
follow the terminal prompts:
SATCOMM acquiring GPS time and date.
Enter 'B' to go back to Off Line.
b
SATCOMM On Line Status: Interrupted
SATCOMM On Line Status: User Requested Off Line
Stevens SATCOMM Model No. 93876 Version No. 2.1
Off Line Menu
1 = Display System Status
2 = Setup the System
3 = Go to On Line Mode
4 = Go to On Air Test Mode
5 = Go to Manufacturing Test Mode
6 = Go to Certification Mode
7 = Go to DCPC Mode
X = Initiate System Reset
IMPORTANT: If the SatComm is in the middle of a transmission cycle, DO NOT attempt to go Off Line
until the transmission cycle is finished and the unit enters Low Power Standby mode again (LEDs off).
Q. How is the External Data Logger connector setup?
A. The external logger connector is setup as a DTE (data terminal equipment) and it uses a DB9-male connector.
This was done in order to use a typical 9-pin, male - female RS232 cable to connect between the Stevens SatComm
and the Stevens DL3000 data logger, which is a DCE (data communication equipment). If a different data logger is
used that has a different DB9 cable or is a DTE connection, then an appropriate adapter will be necessary.
Q. If I’m setting up multiple units using the GUI, how do I disconnect from one SatComm and connect to the
next one? I don’t see a “disconnect” button.
A. The current version of the GUI (SatCommSet 2.0) does not have a “disconnect” button. Once the new settings
for the SatComm are uploaded, simply click the “X” in the upper right corner to close the setup window. After this
click the “X” in the connection window of SatCommSet 2.0 to disconnect. A message window will appear stating,
“Exit program without putting SatComm to online mode?”. Click “Yes” to exit SatCommSet 2.0. After this
disconnect the USB cable (or DB9 cable if using the touch screen port for setup) and move on to the next unit.
Reopen SatCommSet 2.0 and connect to this next unit.
Note: If you setup the SatComm and then go online (waiting for GPS lock and RTC calibration), you can
simply, close the GUI, unplug the USB cable and unpower the unit. The guidance above is for the case where
you are not going online yet.
Q. What is the DCP Command Receiver port used for?
A. The idea behind the DCP Command Receiver port originated from NOAAs desire for two-way communications
to the GOES transmitter. This is documented in the GOES V2.0 spec, but it is not implemented. Stevens decided to
include this port in case the spec become reality sometime in the future. In the mean time, we have firmware that
allows the data from any data logger to be echoed through this port. Sometimes customers want to have dual
telemetry. This is possible using this feature. Just click the checkbox in the GUI under the DCP Setup tab to enable
it. You can also use the terminal program in the External Logger Interface Setup, step 5, to enable this feature.
Q. What other functions does the FailSafe Reset switch have?
A. Besides clearing a FailSafe event (flag), the failsafe button can also be used to check to see if the system is
“alive” while it is in Online mode. When the SatComm is in Low Power Standby Mode, press the failsafe button.
The green LEDs for PWR and GPS will light for about 15 seconds then go out again as the unit enters Low Power
Standby Mode again.
Q. What is the difference between the USB port and the External Touch Screen port?
A. There is no difference in the function of the USB port and the Touch Screen port. They both are used for setup
and diagnostics for the SatComm. It is important to note, however that the USB port has priority if both are
connected.
Q. What happens if I set the baud rate of the USB port and the External Touch Screen port differently?
A. You will need to make sure that when you are setting up the SatComm with the different ports, that the baud rate
(and any other comm. port setting) is setup up to match the port you are using.
Q. Why can’t I change the USB port and Touch Screen port settings in the GUI? They appear “grayed out”
A. The default settings of the SatComm unit baud rate, data bits, parity, and stop bits is 38.4K baud, 8 data bits, no
parity and 1 stop bit. Because these ports are just used for setup, it did not make sense to make them changeable.
However, if you absolutely have to make a change, it is possible to do so with the terminal program. The “grayed
out” setting will show this change in the GUI, but you will need to use the terminal program to change them back if
needed.
Q. What baud rate is used to echo the data to the DCP Command port? I see no settings for this in either the
GUI or the terminal program.
A. Correct. There is no setup necessary for this port other than enabling it for echoing the data. The default settings
are 38.4k baud, 8 bit, no parity, and 1 stop bit.
Q. What happens to my transmissions if the battery voltage falls below 10.5VDC or goes above 16VDC?
A. If the battery voltage falls outside the range of 10.5 – 16.0VDC, the SatComm will inhibit the transmission until
the voltage is within the specified range again.
Q. What does VSWR mean and how can I ensure that it is a good measurement (low number)?
A. VSWR stands for Voltage Standing Wave Ratio, and it is a measure of the ratio of signal power supplied to the
load (antenna) vs how much signal power gets reflected back due to inefficiencies in the load impedence. To ensure
that you have a good VSWR, which is a low number, make sure the RF output cable and antenna are connected
properly. If the connectors on either the cable or antenna is miss-threaded, or damaged, or the cable or antenna is
damaged, then the VSWR measurement number will be high (I.E. > 005.00). If the number measured is too high,
then the SatComm will inhibit the transmissions in order to avoid damage to the unit.
Q. How do hook up the chassis ground?
A. Simply unscrew the terminal wing nut on the back panel (same side as the RF Output) and attach a heavy gage
wire with either a spade of ring lug connectors at each end. Attach one side to the SatComm and tighten the wing
nut down on it. Attach the other end to chassis ground of the DCP.
Q. Why is lightning protection important and how can I implement lightning protection for my SatComm
unit?
A. Sometimes the DCP systems are installed in parts of the world that have high humidity and many lighting events.
In this case it is advisable to use a lightning suppressor device on the RF output between the SatComm and the
antenna. Stevens can supply this device and it is listed on the accessories list of the SatComm data sheet, Stevens
P/N 92767-02. Also, ensure that chassis ground is installed. This will help protect the SatComm as well.
Q. What happens if I accidentally connect my battery cables backward?
A. The SatComm is equipped with reverse battery protection, so if the unit is accidentally connected incorrectly
there will be no current draw and no power to the unit.
Q. How much environmental protection does my SatComm unit have?
A. While the SatComm is designed for a wide temperature range environment, it is not environmentally sealed. It is
important to keep the SatComm unit inside an environmentally sealed enclosure such as a NEMA-4 enclosure.
Q. How do I ensure good GPS function?
A. To ensure the best GPS function, install the Mag-Mount GPS antenna on as large a metal surface (ground plane)
as possible with the top side of the antenna pointed toward an open view of the sky. Try to avoid any obstructions
that would get in the way of the GPS signal coming from the Satellites, such as metal objects, trees, buildings,
rooftops, etc. It is possible to receive GPS signals inside an enclosure or building, but the GPS signals will be
greatly attenuated and getting a GPS lock will take longer.
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