Campbell SAT HDR GOES User manual

SAT HDR GOES DEVELOPER KIT
INSTRUCTION MANUAL
4/03
COPYRIGHT (c) 2003 CAMPBELL SCIENTIFIC, INC.

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SAT HDR GOES Developer Kit
1. Introduction
The SAT HDR GOES Developer Kit includes all the parts necessary to set up
and transmit with the SAT HDR GOES transmitter. Complete testing of the
transmitter can be done with the software DCPComm.exe that is included on
the CD.
2. Included Parts
13720: SAT HDR GOES satellite transmitter
3768: Transmitter power connector
6616: SDI-12 connector
PS12LA: Power supply, rectifier/regulator, and 12-volt battery
9591: AC transformer, 120: 18-volt AC, 1.1 amp
14051: Transmitter power cable with 7-amp fuse
14271: 28 dB, 3.3 volt GPS patch antenna with 10 meter cable
12261: Right hand circular polarized 9 dBi transmission antenna with type
N female connector and mounting brackets
16986: Antenna cable for 12261, 20 feet. Type N male to type N male,
low loss RG8 coax.
10873: Serial cable, 6 ft. DB9 male to DB9 female
PC-GOES: Transmitter support software and documentation
16985: Line terminator, 25 Watt, 50 ohm load
3. Documentation
This documentation contains general information and a part lists. Other
documentation can be found on the PC-GOES support software disk. Install
DCPComm. Load DCPComm and click on help. Go to the PROGRAMMERS
GUIDE. The programmers guide is also in the file DCPCOMM HELP.CHM.
The PC-GOES software disk contains the SAT HDR GOES user manual in
PDF format. The SAT HDR GOES user manual gives some general
information regarding the transmitter, instructions for using DCPComm.exe,
and was written for users of Campbell Scientific dataloggers.
NESDIS DCS has documentation on-line. See http://noaasis.noaa.gov/DCS/
for documentation and contact information.
4. Getting Started
The SAT HDR GOES must have a valid GPS signal before transmissions can
be scheduled. The GPS signal usually will not travel though building walls or
a roof. The GPS antenna needs to be placed outside, with a clear view of the
sky. The line terminator is supplied to allow transmissions into a known good
load, without interfering with other users of the GOES data collection system.
During test and development, use the line terminator and place the GPS
antenna in a reasonable location.

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To power the transmitter, use the supplied power cable with the 7-amp fuse.
Permanent damage will result if power is connected with the wrong polarity
and the fuse is bypassed. The power cable connects between the battery cable
and the PS12 INT battery terminal. Connect the 9591 AC transformer to the
CHG and CHG ports of the PS12.
5. Initial Setup of the SAT HDR GOES Transmitter
DCPComm software is used to setup the transmitter prior to operation. There
are many settings that can also be changed via the auxiliary serial port. The
SAT HDR GOES can support two serial ports at one time. The configuration
port is always available. The other serial port must be one of the following:
auxiliary, CS I/O or SDI-12. The auxiliary serial port is an RS-232 DCE port
that is primarily used for dataloggers that do not support the CS I/O
synchronous communication protocol. The CS I/O serial port is used with
Campbell Scientific dataloggers. The SDI-12 serial port is used to read
information from SDI-12 sensors. Initially, DCPComm is used to activate the
auxiliary port. See Section 4 of the SAT HDR GOES user manual for details
regarding DCPComm software.
The DCPComm configuration file has some fields in white; these are user
settings. Other fields in gray cannot be changed without the password. If a
gray field needs to be changed, please contact Campbell Scientific. Gray fields
that may be useful to change include the power settings and the serial port baud
rate. Because changes to the power setting can violate NESDIS certification,
general users are not given access.
5.1 Communication Through the Auxiliary Serial Port
By default the auxiliary serial port is set to 9600 baud, 8 data bits, no parity and
1 stop bit. The auxiliary serial port is a DCE port with pin 2 for transmit
(output), pin 3 for receive (input), and pin 5 is ground. No other pins are used.
See the programmer guide in DCPComm help for complete details regarding
supported communication commands.
5.2 Data Format
There are two types of information sent to the transmitter via the auxiliary
serial port: the first is commands, the second is data. The data must follow
rules set by NESDIS. Prohibited control characters are DLE, NAK, SYN,
ETB, CAN, GS, RS, SOH, STX, ETX, ENQ, ACK, and EOT.
Odd parity is used for all data. Data are sent as ASCII data or binary encoded
ASCII characters (pseudo binary). The transmitted data stream includes a
preamble and the End Of Transmission (EOT) character. The SAT HDR
GOES sends the preamble and EOT; all other data formatting is the
responsibility of the datalogger.
When the SAT HDR GOES receives a prohibited character as data, the
prohibited character is replaced with an asterisk. When DAPS receives a
prohibited character, it is replaced with the “$”. DAPS uses several commands
for data retrieval. When the TYPE or DISPLAY command is used, the DEL
(0x7f) character and any bytes with a parity error are replaced with the “$”,
whereas the DOWNLOAD command does not.

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6. Hardware Issues
6.1 Power
The power supply must be able to deliver 4 amps at 12 volts DC for several
minutes. Typical current drain at 12 volts DC is about 1 mA quiescent, 200
mA during GPS acquisition, 2200 mA during transmit at 100/300 bps, and
3500 mA during transmit at 1200 bps.
6.2 GPS
The GPS receiver is a 3.3-volt system. When using an active patch antenna,
use a 3.3-volt antenna that will deliver between 12 and 18 dB of gain at the
GPS receiver. The GPS receiver can be used with a passive antenna, but GPS
performance will be compromised. Typically the GPS antenna cable has
significant losses. The supplied GPS antenna has 28 dB of gain and 1 dB of
signal loss per meter of cable. If the GPS antenna delivers too strong of a
signal to the GPS receiver, GPS performance is severely compromised, much
worse than with a weak GPS signal.
The GPS active patch antenna will perform best when mounted on a grounding
plane about six inches in diameter or larger. There should be a clear view of
the sky without conductive surfaces nearby. Reasonable steps should be taken
to avoid multi-path signal losses.
6.3 Transmission Antenna
Manufactured by Telonics
RHCP 6-ELEMENT GOES ANTENNA MODEL NO. TGA-200
Electrical Specifications
Frequency 402 MHz. (nominal)
Polarization RHCP (Right Hand Circular)
Bandwidth (1.5:1 SWR) 394-410 mhZ.
Gain 9 dBi (nominal)
Pattern Characteristics
Beamwidth (3dB) 55 deg. (typical)
1st Sidelobe -12 dB (nominal)
Axial Ratio <6 dB (2-4 dB typical)
Front-To-Back Ratio >15 dB
Impedance 50 ohms (nominal)
Power Handling Capability 100 watts
Connector Type “N” Female
Mechanical Specifications
Length 39.5” (100.3 cm)
Width 15” (38.1 cm)
Height 15” (38.1 cm)
Weight 3.9 lbs (1.77 kgs)
Mounting Bracket Weight 1.3 lbs (0.59 kgs)

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Mechanical Construction
Antenna and Hardware Lightweight Aluminum
Mounting Hardware Corrosion Resistant Stainless Steel
U-Bolt Mast Mount For 2.125’ (53.975 cm) O.D. Mast