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Document Title: 8
User’s Manual for the GPS Orion-S/-HD Receiver
Document No. Issue 1.0
GTN-MAN-0110 June 22, 2003
DLR/GSOCNo part of this document shall be reproduced in any form or disclosed to third parties without prior authorization.
3. Operations Guide
3.1 Basic Receiver Handling
3.1.1 Hardware Setup
For operating the GPS Orion receiver in a ground based test environment, the following
hardware items are typically required:
• Orion main board
• Orion interface board with power cable
• Power supply or battery (typically +12 V, 250 mA)
• Active GPS antenna (ca. 26 dB gain) with cable and SMA (or MCX) connector (male)
• PC with Windows operating system
• Serial interface cable (cross-link with female-female sub-D9 connectors)
Upon first operation, mount the main board on top of the interface board and connect both
board via the 9-pin connector. Since the standard interface board provides no PPS interface,
pin 10 of the main board (optional) will remain unused in this configuration. Next,
• connect the active antenna to the antenna plug on the main board
• connect port A (left) of the interface board to the PC’s COM1 port
• connect blue cable to ground pin of power supply (minus pole of battery)
The receiver will start to operate once the red cable is connected to the plus pole of the
power supply.
3.1.2 Precautions
To avoid an undesirable behavior or even destruction of the receiver, the following handling
instructions shall be considered:
• The center pin of the antenna connector provides a +5V power supply for the low
noise amplifier of an active GPS antenna. To avoid short cuts it is strongly advisable
to disconnect the receiver from the power supply prior to (dis-)connecting the antenna
or pre-amplifier.
• R/F attenuators between the receiver and the pre-amplifier must be equipped with a
DC by-pass to avoid heating of the attenuator or an overload of the receiver’s DC
power feed.
• Always connect the plus pin of the power supply last and disconnect it first. Otherwise
spurious ground connections via the serial cable or the antenna line may keep the re-
ceiver unintentionally powered up.
3.1.3 Serial Communication
The Orion-S and -HD receivers use port A (left connector) as the prime port for command
input and message output. By default, this port employs the following RS232 communication
parameters:
• 19200 baud
• no parity
• 8 data bits
• 1 stop bit
• no handshaking