Rockwell ZODIAC Setup guide

Development Kit Setup and Operation
Guide For The “Jupiter” GPS Receiver
Order No. GPS-29
Revision 2
June 1996

Information furnished by Rockwell International Corporation is believed to
be accurate and reliable. However, no responsibility is assumed by Rockwell
for its use, nor any infringement of patents or other rights of third parties
which may result from its use. No license is granted by implication or other-
wise under any patent rights of Rockwell other than for circuitry embodied
in Rockwell products. Rockwell reserves the right to change circuitry at any
time without notice. This document is subject to change without notice.
Zodiac is a trademark of Rockwell International Corporation.
IBM PC is a registered trademark of International Business Machines, Inc.
Notice

Section 1
Introduction ......................................................................1
Section 2
Equipment Supplied.........................................................3
Equipment Needed...........................................................3
Section 3
Description........................................................................5
Section 4
Configuring The Development Kit ..................................9
Appendix A
Acronym and Abbreviation List .....................................19
Development Kit Setup and Operation
i
Table of
Contents

Development Kit Setup and Operation
This page intentionally left blank
ii

The Rockwell ZodiacTM Development Kit is designed to
facilitate evaluation of Rockwell’s “Jupiter” Global
Positioning System (GPS) receiver engine based on the
Zodiac chip set. The receiver can be used in both static
and mobile operations for evaluation purposes.
The Development Kit implements the receiver control
operation and input/output (I/O) functions of the GPS
receiver using an IBM-AT compatible personal computer
(PC), a serial port, external antenna, and power supply.
The GPS receiver is contained in a housing with I/O
connectors, status LEDs, and configuration DIP switches
as shown in Figure 1.
This document explains how to configure the
Development Kit and the receiver, and how to set up
the test equipment.
1
Introduction 1
Development Kit Setup and Operation
Figure 1. Front (top) and Rear (below) Panels of the Development Kit.
ZODIAC 
Development Kit
POWER POWER DGPS
ACTIVE NMEA ASSURED
TIME 
MARK

ANTENNA
SERIAL PORT 1 SERIAL PORT 2 1 8
DC POWER
9-16 VOLTS
+
–
CLOCK
OUT
12345678
ANTENNA
SERIAL PORT 1 SERIAL PORT 2 1 8
DC POWER
9-16 VOLTS
+
–
CLOCK
OUT
12345678

2
LABMON, the GPS monitor and controller software, is
provided with the Development Kit to communicate
with the receiver. This software runs on the PC and
allows the user to control the receiver and to display the
receiver output message data. Externally supplied Radio
Technical Commission for Maritime Services (RTCM SC-
104) data can also be logged using a second PC serial
port if desired. The LABMON software source code is
included to provide a reference for similar Original
Equipment Manufacturer (OEM) code implementations.
Details on how to use LABMON are found in a compan-
ion document, LABMON Operation Guide For The
“Jupiter” GPS Receiver. Further information about GPS
and the Zodiac family of GPS receivers is provided in
the Zodiac GPS Receiver Family Designer’s Guide.
1
Development Kit Setup and Operation

Development Kit Setup and Operation
3
The Development Kit contains the following items as
depicted in Figure 2:
1. “Jupiter” receiver, power supply, voltage regulators, and
RS-232 drivers in housing.
2. Active patch antenna with male SMA connector.
3. Two RS-232 cables with female DB-9 connectors at both
ends.
4. 120V AC, 60 Hz/12 VDC power adapter.
5. 12 VDC automotive power adapter.
6. Zodiac GPS Receiver Family Designer’s Guide.
7. LABMON Operation Guide for the “Jupiter” GPS Receiver.
8. Development Kit Setup and Operation Guide For The
“Jupiter” GPS Receiver (this document).
9. Zodiac LABMON software on a 3.5-inch diskette.
The following OEM supplied equipment is also
required, as a minimum, to test the “Jupiter” GPS receiv-
er:
1. IBM-AT compatible PC processor with at least one avail-
able serial port, a 3.5-inch diskette drive, at least 640 KB
RAM and DOS version 3.0 or greater.
A laptop or portable PC is highly recommended since it
allows the receiver to be easily evaluated in an outdoor
environment where GPS signals are more accessible.
2. Color monitor with VGA or EGA, or monochrome monitor
with VGA (no monochrome with EGA).
3. RTCM data source (required only if the differential capability
is being tested).
4. Cabling to connect the RTCM data source to the second
PC serial port and the receiver’s Auxiliary port for simulta-
neous RTCM SC-104 data collection and DGPS operation.
A ribbon cable with three connectors is recommended.
2
Equipment
Supplied
Equipment
Needed

2
Development Kit Setup and Operation
4
Zodiac GPS Receiver Family
Designer's Guide LABMON Operation Guide
LABMON
Software
(1)
(3)
(2)
(6) (7)
Development Kit Setup and
Operation Guide
(8)
(9)
(5)
(4)
ANTENNA
SERIAL PORT 1 SERIAL PORT 2 1 8
DC POWER
9-16 VOLTS
+
–
AUXILARY
I/O
12345678
Figure 2. Development Kit Components

Development Kit Setup and Operation
5
The Development Kit features dual RS-232 level serial
data I/O ports, selectable bias voltages for active GPS
antennas, port configurations, message protocols, and
flexible internal “Keep-Alive” back-up power modes for
both the Static Random-Access Memory (SRAM) and the
low power time source.
The kit also includes the necessary circuitry to convert
the receiver’s Complimentary Metal Oxide
Semiconductor (CMOS) level output to RS-232 level,
serial data I/O. The two serial data ports are RS-232, 9-
pin D-Subminiature connectors. The first, or “host” seri-
al port, is used to send and receive both binary and
National Marine Electronics Association (NMEA-0183)
initialization and configuration data messages. The sec-
ond, or “auxiliary,” I/O port is dedicated to the recep-
tion of RTCM SC-104 Differential GPS (DGPS) correction
messages. No data is output from the receiver through
the auxiliary port.
An auxiliary output connector on the Development Kit
allows the OEM processor to access the 1 pulse-per-
second (1 PPS) time mark and 10 KHz time mark
signals. The signals available at the auxiliary test
connector are buffered CMOS level outputs driven by a
74LS04 CMOS inverting buffer device.
A number of test pins on the Development Kit board
provide access to I/O signal lines. These test pins are
located before the RS-232 drivers and timing reference
signal buffers to allow examination of these signals at
CMOS levels.
Description
3

Development Kit Setup and Operation
6
The kit also includes the necessary circuitry to regulate
the DC power input and to provide the necessary
supply voltages to the receiver.
The Development Kit board contains jumper blocks
which allow the OEM to insert a current measuring
device inline with the primary and Real-Time Clock
(RTC) power lines to the receiver to monitor power
usage under various conditions. To isolate the receiver
from the Development Kit, an electronic bus switch is
used. This switch is controlled externally by a DIP
switch on the kit. The bus switch also provides control
over the bus voltage level. A jumper block is provided
to select the interface voltage level to be used.
DC power for the Development Kit is provided by either
an AC/DC converter or automobile adapter. The AC/DC
converter operates from a nominal 120 VAC @ 60 Hz
input and provides a 12 VDC @ 500 mA out. For mobile
operation, an automotive adapter intended for use in
12V vehicles is provided. Four front panel LEDs provide
the Development Kit’s basic status indicators. A
momentary pushbutton switch is provided on the
Development Kit board to generate a master reset signal
to the receiver.
Ribbon cables are provided to interface between the
Development Kit and the customer’s PC, and between
the Development Kit and a DGPS receiver. These cables
are terminated at both ends with female connectors to
match the male connectors on the Development Kit and
the PC.
A magnetic mount, active antenna is supplied with the
kit. An 8-foot long RF cable (RG-316) is provided for the
antenna with the proper connector already terminated.
The nominal measured attenuation of the cable with
3

Development Kit Setup and Operation
7
connector is approximately 3 dB. The supplied active
antenna should be biased at +5 VDC, but a different
active antenna with a bias of either +5 or +12 VDC may
be used. Switches located on the back panel of the
Development Kit are used to select the proper bias.
▲CAUTION: Make certain the antenna power switches
are properly set before connecting the antenna. An
antenna designed for +5 VDC operation will be dam-
aged if connected to a +12 VDC source.
A pushbutton ON/OFF power switch is provided to
control primary power to the “Jupiter” board. A push-
button reset switch is also provided on the
Development Kit circuit board to generate a receiver
system hardware reset. This reset switch is not accessi-
ble unless the cover is removed from the Development
Kit.
The “Jupiter” receiver engine contains an onboard Super
Capacitor (Supercap) which provides backup power to
the SRAM and RTC devices for at least an hour after
power has been removed from the board. This feature
provides the receiver with a “hot start” capability by
maintaining last position, current time, and satellite
ephemeris data in SRAM.
There is also a provision to supply an external backup
voltage to the RTC by properly configuring a jumper
block and a configuration DIP switch. When the jumper
block and DIP switch settings are made, the current
time is maintained whenever the Supercap has been
discharged. This feature provides the “Jupiter” with a
“warm start” capability by maintaining clock time when
the set has been powered down for longer than an hour
and the contents in SRAM are no longer valid. This
3

Development Kit Setup and Operation
8
3
external backup power is maintained to the RTC unless
it is disabled using the DIP switches, by removing the
appropriate jumper on the kit, or by removing +12 VDC
power to the kit.

Development Kit Setup and Operation
9
▲CAUTION: If the Development Kit cover is removed
during configuration, proper Electrostatic Discharge
(ESD) precautions should be observed when handling
the unit to prevent possible damage to circuits.
Failure to observe these precautions may result in
permanent damage to the unit.
The Development Kit should be correctly configured
before it is connected to the PC and powered up.
The “Jupiter” board is configured using a bank of eight
dip switches, three jumper blocks, and a single, two-
position jumper switch block. The relative position of
each configuration device on the “Jupiter” board, as
well as the auxiliary I/O connector, is shown in Figure
3.
The primary configuration switches, located on the rear
of the Development Kit, are illustrated in Figure 4. They
are shown in their normal default positions.
▲CAUTION: The antenna bias may be set to either 0,
+5, or +12 VDC for an active antenna. The switches
must be set correctly to avoid possible damage to the
unit. The active antenna supplied with the
Development Kit must be set to +5 VDC only. If a pas-
sive antenna is used, be sure to set the antenna bias
to 0 volts VDC. Remember to set the Development Kit’s
power switch to OFF or remove power from the unit
before changing these switches.
Switch 1 is reserved and should be set to the OFF posi-
tion.
Switch 2 is used to select the receiver’s output message
protocol. If switch 2 is set to the ON position, the
receiver’s output message format will be set to NMEA-
4
Configuring
The
Development
Kit

4
Development Kit Setup and Operation
10
JB7
JB6
JB1
JB2
JB3
JB4
JB5
JB8
JB9
J3 1
2
3
4
+5V Jumper
+3V Jumper
Auxiliary I/O Connector
Configuration Switches
Master Reset Switch
RTC Backup Voltage
Jumper
Interface Signal
Voltage Jumper
Figure 3. “Jupiter” Board with Location of Configuration Devices
Switch/Function: ON: OFF:
1 Reserved N/A N/A
2  Host Port Protocol NMEA Assured Rockwell Binary
 or NMEA depending
 on Switch 3
3  EEPROM Enable/Disable EEPROM Disable EEPROM Enabled
4  Reserved N/A N/A
5 I/O Control Enable I/O signals Disable I/O signals
6 RTC Control RTC Backup RTC Backup
 Power Enabled Power Removed
7  Preamp Voltage Select Apply +5 VDC Apply +12 VDC
 to Active Antenna to Active Antenna
8  Preamp Power Enable Preamp Power On Preamp Power
 for Active Antenna Off For Passive
 Antenna
1 2 3 4 5 6 7 8 ON
OFF 
Figure 4. Development Kit Configuration Switches

Development Kit Setup and Operation
11
0183 with Host port settings of 4800 bps, no parity, 8
data bits, and 1 stop bit. If switch 2 is set to the OFF
position, the receiver’s output message format and com-
munication parameters are determined by the configura-
tion of switch 3 as follows:
•If switch 3 is ON when switch 2 is OFF, ROM
defaults are used and the receiver will output
Rockwell binary format messages with Host port
settings of 9600 bps, no parity, 8 data bits, and 1
stop bit.
•If switch 3 is OFF when switch 2 is off, the
receiver’s output protocol,communication param-
eters, and initialization parameters will be deter-
mined from data stored in SRAM or EEPROM
(whichever is valid). That is, the receiver recalls
the settings from its last operating session.
Switch 3 is used to enable or disable the Electrically
Eraseable Programmable Read-Only Memory (EEPROM).
When switch 3 is ON, EEPROM is disabled and ROM
defaults such as message format, host port communica-
tion settings, and receiver default message set are used.
When switch 3 is off, user-configurable settings stored
in EEPROM are used. This switch should normally be
OFF to use data such as clock parameters, last position,
and receiver configuration from EEPROM.
NOTE: Be advised that if the Development Kit is operated
with switch 3 in the ON position (EEPROM disabled),
then each power cycle or reset of the receiver may result
in a longer Time-To-First-Fix (TTFF). This is because the
receiver will use the default initialization parameters
stored in ROM rather than more current initialization
parameters that may be available in SRAM or EEPROM.
4

Development Kit Setup and Operation
12
4
Switch 3 must be in the Off position for the receiver to
output the results of a commanded Built-In Test (BIT).
Switch 4 is reserved and should be set to the OFF posi-
tion.
Switch 5 is used to control the I/O signals to the receiv-
er. Set switch 5 ON to enable and OFF to completely
disable the receiver’s I/O signals.
Switch 6 is used to control whether the Development
Kit will supply RTC backup power when the receiver
has been switched off. Set switch 6 ON to supply RTC
backup power and OFF to remove RTC backup power.
When switch 6 is ON, RTC back-up power is supplied
to the receiver as long as the Development Kit is receiv-
ing +12 VDC power from the supplied AC/DC adapter
or car adapter.
The “Jupiter” board’s Supercap will continue to supply
backup power to the RTC until it is sufficiently dis-
charged regardless of the switch 6 setting.
Switch 7 is used to select the voltage applied to an
active antenna when switch 8 is in the ON position. Set
switch 7 to ON to apply +5 VDC and to OFF to apply
+12 VDC (only +5 VDC should be applied when the
active antenna supplied with the Development Kit is
used).
Switch 8 is used to select between an active and a pas-
sive antenna. Set switch 8 to OFF for a passive antenna
and to ON for an active antenna. The ON setting allows
DC voltage (selected by switch 7) to be applied to the
center conductor of the RF cable.

Development Kit Setup and Operation
13
A jumper block on the Development Kit, with pins
labeled JB5 and JB6, may be used to disable the backup
power to the RTC from the kit. Remove the jumper to
disable the backup power; leave the jumper in place to
supply voltage to the RTC even when primary power has
been removed from the receiver.
To supply the RTC backup voltage from an external
source, remove the jumper and connect the voltage
source to pin JB6. Consult the Zodiac GPS Receiver
Family Designer’s Guide for more information on the
power requirements.
Two additional jumper blocks are provided to enable
+3.3 VDC or +5 VDC primary power. To enable the +5
VDC primary power to the receiver interface connector,
the jumper should be in place over the pins labeled JB1
and JB2 on the circuit board.
To supply the primary voltage from an external source,
remove the jumper from pins JB1 and JB2 and connect
the voltage source to pin JB2. Consult the Zodiac GPS
Receiver Family Designer’s Guide for more information
on the power requirements.
A switch jumper block is provided to select either +3.3
VDC or +5 VDC for the receiver’s I/O interface. The
three-pin jumper block is labeled JB7, JB8, and JB9 on
the circuit board. When the +5 VDC “Jupiter” board is
operated with the Development Kit, the jumper should
be over pins labeled JB7 and JB8.
4

Development Kit Setup and Operation
14
There is a 4-pin AUX I/O connector on the Development
Kit as shown in Figure 5. This connector is a Molex 70553
series right-angle pin header. The connector provides
access to the buffered 10 KHz UTC signal and the one
pulse-per-second timing signal. These may be used by
the OEM’s processor for synchronization.
The pin assignments are as follows:
1. K10. Buffered 10 KHz UTC output frequency reference signal.
This is a synchronous 10 KHz output clock with a 50 ±5 percent
duty cycle.
2. TM (inverted version of TM_F Pulse). This is a 1 pulse-per-second
(1 PPS) CMOS output signal buffered through a 74LS04 device.
3. No connect.
4. GROUND.
For further information on the characteristics of these
signals, consult the Zodiac GPS Receiver Family
Designer’s Guide.
4
Figure 5. Auxiliary I/O Connector
J3 1
2
3
10 KHz Signal
Time Mark
No Connect
Ground
4

Development Kit Setup and Operation
15
4
▲CAUTION: Do not connect an antenna and apply
power to the Development Kit before reviewing this
entire section and checking the antenna bias switch
settings. The settings must be correct before power is
applied to the receiver.
When connected, a passive antenna provides a low
resistance path. Therefore, an abnormally high cur-
rent will occur in the supply circuits of the “Jupiter”
board if the switches are set for an active type.
Although the preamp power supply internal to the
Development Kit is current-limited to 65 milliamps,
this feature will only prevent damage to the receiver,
itself, but not necessarily to the Development Kit or
antenna.
Failure to observe these precautions may result
in permanent damage to the unit and/or the
antenna.
Since GPS is a line of sight system, the antenna can only
receive signals from visible satellites. Therefore, a loca-
tion for the test equipment should be selected so that
the GPS antenna is placed where the view of the sky is
least obstructed for optimal reception of the satellite sig-
nals.
Note: GPS signals are severely attenuated or totally
obscured by the roofs or walls of wood, metal, brick, or
stucco buildings. The signals are also attenuated by
coated glass found in many office structures. The
Development Kit should be taken outside or to the roof of
a building to effectively evaluate receiver performance.
With stationary evaluations, care should also be taken to
keep the antenna away from the side of a building since

Development Kit Setup and Operation
16
4
GPS signals can reflect off of metal or coated glass. These
reflections have a longer path than direct signals and
can cause multi-path errors.
The Development Kit, PC, and the RTCM SC-104 differ-
ential correction source are connected as shown in
Figure 6. If RTCM SC-104 data needs to be logged at the
same time it is sent to the receiver, the OEM must sup-
ply a cable with three connectors to connect the RTCM
correction source to the Development Kit’s Auxiliary
port and to an unused serial port on the PC. In this
case, data is only logged when LABMON is invoked
with filenames as command line arguments as described
in the companion document, LABMON Operation Guide
For The “Jupiter” GPS Receiver.
Development Unit
Or
Or
Optional Antenna
and / or Preamplifier
Optional
RTCM SC-104
Correction Source
Optional Connection for Logging RTCM Data
Antenna Power
COM2
COM1
PCMonitor
ANTENNA
SERIAL PORT 1 SERIAL PORT 2
1 8
DC POWER
9-16 VOLTS
+
–
AUXILARY
I/O
12345678
Figure 6. Development Kit Test Equipment Setup