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earth. Trimble’s active antennas include a preamplifier that filters and amplifies the GPS
signals before delivery to the receiver.
There are two GPS antennas offered by Coleman Technologies, Inc. (1) magnetic mount
antenna and (2) bullet antenna. Equivalent antennas are available through 3
rd
party
vendors, for example Tessco at
www.tessco.com. One needs to choose an active antenna
which is either a 3v, 3.3v or 3/5v antenna.
Warning – When magnetic-mount or permanent-mount GPS antennas are installed on a
metal surface for prolonged periods, care must be taken to insulate the antennas to
prevent galvanic corrosion.
2.3 Power
The SV12 GPS Receiver is designed to be plug-and-play. The receiver requires +9 to
+32 VDC. Power can be supplied to the SV12 GPS Receiver using the DC power cable.
The power cable is terminated at one end with a 3-pin plastic connector which mates with
the power connector on the metal enclosure. The un-terminated end of the cable provides
connection to a DC power supply. Connect the red power lead to a source of DC positive
+9 to +32 VDC, and connect the black power lead to ground. This connection supplies
power to both the receiver and the antenna. The combined power consumption of the
receiver and antenna is 25mA at 12V. The yellow wire can be used for battery backup to
keep the RAM memory alive and real-time clock functioning after main power is
removed (quicker time to first fix). This circuit requires 3.0 to 12 VDC and draws 20 µA
at 3.3 VDC at 20
o
C
Note - For compliance with CE conducted emissions requirements when using the DC
power cable, the receiver must be bonded to a ground plane.
2.4 Hardware Setup
The SV12 GPS Receiver supports TSIP, TAIP and NMEA protocols. Port 2 is usually
used for TSIP or TAIP I/O and Port 1 is used to input RTCM SC-104 corrections and
output NMEA messages.
To setup the SV12 GPS Receiver do the following:
1. For TSIP or TAIP protocols, connect one end of the 9-pin serial interface cable to
Port 2 (or Port 1 to view NMEA data) of the receiver. Connect the other end of
the cable to COM1 or COM2 on a PC. A 9-pin-to-25 pin adapter may be required
for the serial interface connection to a PC, if the PC has a 25-pin communication
port.
4