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3 Installation
ANTENNAPOWER = ON
ANTENNAPOWER = OFF
•
The P301 jumper plug must be jumpered to the external position (pins 2 and 3) before external
LNA power is connected to pin 4B of the 64-pin wire harness connector to prevent power from
feeding back into the receiver.
•
Should it be necessary, due to extended length antenna cable, to supply external power to the
GPS/GLONASS antenna or to use an optional in-line LNA amplifier, be careful not to exceed
the voltage ratings of either the antenna or LNA.
•
No guarantee is made that the MiLLennium-GLONASS GPSCard will meet its performance
specifications if a non-NovAtel antenna is used.
It is recommended that appropriate fuses or current limiting be incorporated as a safety precaution on all power
lines used. Use a sufficient gauge of wire, for example AWG 24, to ensure that the voltage at the 64-pin connector
is within the MiLLennium-GLONASS GPSCard's requirements.
3.4.4 RS232C COMMUNICATIONS
The MiLLennium-GLONASS GPSCard is capable of communications in EIA RS232C serial data format via two
ports, COM1 and COM2. See Figure 3.2, Page 20 for data connections:
•
COM1 = pins 7 - 11, A & B
•
COM2 = pins 15 - 19, A & B
Each port has a ground connection, and supports the following signals:
•
Data Terminal Ready (DTR)
•
Clear To Send (CTS)
•
Transmitted Data (TXD)
•
Request To Send (RTS)
•
Received Data (RXD)
•
Data Set Ready (DSR)
•
Data Carrier Detect (DCD)
The port settings (bit rate, parity, etc.) are software-configurable. These are further described in Chapter 4,
Operation, Page 24.
See Table B.2, Page 53, for further information on data communications characteristics.
3.4.5 STROBE SIGNALS
The MiLLennium-GLONASS GPSCard has 5 TTL-compatible I/O strobe lines. See Figure 3.2, Page 20 for strobe
signal connections:
•
Variable-Frequency (VARF) Output = Pin 21B
•
One Pulse per Second (PPS) Output = Pin 22B
•
Measure Output = Pin 23B
•
Mark Input = Pin 24B
•
Status Output = Pin 25B
See Table B.1, Page 49, for further information on I/O strobe characteristics.
22
Table 3.1 Antenna LNA Power Configuration
P301: plug connects pins
1&2
internal power connected to LNA
internal power cut off from LNA
CAUTION
P301: plug connects pins
2&3
no external effect
no external effect
GPS/GLONASS Receiver User Manual Rev 1
P301: no plug
no external effect
no external effect
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