LA010812A © 2007 Navman Wireless. All rights reserved. Proprietary information and specifications subject to change without notice.
4.2 Antenna gain
Feature
Jupiter 21
Jupiter 31
antenna.gain
active.antenna.gain.
should be in the range
of 20 to 30 dB
best results achieved
with an active antenna
gain of 16 dB at the
module input
.
Table 4-3: Antenna gain comparison
4.3 Pinout functions
All pin functions are the same with the exception of DGPS on Pin 15 and the Pin 20 functional
difference:
Pin
Jupiter 21 name
Jupiter 31 name
Performance issues
15
RXB
RXB
J21: second serial data input port. J21/J21D only
receives DGPS messages in RTCM (J21S does
not support DGPS)
J31: does not support DGPS messages
20
GPSFIX
(active low)
WAKEUP
J21: outputs low when the receiver has a fix, high
otherwise
J31: Push-to-fix wakeup on positive going edge.
Table 4-4: Pinout function comparison
.
4.4 J31 Pin assignments
J1
Name
Type
Description
1
VANT
P
external power supply for active antenna
2
PWRIN
P
primary VDC power input
3
VBATT
P
backup battery input
4
PWRIN
P
primary VDC power input
5
RESET
I
master reset (active low)
6
GPIO 14
I/O
reserved - no connect
7
GPIO 15
I/O
reserved - no connect
8
BOOT
I
serial boot (active low; can be held high or open circuit for
normal.operation)
9
GPIO 1
I/O
reserved - no connect
10
GND
P
ground
11
TXA
O
CMOS level asynchronous output for UART A
12
RXA
I
CMOS level asynchronous input for UART A
13
GND
P
ground
14
TXB
O
CMOS level asynchronous output for UART B
15
RXB
I
CMOS level asynchronous input for UART B
16
GND
P
ground
17.
GND
P
ground
18
GND
P
ground
19
PPS
O
pulse per second output 1uS wide
20
WAKE-UP
I
PTF wake-up, active on positive-going edge
Table 4-5: J1 connector pin functions
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