Interface, 1 connector type：20 pin header，2.0 mm pitch (j2), Hw interface – RoyalTek RDR-3100 User Manual
Page 9: Rdr-3100 user manual
RDR-3100 User Manual
5. Interface
5.1 Connector Type：20 Pin Header，2.0 mm pitch (J2)
Pin
NO
Signal Name I/O Description Characteristics
1 N.C
None
connector
2 GPS 5V
I
+5V DC Power Input
DC +5V ± 1%.
3 RTC
(Backup
voltage)
I
User Supply DC +2.6 ~
+3.6V
DC +2.6 ~ +3.6V.
Current
≤ 10uA w/o battery
4 GPS 5V
I
+5V DC Power Input
5 Reset
I
Reset (Active low)
8
.
0
2.3V
V
IH
V
V
IL
>
<
6 Boot
I Boot
mode
V
V
V
V
IL
IH
855
.
0
0.3V
-
995
.
1
15
.
3
≥
≥
≤
≤
7 Back
(Reverse
line)
I
Forward or Back
Forward (Hi level :>2V)
Backward (Lo level: <0.8V)
8 N.C
None
connector
9 Odometer
I Odometer
Input frequency<32k HZ
Vih > 2V Vil<0.8V
10 GND
G Ground
Reference Ground
11 TXD1 (SiRF 3
TXD1)
O NMEA (transmit) Car PC
(UAR1)
V
V
OL
OH
715
.
0
V
V
V
375
.
2
85
.
2
38400bps, 8 data bits, no
parity, 1 stop bit
≤
≥
≥
12 RXD1 (SiRF 3
RXD1)
I
NMEA (Receive) Car PC
(UAR1)
V
V
V
V
V
IL
IH
855
.
0
0.3V
-
995
.
1
15
.
3
≤
≥
≥
≤
13 GND
G Ground
Reference Ground
14 TXD2 (SiRF 3
TXD2)
O Can bus data (transmit)
Car PC (UAR2)
Vih > VDD-0.1V Vil<0.6V
VDD:3.3V for MCU
9