User guide

M80 EVB User Guide
M80_EVB_User_Guide_V1.2 - 26 -
9
8
7
6
5
4
3
2
1
15
14
8
9
11
12
5
7
6
10
4
26
2
27
13
18
20
21
16
17
19
22
23
24
3
1
25
28
GND
TO PC serial port
SP3238
3V
GND
GND
T5OUT
/SHUTDOWN
V+
GND
V-
VCC
T4OUT
T2OUT
T3OUT
T1OUT
R3IN
R2IN
R1IN
/STATUS
3V
ONLINE
R1OUT
R2OUT
R3OUT
/R1OUT
GND
T5IN
T4IN
T3IN
T2IN
T1IN
C2+
C2-
C1-
C1+
MODULE
RXD
DTR
RTS
RI
CTS
TXD
DCD
Figure 24: Level match circuit
Figure 25: Pins of main UART
Table 10: Pins of Serial port
Pin
Signal
I/O
Description
Note
1
DCD
O
Data carrier detection
2
TXD
O
Transmit data
3
RXD
I
Receive data
4
DTR
I
Data terminal ready
5
GND
Ground
1
2
3
4
5
9
8
7
Quectel
Confidential