MicroARM-A9
Programmable Logic Controller
3.3 Communication port
3.3.1 COM0 RS232
Standard broaching on DB9 (A version of the board) or see broaching on the
implantation(B version of the board).
1
2
3
4
V3.3 TX0
RX0 0V
3.3.2 COM1 RS232 TTL
See broaching on the implantation.
1
2
3
4
V3.3
TX1
RX1 0V
3.3.3 COM2 RS485
1
GND
2
GND
3
B
4
A
5
12V
See broaching on the implantation. This port has 2 connectors
with a 12 Vdc power supply. Its function is to feed 2 sensors
and to communicate with it.
6
12V
7
A
8
B
9
GND
10 GND
3.3.4 COM3 RS485
See broaching on the implantation.
1
2
3
GND 0V B
A
7
1 2 3 4
1 2 3 4
1
2
3
4
5
6
7
8
9
10
1 2 3
