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One end of the M131/M132/M133 cable is TTL voltage level,which is connected to the power supply. Another
end is different.
The Difinition of the DB9 Interface as follows:
Power Supply Side
TTL
1
VCC
（
+5V
）
2
RXD
（
receive
）
3
TXD
（
send
）
4
NC
5
GND
（
ground
）
6
NC
7
NC
8
NC
9
NC
PC side
M131
（
RS232
）
1
NC
Notes:
The pin 4 and 7 are paralleled. Each
is pro12V power.
The pin 4 is pr12V when
the DTR is enable in process of
programming.
The pin 7 is pr12V when
the RTS is enable in process of
programming.
The DTR default is set enable in
most serial communication
controls.
2
RXD
（
receive
）
3
TXD
（
send
）
4
VCC1
5
GND
（
ground
）
6
NC
7
VCC2
8
NC
9
NC
M132
（
RS485
）
1
A
（
+
）
Notes
：
Only to connect the pin 1 and pin 2 is
able to get the RS485 communicate
normally well.
The pin 5 and pin 6 provides
5V/100Ma for external use.
2
B
（
-
）
3
NC
4
NC
5
GND
（
ground
）
6
Vout
（
+5V
）
M133
（
USB
）
1
VCC
（
+5V
）
Notes
：
The type A interface of the standard
USB can be directly connected USB
interface of the PC.
The USB driver can be installed.
2
-D
3
+D
4
GND
（
ground
）
