MA950
3 - 13
332
Ω
332
Ω
332
Ω
10
Ω
10
Ω
1000PF
1000PF
1000PF
GND
GND
SERIAL PORT
J51
GND
GND
GND
GND GND GND GND
GND
GND GND
+12B
+5VB
USER_+5V
+5V
TO MPU
-12B
1
1
1
1
1
1
1
4
4
4
4
3
3
3
3
3
R
VCC- GND
RXD
TXD
74AC08
RS-485_ENABLE
GND
GND
SN75155
75176
75176
VCC+
VCC
VCC
T
TXD232
9 CONT
TXD485-
RXD485-
RXD232
COM_+5V
5
5
6
5
5
7
7
7
7
6
6
8
8
9
8
8
2
2
2
2
2
2
2
OC950 Serial
Communications
Transceiver
Schematic