Serial Port J51 - Pacific Scientific OC950 Installation & Hardware Reference Manual

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