GE 90-30 PLC Series Installation And Hardware Manual page 383

Logic Diagram
Figure E-2. IC690ACC903 Block Diagram
GFK-0356Q Appendix E IC690ACC903 Port Isolator
15-pin male D-connector
PL1
11
SD(B)
10
SD(A)
13
RD(B')
12
RD(A')
14
CTS(B')
6
CTS(A')
8
RTS(B)
15
RTS(A)
+5Vdc
GND
Ground 1
Optical Isolation
121 ohms
Output Enable
Always on
(single port mode)
+5V
Multidrop
Switch
RTS Driven
(multidrop mode)
Output Enable
DC/DC
Converter
Ground 2
E
15-pin female D-connector
PL2
11
RD(B')
10
RD(A')
9
RT
13
SD(B)
12
SD(A)
14
RTS(B)
6
RTS(A)
8
CTS(B')
15
CTS(A')
+5Vdc
GND
E-3