GE 90-30 PLC Series Installation And Hardware Manual page 363

B
Logic Diagram
The following figure shows the logic diagram for the RS-422/RS-485 to RS-232 Converter.
Figure B-4. RS-422/RS-485 to RS-232 Converter Logic Diagram
B-6 Series 90-30 PLC Installation and Hardware Manual – August 2002
RS-232/RS-485
CONVERTER
RS-232
(IC690ACC900)
25-PIN
1
SHIELD
2
SD
3
RD
MODEM
4
RTS
5
CTS
DCD
8
DCD
7
SG
NC
20
ATTACH
DTR
a44539
RS-485
15-PIN
1
SHIELD
9
TERMINATOR
RESISTOR
120 Ω
11
RD ( B' )
10
RD ( A' )
13
SD (B )
12
SD (A )
8
CTS ( B' )
15
CTS ( A' )
14
RTS ( B )
6
RTS ( A )
3
DCD ( B )
2
DCD ( A )
5
LOGIC
+5
POWER
7
SG
4
ATCH/
GFK-0356Q