GE VersaMax PLC User Manual page 66

Computer
9-Pin Female to 25-
RS-232 Port
Pin Male RS-232
Shielded Cable
9 Pin Male
Connector
PIN
RD 2
TD 3
RTS 7
CTS 8
DCD 1
(NC)
DTR 4
GND 5
66 GFK-1503E
For public disclosure
Master
When wiring RS-485 multidrop cables, reflections on the transmission line can be
reduced by daisy-chaining the cable as shown below. Make connections inside the
connector to be attached to the PLC. Avoid using terminal strips to other types of
connectors along the length of the transmission line.
RS-232/RS-485
Converter
IC690ACC900
PIN
3 RD
2 TD
5 CTS
20 DTR
8 DCD
7 GND
1 SHLD
25-PIN 15-PIN
FEMALE FEMALE
RS-232 RS-485
PORT PORT
Power Source for Converter.
Must be wired no less than 3
meters (10 feet) from the converter.
Termination resistance for the Receive Data (RD) signal must be connected only on units
at the ends of lines. This termination is made at the CPU by connecting a jumper between
pin 9 and pin 10 inside the D-shell connector. Ground Potential: Multiple units not
connected to the same power source must have common ground potential or ground
isolation for proper operation of the system.
Last
Slave
Station
Station
RS-485 Cables
Make connections
inside D-connectors
PIN
DCD(A) 2
DCD(B) 3
RD(A') 10
RD(B') 11
SD(A) 12
SD(B) 13
RT 9
CTS(A') 15
CTS(B') 8
RTS(A) 6
RTS(B) 14
+5V 5
0V 7
SHLD 1
15- PIN
MALE
5V
0V
TO OTHER PLC's
CPU
RS-485 Port
15 Pin Female
Connector
PIN
2
3
12 SD(A)
13 SD(B)
10 RD(A')
11 RD(B')
9 RT
*
6 RTS(A)
14 RTS(B)
15 CTS(A')
8 CTS(B')
5 +5V
7 0V
1 SHLD
VersaMax PLC User Manual