Slave
Station
Last
Station
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.
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
Power Source for Converter.
Must be wired no less than 3
meters (10 feet) from the converter.
5V
0V
15- PIN
MALE
PIN
RS-485 Cables
Make connections
inside D-connectors
TO OTHER PLC's
RS-232/RS-485
Converter
IC690ACC900
15-PIN
FEMALE
RS-485
PORT
25-PIN
FEMALE
RS-232
PORT
9-Pin Female to 25-
Pin Male RS-232
Shielded Cable
3
RD
2
TD
5
CTS
20
DTR
8
DCD
7
GND
1
SHLD
RD 2
TD 3
RTS 7
CTS 8
DCD 1
DTR 4
GND 5
PIN
PIN
9 Pin Male
Connector
Computer
RS-232 Port
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
CPU
RS-485 Port
15 Pin Female
Connector
*
(NC)
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.
66
GFK-1503E
VersaMax PLC User Manual
For public disclosure
Summary of Contents for VersaMax PLC
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