Kit 24N978, For Modbus RTU Communication
3
.
Use a serial cable (customer supplied) to make
an RS-232/RS-485 connection to the PLC,
according to the following table.
FO
FO
FO
Converter
Converter
Converter
Terminal
Terminal
Terminal
RS
RS
RS---232
232
232
RS
RS
RS---485
485
485
(2–wire)
(2–wire)
(2–wire)
A
Ground
Ground
B
not used
Data B (+)
C
Rx (IN)
Data A (-)
D
not used
not used
E
Tx (OUT)
not used
Set
Set
Set Up
Up
Up the
the
the Fiber
Fiber
Fiber Optic
Optic
Optic Converter
Converter
Converter
1.
Set the DIP switches on the bottom of the
converter as shown. These settings are correct
for either RS-232 or RS-485 2–wire, with a 57.6
K baud rate.
Figure 3
2.
Set the selector switch to RS-232 or RS-422/485.
We strongly recommend RS-485 for all cables
over a few feet (a meter or two).
6
332356E
