Omron CQM1H-CLK21 - Manual (Page 125)

102
Repeater Units Section 4-6
Note Set the same baud rate for all the nodes on the Network. Normal communica-
tion cannot be performed unless the same baud rate is set for all the nodes.
4-5-4 Terminating Resistance
Turn ON the terminating resistance using the switch on the bottom of the Unit
for the Units of both ends of the Network. The terminating resistance is
required at both ends of a Network to absorb unnecessary signals and reduce
noise.
The Controller Link Unit has built-in terminating resistance, which can be con-
nected simply by turning ON the slide switch.
Note 1. Always turn OFF the PLC’s power before setting the terminating resistance
switch.
2. Turn ON the switch to connect terminating resistance at the nodes at both
ends of the Network and turn OFF the switch at all other nodes. Normal
communication cannot be performed in the Network unless all the nodes
are set properly.
3. The TER indicator will light when the terminating resistance switch is set
to ON.
4. The switch is factory-set to OFF (terminating resistance not connected).
4-6 Repeater Units
Repeater Units must be set as shown in the following table before starting
communications.
Switch at the front Terminating resistance
OFF (default) Not connected.
ON connected
(The diagram shows the factory setting.)
Item Switch Page
Baud rate Baud rate switch, pin 1 103
Terminating resistance Terminating resistance switch 104