Omron CQM1H-CLK21 - Manual (Page 127)

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Repeater Units Section 4-6
See pages 15 and 79 for details on the maximum transmission distance.
Note 1. Always turn OFF power to the Repeater Unit before setting the baud rate.
2. Set the same baud rate for all nodes on the network.
Normal communications throughout the entire network will not be per-
formed if the baud rate of even a single node differs from the others.
3. The factory default setting is 2 Mbps.
4-6-3 Terminating Resistance
Turn ON the terminating resistance at the Unit located at each end of the net-
work. The terminating resistance switch is located on the front of the Unit. The
terminating resistance is required at both ends of a network, or both ends of a
segment, to absorb unnecessary signals and reduce noise.
When a Repeater Unit is located at either end of the Network, turn ON the ter-
minating resistance switch of the Repeater Unit.
Terminating Resistance Switch for Communications Cable Terminal Block SL1 and SL2
Note The numbers 1 and 2 on the switch are in reverse order, so make sure the
switch is set correctly.
Note 1. Always turn OFF power to the Repeater Unit before setting the baud rate.
2. Turn ON the switch at the node located at each end of the network to con-
nect terminating resistance and turn OFF the switches at all other nodes
to disconnect terminating resistance. Normal communications throughout
the entire network will not be performed if the terminating resistance of
even one node differs from the others.
3. The factory default setting is OFF (terminating resistance not connected).
O N
1
2
TER SW
SL2 (See note.)
ON
TER SW
SL1 (See note.)
Switch Terminating resistance
OFF (default) Not connected
ON Connected