4-4 Wiring of the CM086 Board
Terminating Resistors
Dip Switch SW1 is located on the lower right hand corner of the CM086 board. (See below) When
SW1 is on, a termination resistor (100 Ohms) is connected between S/R (+) and
S/R (-).
Figure 4-3. SW1 Location on the CM086 Board
For one-to-one connections of the CM086 card and a master device set SW1 to ON as shown
below.
If multiple CM086 cards are connected to a master device, set SW1 on the last CM086 board to ON
as shown below.
Master Device
RS-485
CM085 Board
Master Device
O N
RS-485
CM085 Board
OFF
CM085 Board
OFF
CM085 Board
O N
on
S W 1
TC2
1
2
3
4
CM085
BOARD
2CN
TC1
CM085 Board
OFF
