Terminating Resistors - YASKAWA GPD 515/G5 Modbus RTU Technical Manual

Terminating Resistor
Dip Switch SW1 is located on the lower right hand corner of the CM085 board. (See Figure 4-3
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 CM085 Board
For one-to-one connections of the CM085 card and a master device set SW1 to ON as shown
below.
Master Device
If multiple CM085 cards are connected to a master device, set SW1 on the last CM085 board to
ON as shown below.
Master Device
4-4 Wiring of the CM085 Board
TC1
1
2CN
2
3
4
on
SW1
TC2
RS-485
RS-485
CM085
BOARD
ON
CM085 Board
OFF
CM085 Board
OFF
CM085 Board
OFF
CM085 Board
ON
CM085 Board