20
4
Installation and Connections
4.3 Connections
Connection Example 1 If Using a PC as the Higher-level Host to Control the Unit
*1
Set the terminating resistor settings of all units to be connected to the repeater hub to “ON”.
Factory default settings for the connector type are set to "ON".
*2
If connecting to a PC, it is necessary to use a serial converter to convert the serial
communication of the RS-485 to make the connection.
*3
The above shows an example when connecting a EPU-210-B. When connecting a EPU-
220-B to the repeater hub, please refer to the
EPU-220 instruction manual.
・
Install a terminating resistor (120 Ω) between communication line terminals "D+" and "D-"
on the serial converter side.
・
Be sure to use the cables for a repeater hub with a maximum extension of less than 30 m (98 ft).
D+
D－
DG
D+
D－
DG
D+
D－
DG
D+
D－
DG
D+
D－
DG
24V
0V
24V
0V
D+
D－
DG
24V
0V
EPU-210-B
*3
EPU-210-B
*3
Repeater hubs
EORP-200
Serial
converter
COM A
connector
COM B
connector
EPU connector 1
*3
EPU connector 2
*3
Power supply
terminal block
FG
24V
0V
EPU connector 1
*3
*2
Cables for repeater hubs
(Optional)
EOCA-200-B
Cables for repeater hubs
(Optional)
EOCA-200-A
Cables for repeater hubs
(Optional)
EOCA-200-C
Terminating resistor (120 Ω)
Power
supply
Terminating
resistor
ON
Terminating
resistor
ON
Terminating
resistor
ON
EPU-210-B
*3
Repeater hubs
EORP-200
COM A
connector
Power supply
terminal block
FG
24V
0V Power
supply
*1
*1
*1
*3
