Azbil AUR450C - RS-485 3-Wire System Connection; RS-485 5-Wire System Connection

2-12
Chapter 2. MOUNTING AND WIRING
 Connection to a 3-wire system
DA
DB
SG
DA
DB
SG
DA
DB
SG
3-wire system
DA
DB
SG
FG
AUR450C
AUR450C
AUR450C
 Connection to a 5-wire system
DA
DB
SG
5-wire system
*
*
AUR450C
AUR450C
SDA
SDB
RDA
RDB
SG
FG
DA
DB
SG
DA
DB
SG
AUR450C
IMPORTANT Terminating resistor
•
Do not connect any terminating resistor to either end of the communication
path. Doing so might cause a communications failure.
•
Even if there are devices requiring a terminating resistor in the communication
path, do not connect a terminating resistor.
Handling Precautions
•
Use a twisted shielded pair cable for RS-485 communications.
•
Ground shielded wire to one point on one side of the cable.
•
When a 5-wire system is used, wire the connections marked with an asterisk (*)
externally.