FATEK SD3 Series - Page 142

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4. Connection
SD3 Series Instruction Manual
5. Descriptions of CN1 Connector Signals
RS
Connection to RS-485 circuit
Control Mode
P V T
RS-485 communications with the host controller
When connecting multiple ampliers, be sure to install a termination resistor of
approximately 200 Ω between signal lines of the end amplier.
Be sure to connect a pull-up resistor (RPU) and a pull-down resistor (RPD) of approximately
1.2 k Ω inside the host controller. Be sure to connect a termination resistor of approximately
220 Ω .
Make the wiring between the host controller and the amplier less than 3 m.
Between ampliers, make it less than 1 m.
Signal ground of communication IC of the amplier is connected to signal ground inside the
amplier. Connect signal ground of communications IC of the host controller to Pin No.45.
Be sure to use shielded twisted-pair cable as a noise countermeasure.
SG
5 V
RPU
RT
RPD
43
（485）
44
（/485）
SG
45
（SG）
FG
RT
HostController
Shield
Twisted-paircable
Amplifier
dif.
24
5
i/o
䐟
䐠
䐡
䐢
v
ol
t
v
ol
t
dif.
Di󱐯erential
24
24 V
open collector
5
5 V
open collector
i/o
䐟
䐠
䐡
䐢
Internal
Position
v
ol
t
Analog
Velocity
i/o
䐟
䐠
䐡
Internal
Velocity
v
ol
t
Analog
Torque