Nidec Control Techniques Digitax-SF DA28C23 - Connection to RS-485 Circuit

50
4. Connections
Digitax SF Instruction Manual
5. Descriptions of CN1 Connector Signals
RS
Connection to RS-485 circuit
Control Mode
P S T
RS-485 communications with the host controller
When connecting multiple drives, be sure to install a termination resistor of approximately
200 Ω between signal lines of the end drive.
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 drive less than 3m.
Between drives, make it less than 1m.
Signal ground of communication IC of the drive is connected to signal ground inside the
drive. 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
5V
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SG
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FG
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HostController
Shield
Twisted-paircable
Drive
dif.
24
5
i/o
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