SimpleMotion V2 port

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SM V2 multidrop bus with E-stop functionality
RJ45 cable compatible with Ethernet and SimpleMotion V2

SimpleMotion V2 communication link and Argon drives use RJ45 connectors and cables as physical connection standard.

RJ45 is well known from Ethernet connectors and same cables may be used with SimpleMotion wiring.

Electrical properties

SimpleMotion V2 uses RS485 electrical serial communication standard for all data transfer. Some main benefits of using RS485 are:

  • Multidrop buses possible (up to 32 devices in single serial link)
  • High reliability due to differential signaling
  • High data rates and long cable lengths possible
  • Easy to interface even from smallest microcontrollers with UART
  • Low wire count, only 2 signal wires + ground needed
  • Bidirectional data transfer (receive & transmit) in one wire pair

As default SimpleMotion V2 uses 460800 BPS bitrate and can deliver over 10 000 motion commands per second.

Use as E-stop & Enable input

E-stop and enable signal wiring to RJ45 cable
A quick'n'dirty way to make enable drive & disable safe torque off connection. May be used for testing before final wiring.
A RJ45 break-out terminal may be useful for wiring of STO and Enable signals.

In Argon drive, the same connector acts also as emergencecy stop or Safe torque off input. User may connect a e-stop button directly at the end of device chain to gain reliable stopping mechanism for all linked devices.

Connector pinout

Pin # Signal name Description Electrical wiring
1 STO2_24V STO input 2 Supply 24VDC in this pin referenced to GND to disable STO2. 1
2 Reserved Reserved for future use Do not connect
3 RS485_A RS485 signal A  RJ45 cable routes this between devices and SimpleMotion V2 USB adapter
4 STO1_24V STO input 1 24V in Supply 24VDC between STO1_24V and STO1_0V to disable STO1. STO1 inputs are floating and isolated from GND. 1, 2
5 STO1_0V STO input 1 0V in
6 RS485_B RS485 signal B RJ45 cable routes this between devices and SimpleMotion V2 USB adapter
7 ENABLE_IN_24V Drive enable control signal Supply 24VDC in this pin referenced to GND to set drive in enabled state.
8 GND Ground reference for: RS485, STO2 and ENABLE_IN RJ45 cable routes this between devices and SimpleMotion V2 USB adapter. For enable & STO connect this to external 24V power supply ground.

1) STO1 and STO2 are controlling two independent Safe torque off methods. Both must be supplied 24V simultaneously to enable torque to the motor.

2) STO1 has limited functionality on Argon if HV DC bus is shared between drives or external DC voltage is supplied. For more info, see Argon user guide/J4 connector wiring.


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