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Connections and settings
STEP400 can be powered with power supplies ranging from 12V DC to 72V DC, directly fed to the motor driver. It is also stepped down to 5V and 3.3V on the board for control power. If a PC or another device is connected to the USB port, only the control power will be supplied to the board. The required current depends on the type and number of motors and drive voltage.
If you are going to get a power supply, it is better to choose one that can provide at least 3A at 24V. You will be able to use for a wide variety of purposes.
The terminal has four screw types: The two on the left are negative and the two on the right are positive. The screw diameter is M3. The core wire of the cable can be directly tightened, but special terminals can be used for a more secure connection. The following are examples of compatible terminals:
- NICHIFU TMEX1.25-3N
STEP400 can be used with bipolar stepper motors with a phase current of around 5A or less. Please refer to this page for examples of usable motors.
A 3.81mm (0.150") pitch header (Euro-style terminal block) is provided on the board. Corresponding connectors include the following:
- TE Connectivity AMP connectors 284507-4
- Ningbo Kangnex Elec WJ15EDGK-3.81-4P
The connection terminals, from left to right: A1, A2, B2, B1. One coil should be connected to the A1-A2 pair and the other to the B1-B2 pair. If the pairs are swapped or the wiring is switched in the pair, the direction of motor rotation will be reversed. It is useful to have the same connection rules for the entire board.
There are two terminals for each axis to which sensors and switches can be connected: HOME and LIMIT. The roles of each terminals are the following:
Input terminal for origin detection. Since the stepper motor cannot detect its own position, a separate sensor is required to return to the home position at startup. It is directly connected to the motor driver IC and can be used to assist driver control. The input pin is pulled up at 3.3 V inside the driver IC.
These pins, which are separate from the origin pin, can be used to limit sensors in their operating range. It can be used to stop the motor by setting up a function to stop the motor, or used completely independently. The input terminal is pulled up to 3.3V.
We use XA series connectors from JST (J.S.T.MFG.CO.,LTD.) . For compatible connectors, please refer to the following:
Product name | Model number | Remarks |
---|---|---|
(Reference) Circuit Board Post | B03B-XASK-1 (LF)(SN) | Parts mounted on the board |
Housing | XAP-03V-1 | Main body of the connector to be inserted. |
Contact | BXA-001T-P0.6 | Connection to be inserted into housing. |
The pin assignments are the same for HOME and LIMIT.
Pin number | Function |
---|---|
1 | GND |
2 | SW/sensor input |
3 | 5V output |
The driver responds when the input terminal changes from High (3.3v) to Low (0V). Therefore, the mechanism and sensor (or switch) must be combined in such a way that the contacts are open (normal open) under normal conditions.
The DIP switch sets the STEP400 ID that is used to reply to OSC messages, and is also reflected in the IP address and send port number.
The ID is set in binary digits. For more information on setting the DIP switches in binary digits, click here.
Channel setting with DIP switches
Item | Initial value |
---|---|
IP address | 10.0.0.100+ID |
MAC address | 0x60, 0x95, 0xCE, 0x10, 0x02, 0x00+ID |
Destination address | 10.0.0.10 |
OSC incoming port | 50000 |
OSC outgoing port | 50100+ID |
Individual MAC addresses are assigned to STEP400, but the initial values are as shown above. Please set the MAC before use.
We are going to make a feature where you can press this switch to reset or power up to enter setup mode, but the feature hasn't been completed yet. Therefore, currently pressing this button doesn't do anything! If you need to change the network settings, you will have to rewrite the firmware directly.
We are looking into ways to get the setup done via SD card but we haven't completed this feature yet either.
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- Tutorial
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Connections and settings
- Power supply and Motor
- Sensor and Switch
- Network and DIP switch
- Setup with a microSD card
- Example parameter values for example steppers
- Function description
- OSC command reference
- Technical information