BiStep2A 2 Amp Controller

Assembled BiStep2A

The BiStep2A board is a complete Unipolar/Bipolar dual stepper motor controller system. It includes the capability of driving one or two 2-amp stepper motors, each of which being either unipolar (4-pole) or bipolar (2 pole). You will want to review the calculating motor current faq in order to determine the current requirements for your motor.

The board is specified as allowing up to 2 amps per motor winding, with 5 to 43 volt motors supported, depending on the current requirements of the motor. The board can generate a lot of heat depending on the total current needed for a given set of motors; therefore a fan and heat sink assembly is included.

If you operate the unit using the GenStepper firmware's Double Current mode, then the unit can operate one motor at up to 4 amps per winding! Please review the motor connections faq for more information about double current operation.

Each motor and the logic circuits may use different power supplies; this allows you to fine tune your system to precisely meet your needs.

This board may be optionally configured to act as a serial router for our product line, through use of the SerRoute firmware option. This option replaces the stepper motor control with serial routing of up to five boards, 8 relay, and up to 4 TTL input operations. Please click here for more information about the serial routing firmware.

Similarly, this board may be optionally configured to operate in a NC (numerically controlled) process environment, through use of the NCStepper firmware option. This firmware tightly links the two motors together, providing for easy "exact straight line" and simplified arc/circle drawing. Please click here for more information about the NCStepper firmware.

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Key Benefits

The BiStep2A has the following key capabilities when using the GenStepper firmware:

	Up to two stepper motors may be independently controlled at one time.
	Each motor may be either 4-pole Unipolar or 2-pole Bipolar.

Each motor may draw up to 2 amps per winding.

A heat sink with integrated fan assembly is included with the board, to prevent overheating.

If only a single motor is connected to the board, then you can configure the board and wire the motor for double current mode. This allows you to handle a single motor with up to 4.0 amps/winding!

Limit switches may be used to automatically request motion stop of either motor in either direction.

Rates of 1 to 62,500 microsteps per second are supported.

Step rates are changed by linearly ramping the rates; the rate of change is independently programmed for each motor, and can be from 1 to 62,500 microsteps per second per second.

All motor coordinates and rates are expressed in programmable microstep units of 1/2 to 1/64 of a full step. Once the base step size is selected, changing stepping modes between half, full and micro does not change any other value other than which winding pairs may be driven at the same time.

Motor coordinates are maintained as 32 bit signed values, and thus have a range of –2,147,483,647 through +2,147,483,647.

Both GoTo and Slew actions are fully supported.

Four modes of stepping the motor are supported:

	Half steps (alternates 1 winding and two windings enabled at a time),
	Full power full steps (2 windings enabled at a time)
	Half power full steps (1 winding enabled at a time)
	Near-constant-current microsteps (each from 1/64 to 1/2 of a full step)

A TTL "busy" signal is available, which can be used to see if the motors are still moving. Note that this information is also available from the serial communications subsystem.

Simple control of the motors may be done by switch closure: i.e., each motor can be told to slew left or right, or to stop by simply grounding some input lines. Similarly, the rate of motion can be controlled via stepping through a standard set of rates via grounding another input.

Complete control of the motors, including total monitoring of current conditions, is available through the 2400 or 9600 baud serial connection.

An additional mode is available which allows an external computer to directly generate step sequences on the motor control lines. Up to 62,500 microsteps per second may be requested.

The system can be configured to operate in 1/2 power mode, wherein it reduces the power to all windings by 1/2 for all actions. This can be used to "overvoltage" a motor, in order to generate more torque.

The logic circuits and each motor run off of their own power supplies. If the motors require less than 15 volts, then you may tie them together (externally to the board), to use one supply for all.

Theoretically, an unlimited number of boards can be controlled via one serial line, if the SerRoute product is used.

Click Here for the full PDF manual for the BiStep2A with the GenStepper firmware.

Click here if you need to download the current version Adobe Acrobat Reader from Adobe's site.

We accept American Express, MasterCard, Visa and Discover for orders from the USA. For international orders, we require wire transfers.

All products come with a 30 day satisfaction guarantee, and the assembled products come with a 30 day return to factory warranty. Please click here for the details...

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Key Benefits

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