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S100SMC Setup Information

This page contains information on connecting the power supplies and serial cable to the S100SMC, and connecting stepper motors to the terminal blocks on the S100SMC. The following diagram shows the various connections found on the S100SMC, and below this image are instructions for connecting the power supplies, DB9 cable, and any inputs or outputs to the board.

Figure 1
Power And Cable Connections

The S100SMC connects to the computer or other controlling device through a DB-9 serial cable. Only the Rx, Tx, and Gnd pins are used, in case you want to develop your own custom cable. Otherwise, any standard DB-9 male-female cable should work.

The DB-9 connector (shown in Figure 1) on the S100SMC is located beside the two power jacks. Simply push the male end of the serial cable onto the DB-9 connector and connect the other end of the cable to the communications port of your computer. The standard control software for the S100SMC allows you to select any comm port from 1 - 15.

The S100SMC operates off of two separate power supplies--the one that is included in your order (shipping to countries with 120V, 60Hz power grids) powers the logic circuitry on the boards, and a second supply provides the power to the motors.

The first power supply has a center-positive, .215" OD, .082" ID barrel plug. Simply push the barrel plug into the connector on the board closest to the DB-9 connector (labled "Board Power" in Figure 1).

The second power supply powers the motors, and it can be either of the barrel plug type and connect to the second plug connector (labled "Motor Power" in Figure 1) or a power supply with terminal or lead wires that can be connected to the power terminal connector on the S100SMC.

If you plan to connect the power supply to the power terminal on the corner of the board, connect the ground lead to the terminal labled "Motor GND" in Figure 1, and connect the positive lead to the terminal labled "Motor V+" in Figure 1. The S100SMC can handle up to 50V and 5A, but very few motors will require this much power. If you do use a motor that draws a large amount of current or operates at a high voltage, monitor the heat of the motor carefully (all motors run hot, but overheating could cause failure) and connect heat sinks to the TIP 120 chips for added heat dissipation.

Stepper Motor Connections

The following table lists each of the motors we sell. To correctly connect your motor to the S100SMC, find the motor's model number on the left, and then place each colored wire in the terminal block position designated by the table. Position 3 for each motor connects the center taps of the stepper motor windings to V+, so for a 5 lead motor this position will hold 1 wire for each motor, for a 6 lead motor it will hold 2 wires for each motor, and for a 8 lead motor it will hold 4 wires for each motor, as noted in the table.

	Position
Motor	1	2	3	4	5
NEMA17BSM
NEMA17CSM
NEMA17DSM
NEMA17ESM
NEMA17FSM
NEMA23HSM
NEMA23KSM
NEMA23DSM
NEMA34BSM
NEMA23MSM
NEMA23NSM
NEMA23PSM
NEMA23ESM*	Bottom	Top	Bottom and Top	Bottom	Top
NEMA23LSM*	Bottom	Top	Bottom and Top	Bottom	Top
NEMA23QSM

For example, to connect our NEMA17BSM motor to the S100SMC controller, you would connect the black wire to position 1, the orange wire to position 2, the green wire and red wire to position 3, the brown wire to position 4, and the yellow wire to position 5.

If you would like to use your own motors with our S100SMC, setup is still easy. You will need to connect the center tap wires (1 wire in a 5-wire motor, 2 wires in a 6-wire motor, and 4 wires in an 8-wire motor) to positions 3. Then connect the 4 individual winding wires to positions 1, 2, 4, and 5. Connect the controller to the PC and power supplies and try rotating the motors. You will have to reposition the 4 winding wires until you have the correct order.

*NEMA23ESM and NEMA23LSM
The "Top" and "Bottom" above the wires for these two motors refer to the top and bottom stacks of the motor, as designated in the image to the left.

Limit Switches or Input Connections

In Figure 1 there are three positions shown on the left side of the board labled L0, L1, and L2. These positions on the terminal block are used to connect limit switches or other inputs to the S100SMC. The inputs must be activated by sending the appropriate signals to the S100SMC, either using our standard control software or using your own software or device and following the S100SMC's communications protocol. More information on activating the inputs using either of these methods can be found on the software instructions and communications protocol page.

Just below the limits is a terminal position labled "GND" in Figure 1. This position is connected to the ground of the board power supply. When one of the inputs is activated by software or otherwise and is brought to ground, the S100SMC senses the input as activated and takes the appropriate action, which normally means stopping all rotation.

Outputs

The outputs on the board use 2N7000 transistors to sink up to 200mA of current. This is more than enough to power LED's, small indicator lamps, relays, etc. They are activated using either our standard control software or using your own software or device and following the S100SMC's communications protocol. More information on activating the outputs using either of these methods can be found on the software instructions and communications protocol page.

The pin labled "+5V" in Figure 1 is a source for +5V, regulated by the L7805. This +5V source can be used for driving the various output devices you might connect to the board. However, keep in mind that the 2N7000's have a maximum current of 200mA.

Also, the +5V that comes from the pin labled "+5V" is coming from the board power supply. The supplies that ship with the board are normally in the 150mA to 300mA range. After the 89C52 chip and the status LED's take up around up to 100mA of the available current, there isn't much left for driving external devices. Thus, we recommend that you use relays or transistors and external power sources to drive any devices that require a great deal of current.

The following images show recommended methods for connecting LED's and relay's to the two S100SMC outputs:

If you have any questions about this page or anything else to do with our products, please either consult our FAQs page or contact us at info@steppercontrol.com or by filling out our contact form.