Signal Consulting, LLC  Model Si25NeBdMC1-50V-20A

Networkable, Bidirectional, Open-Loop, 50V 20A, Motor Controller with RS232 Serial Port, Integrated Heat Sink and with 20kHz or 5kHz PWM, B-Chip

Si25NeBdMC1-50V-20A Features: Efficient H-Bridge: for Bidirectional Current Control Directional Control: with ASCII Command-Characters Max. Current for 5 sec : 40A with Proper Heat-Sink Installed Max. Continuous Current: 20A with Proper Heat-Sink Two User Selectable PWM Frequency: 5KHz or 20kHz Two User Selectable Motor Acceleration/Deceleration Modes:  Using Jumper on Port J1.  Networkable RS232 Port: For Set Duty-Cycle Input, and for Measured Duty-Cycle Output. Up to 16 Boards can be interconnected to form a 3-wire Local Area Network, LAN. Optional LCD Port: For Set and Measured RPM Display High Power-Efficiency: 98.5% typical, at 50V and 20A Optically Isolated Directional Control Signals Power Semiconductors: Four 60A Hex-MOSFETs Board's Size: 2.9" x 2.9" x 1.9" (7.4cm x 7.4cm x 4.8cm). Components Type: 100% Solid State, NO Relays On Board: Filter Capacitors VTS diodes Snubber Circuit Ready   Bicolor LED Indicator,  (red=forward,  green= reverse) Voltage Requirement: A single DC Source Voltage (unregulated and Unfiltered) with any voltage value from 9V to 50V (for Vp) Si25NeBdMC1-50V-20A  Spec Sheet  (PDF)

A Typical Application of the Si25NeBdMC1-50V-20A

 In this open-loop application, the PWM or motor speed (in forward or reverse direction) is adjusted by command strings derived from a Personal Computer (PC) using the Microsoft “Hyper Terminal” program (or any-other ASCII controller) operating at 9600 Baud, 1 start-bit, 8 data-bits, 1 stop-bit, No parity-bit. The optional LCD module can be ordered from Signal as part number of Si24LCD2L20CH  (2x20 display with 8” ribbon cable and 14-pin connector, and with back-light). Warning:  The connecting wires to the Load and the Power Supply must be heavy gauge copper wire (#12 AWG or heavier) to handle the rated current level. In addition, these heavy gauge wires act as a heat sink, protecting the board from overheating.

 Command Format and Local Area Network (LAN) for the Si25NeBdMC1-50V-20A

Each board has a unique, 8-bit, ASCII, none-volatile, Node-Address ranging from 1….9, A..Z, a,…z ( or a total of 61 Units can be networked). The address can be changed by a LAN command (the factory default address is 1). The board uses a modified version of the RS232 serial-data communication standard, where the output-voltage (on pin I2, CN6) ranges from 0 to +5V (rather than the usual -12V to +12V). In addition, this output pin is normally an open circuit and it will only output a serial TTL binary bit-stream when properly referenced by its Node-Address. The serial data input-voltage (on pin I1, CN6) has the standard range of -12V to +12V. The serial data-format is: 9600 Baud Rate, 1 Start-Bit, 8 Data-Bits, 1 Stop-Bit, and no Parity-Bit.

These features allow the creation of a Local Area Network (LAN) with up to 61 nodes (boards). A typical 3-wire LAN with “Star Topology” is shown below. Note that the control lines (G, I1, I2) with the same name are connected together (or the boards are connected in parallel) and driven by an ASCII controller (or PC), equipped with an RS232 serial port, operating at 9600 Baud rate.

Command Rules:

1.  All Commands are ASCII character strings (Chars.).  An ASCII string is denoted here with Bold Red Letters (Characters).

2.  Each string is terminated by a Carriage Return Character, (CR). The only exception is the # command.

3.  Upper-Case Letters are used for Output Commands; and Lower-Case Letters are used for Input Commands.

4. The 1^st Char. in a string is either ASCII # or a Node Address  (1..,9, A,..Z, a,…,z). If the 1^st Char. is an #, it denotes a query to all boards on the LAN to output their Node Address and Program Name.

5. If the 1^st Char.  is a ASCII (1..,9, A,..Z, a,…,z), it directs the rest of the command string to the board that has this address.

6. The 2^nd Char. in the string is the Command Character that operates on the addressed board.

7. The 3^rd, 4^th, 5^th and 6^th Chars. represents the value of the input data. Where + numbers denote forward rotational values; and - numbers denote reverse rotational values.

8. The last Char. in the sequence is always the string terminator, (CR).

Command Examples:

Ex#1.  Com. String:  #   Action: All boards on the LAN will output their Address and Program Name.

Ex#2.  Com. String:  1u5(CR)       Action: Change Board 1 Address in EPROM from 1 to 5.

Ex#3.  Com. String:  1D(CR)        Action:  Board 1 outputs its Set and Measured % PWM (0,..100.0%).  

Ex#4.  Com. String:  2d25(CR)      Action: Change Board 2 PWM to 25.0% in Forward Direction.

Ex#5. Com. String:  2d+25.0(CR)   Action: Change Board 2 PWM to 25.0% in Forward Direction.

Ex#6.  Com. String:  2d-25(CR)     Action: Change Board 2 PWM to 25.0% in Reverse Direction.

Ex#7. Com. String:  2d-25.0(CR)    Action: Change Board 2 PWM to 25.0% in Reverse Direction.

Ex#8.  Com. String:  1M(CR)       Action:  Board 1 outputs its Set and Measured Motor Value (0,..120).

Ex#9. Com. String:   2m+60(CR)   Action: Change Board 2 Motor Value to 60 = +50% PWM, in Forward Direction.

Ex#10.  Com. String:  2m-60(CR)    Action: Change Board 2 Motor Value to -50 = -25.0% PWM in Reverse Direction.

We recommend that you use approximately 25msec delays (or longer) between characters when inputting a command string (“1d..(CR)”,“1m..(CR)”, “1D(CR)” or “1M(CR)”) to this controller board. 

Occasionally, a transient character may be captured and buffered by one more board on the LAN, this transient character can be cleared by sending one  or more (CR) prior to a valid command string. 

Note1: The m command inputs decimal integer Motor Values, ranging from -120,….,0,….+120. The positive values are used for forward speed control, while the negative Motor Values are used for reverse speed control. The PWM duty-cycle varies linearly with the input values; 0 value is equal to 0% PWM, while 120 value is equal to 100% PWM.

Note2: The d command uses a variable input format (integer or fractional) % PWM Motor Values, ranging from -100.0,…., 0.0,….+100.0. The positive % PWM Motor values are used for forward speed control, while the negative % PWM Motor Values used for reverse speed control.

Note3: The d command is subject to +, - 0.833% “round-off” errors, while the m command is NOT!!!

LCD Display Format:

 LCD Line#1 is used to display Set Values. While LCD Line#2 is used to display Measured Values.

The Display Format depends on the last LAN Command used:

The d command provides variable decimal display format (+ - 00.0%,…100.0%).

The on-board microprocessor provides the bus arbitration, required to avoid data collisions on the 3-wire LAN bus.

Network Configuration:

The  Si..Ne.. boards can be arranged in many Local Area Network (LAN)  topologies: Star, Daisy-Chain, etc.  You may create your own network or you may order one or more of the Network Cable Assemblies  listed below.   Before you build a network, we recommend that you click on this blue link and read this Application Note:  SigNote on Configuring a LAN-2 .

Availability: We usually ship in 2-3 business days.

All Products Are Proudly Made in the USA