Embedded PIC based SBC board with RS485 and CAN BUS interface

SBC28PC-IR4

US$25.95

Click to enlarge

Compact Single board computer for 28 pin PIC with RS485 and CAN BUS interface, fully assembled. CPU not included. Quantity discounts up to 30% available, for details click here.

Product Datasheet in PDF format (26 April 2005)

(Click here for archived documentation)

Description

The SBC28PC is a single board computer for 28 pin PIC microcontrollers. It has a RS485 interface that is available via a 3 pin molex connector and a 5 pin 3.81mm terminal block connector (can be configured via solder straps to be available on terminal block connector). It has a socket for a MCP2551 CAN BUS driver chip. When the CAN BUS driver chip is inserted, the CAN signals are available on the 5 pin terminal block connector. Some examples of 28 pin DIP PIC chips that this board is designed for (There are many more!):

PIC18F242, PIC18F252, PIC18F248 (CAN), PIC18F258 (CAN)
PIC18F2320, PIC18F2410, PIC18F2680 (CAN BUS), PIC18F2550 (USB)
PIC16F870, PIC16F873(A), PIC16F876(A)
PIC16C63, PIC16C66, PIC16C73(A), PIC16F73, PIC16C76, PIC16F76

This is only because the above mentioned chips have internal USARTs, which are connected to the serial drivers on this board. It can however also be used with most other 28 pin DIP PIC chips, as long as their power, reset(MCLR) and oscillator pins are situated in the same place as the chips listed above. The only difference is that if a USART is required, it will have to be done with software on the PIC chip. Examples of other PIC chips that can be used are:

PIC16F872
PIC16C62(A), PIC16C72
Many more PIC chips that match the above mentioned criteria!

When using this board with the CAN driver chip, it must be used with a PIC chip that has an onboard CAN peripheral, like the PIC18F248, PIC18F258, PIC18F2680.... chips.
This board can also be used with the PIC18F2550 PIC with built in USB. In this case, the user can add a USB socket to a prototype Daughter or Frontend board for example.

By default these boards don't have crystals assembled. A Crystal is not required seeing that all PIC chips have built in crystals. Typically the built in crystal is 4MHz or 8MHz. If a higher or special clock rates is required, it can be selected via the options below. For example, if this board is going to be used to communicate at a standard BAUD rate (9600, 19200, 38400, 57600, 115200...), then the 18.432MHz crystal should be selected below. With this crystal, the exact BAUD rate can be obtained with 0% error.

Features

22 I/O ports when using common PIC chips, for example the PIC16F876A or PIC18F252.
Is part of our MicroX product range, and has a Frontend and Compact Daughter board connector for expansion. For details see www.modtronix.com/microx.
Compact size of 58mm x 54mm. For details see www.modtronix.com/microx/dimensions.
Assembled with High Quality, Industrial Temperature components - electrolytic capacitors used are extra long lifetime rated!
Diode protected 2.1mm power connector for a standard DC transformer.
Wide operating voltage range from 7 – 30V.
On board 15kV ESD protected RS485 interface. Assembled with industrial temperature range interface driver chip.
5 pin 3.81mm terminal block connector with RS485 or CAN BUS signals (when CAN interface driver is assembled), ground and external power.
The power pin on the 5 pin terminal block connector can be connected to the boards unregulated power supply (the input of the 2.1mm power connector) via a strap. This can be used to:
- Provide power for all other boards daisy chained to this one. For this to work this board must be powered via its 2.1mm power connector! It will supply power to all other boards daisy chained to it.
- Obtain power for this board. In this case no power has to be supplied via the 2.1mm power connector. It will obtain it's power via the 5 pin terminal block connector.
Power LED to indicate when device is powered.
Micro Match socket with Power, I2C and SPI signals. The Micro Match connector can be used to daisy chain multiple I2C devices together, like our LCD2S Serial LCD displays with keyboard decoder. For details, click here.
Has an ICSP (In Circuit Serial Programming) connector (ICPC1 type) - CPU can be programmed in circuit. For details see Programming Modtronix PIC based boards.

Expansion

The SBC28PC's Daughter and Frontend Connectors can be used as expansion ports to add additional functionality. It contains all free CPU port pins, power, I2C, SPI, RS485 signal,..... For further details about the Daughter and Frontend Expansion Port, see www.modtronix.com/microx/expansion.

The SBC28PC-IR4 can be used as a daughter board on the following boards currently available from Modtronix Engineering:

•	IOR5E - Input-Output-Relay Board with enclosure
•	PT10E-ASM - Prototype Board with enclosure
•	PT24E-ASM - Prototype Board with enclosure

The following Daughter Boards for the SBC28PC are currently available from Modtronix Engineering:

•	DEV7TC - Seven Segment Display Daughter Board
•	PT01TC-ASM - Daughter Prototype Board

The following Frontend Boards for the SBC28PC are currently available from Modtronix Engineering:

•	IOR44-222 - 2 Input, 2 Output, 2 Relay Frontend Board
•	IOR44-42 - 4 Input, 2 Relay Frontend Board
•	IOR44-241 - 2 Input, 4 Output, 1 Relay Frontend Board
•	SER2S - Sub-D Connector Frontend Board
•	IO8S - 8 port Analog/Digital I/O Frontend Board
•	PTO1FC-ASM - Compact Frontend Prototype Board

The following I2C devices can currently be connected to this board via it's Micro Match connector:
•	Serial 16x2 LCD Character Displays - Serial LCD displays with keypad encoder and user I/Os
•	Serial 20x4 LCD Character Displays - Serial LCD displays with keypad encoder and user I/Os

Click to enlarge

Additionally, users can download PCB templates for creating their own Frontend expansion boards from our Downloads page.

CAN BUS to RS485 interface converter

When connecting the SER2S Sub-D connector expansion board to this board it can be used as a CAN BUS to RS485 interface converter - see picture above. For this to work, the CAN BUS driver chip must be inserted, and a PIC chip with an onboard CAN peripheral must be used, like the PIC18F258. The RS485 bus can be read and written to via the PICs USART. RS485 signal A is connected to pin 3 of the Sub-D connector, signal B to pin 2, and ground to pin 5.

Details, Schematics and Partlist

Product Datasheet in PDF format (26 April 2005)

(Click here for archived documentation)

Application Notes and Source Code

	Web Page	PDF File
CAN Application notes From Microchip.
Programming Modtronix PIC based boards

Additional source code and user contributions for this board is located on our file download page. If anyone has any code they would like to contribute, please upload it onto our file download page for other users!
There is also a forum for the Modtronix site.

Buy Online

This product consists of:

SBC28PC-IR4 SBC Main Board, fully assembled, as shown in
TB05FS381 5 pin, 3.81mm terminal block plug

The following is NOT included, and can be added below as "Available Options":

PIC Microcontroller
Crystal - For details see description above

Select desired options, and then click on Add to Cart icon below!

Available Options:
CAB3S6FT Serial Port Cable (info):
Crystal Assembled:
Frontend Sockets (info):
Line Drivers:
PIC CPU included:
Printed Documentation:

This product was added to our catalog on Friday 18 June, 2004.

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