The SBC83IL-D485M is a Single Board Computer (SBC) assembled with the PIC18F87J11 Microcontroller from Microchip, running at 48MHz. It has two RS-485 ports, two daughter board connectors, and two 14 pin IDC connectors. The RS-485 ports can be used as master or slave ports, and have DIP switches for enabling termination and bias resistors. On a RS-485 network, one node will normally have bias resistors enabled, and the two end nodes will have terminating resistors. The DIP switch can also be used to place the supply voltage on the RS-485 connector, which can be used to power other nodes on RS-485 bus. In addition it has one sMod port for adding serial peripherals (like SRAM, FLASH, EEPROM...), and one iMod port for adding an additional interface, like Ethernet for example.

Modtronix provides many free example projects written in C. They are written for the free Microchip MPLAB IDE and MPLAB C18 C Compiler.

The Microcontroller has 128KBytes internal FLASH and 3936 Bytes of internal SRAM. Additionally this boards has a 64KBit external EEPROM. It also has space for a 32MBit (4MByte) external FLASH, a 32KByte external SRAM, and a RTC with a Super Capacitor as battery. Note that the external FLASH, SRAM and RTC chips are not assembled!

There are plenty of Digital Inputs, Digital Outputs, Analog Inputs, PWMs and more available via two daughter board connectors and two 14 pin IDC connectors. Prototype daughter boards that make the signals on the daughter board connector available on prototyping space are available here.

The SBC83IL-D485M accepts a wide supply voltage from 4V to 20V. It has a dual 3.3V and 5.0V power supply, making it easy to interface with both 3.3V and 5.0V devices. By default, the 5V supply is not used. If required (on daughter board for example), the supply voltage has to be from 7V to 20V. All chips on the board are 3.3V, but the microcontroller's I/O pins are 5.0V tolerant, allowing it to interface with 5.0V devices. Very high quality, brand name capacitors and regulators are used for the power supply, guaranteeing many years of trouble free operation.

This board is assembled with very high quality, brand name components! Our goal is for this board to work error free for many years. For this reason, we do not use cheap components, or stress components to the limit of their capability! The quality of assembly, and reliability of components used sets this board apart from similar competitor products!

For details on the PIC18F87J11, download it's datasheet from www.microchip.com.

• Assembled with the Microchip PIC18F87J11 Microcontroller
• 128KBytes internal FLASH memory for program and constant data
• 48MHz Microcontroller Clock (12MHz crystal), with 12MIP Microcontroller execution speed
• 3936 Bytes of internal SRAM
• Very High quality assembly, with brand name, quality components. No cheap, “no name brand” components are used!
• Quality Voltage Regulators (Texas Instruments, ST or ON Semiconductors brand), with very high quality, brand name capacitors.
• External 8Kbyte I2C EEPROM
• 2.5V 0.5% Accurate voltage reference for ADC converter
• Filtered analog supply to CPU for accurate analog measurements
• One Presto iMod Port for adding interface like Ethernet for example.
• Daughter board connector with 48 pins for adding prototype board or LCD display
• Two 14 pin IDC connectors with power and 8 I/O ports each
• Micro Match connector with I2C bus. Please note that this is a 3.3V I2C bus, and should NOT be used with our 5V serial LCD displays! Some users have however reported using a 3.3V I2C bus on our 5V serial displays successfully.
• Red System LED on PIC port RB6.
• Pin header with jumper that can be mounted in 3 positions: Park, "C" or "F". Software can determine what position jumper is in, and for example use "C" position to restore default configuration, and "F" position to update firmware via bootloader.
• 2.1mm power connector for standard DC transformer.
• Very low supply current of 21mA. Can be reduced to 18mA by disabling 5V regulator, and future by disabling PLL in software and running CPU at 12MHz.
• Has an ICSP (In Circuit Serial Programming) connector (ICPC1 type) - CPU can be programmed and debugged in circuit. For details see Programming Modtronix PIC based boards.
• Free fully functional MPLAB C18 C Compiler available from www.microchip.com
• Is part of our Presto product range, can be used together with other Presto products. For details, click here.
• Wide operating voltage range from 4.5V to 20V.
• Wide operating temperature of -40 to 85°C.
• RoHS Compliant, Lead Free

Example projects for the SBC83IL and SBC83I SBC boards can be downloaded below. All code is written in C, and can be compiled using the free Microchip MPLAB IDE and MPLAB C18 Compiler (free student or lite version). The project contained in the “..\demos\pd162lcd” folder shows how to use the LCD display, buttons, LEDs and buzzer of the PD216LCD. The up and down button is used to scroll through menu options. The OK button is used to select a menu. The LCD contrast and backlight can be adjusted, and is stored in the external EEPROM of the SBC board (remembered after power is cycled). Picture 2 below shows the different screens of the sample program. Screens 2.1 and 3.1 are accessed by pressing OK on screen 1 and 2. This code can be used as a starting point for many projects, for example a RS-485 to RS-485 interface converter with LCD menus.