![]() ![]() Many thanks to Ag Primatic for his tenacity and brilliant detective work, which made the SDCC port a reality much sooner than expected. The entire system described here for programming Vex with SDCC has been tested on FreeBSD, Linux, Mac OS X, and Windows with Cygwin. RoboCTL is a set of libraries and tools for communicating with robotics controllers such as Lego Mindstorms NXT and Vex. OpenVex is an open source firmware for PIC-based Vex robotics controllers, written from scratch using SDCC. SDCC (Small Device C Compiler) is an open source C compiler that supports several different micro-controllers. In harsh industrial environments, the on-board ESD protection component (for i version) diverts the potentially damaging charge away from sensitive circuit to protects the computer and equipment from the sudden and momentary electric current.Open Source Programming Tools for Vex: SDCC, OpenVex, and RoboCTL It can help cutting down on ground loops, common mode voltages and block voltage spikes, provide electrical isolation, and offer significant protection from serious over-voltage conditions in one circuit affecting the other. The on-board photo couplers use a short optical transmission path to transfer a signal between elements of a circuit, and keep the data lines electrically isolated. The data lines of each serial ports on i version VXC cards come with photocouplers design. It’s practical for large file transmission. ![]() The driver provides a maximum of 128 KB software FIFO for each COM port under Windows. Users may specify a COM port number manually by setting DIP switch, or let the driver choose an available number automatically. It is equipped with a 128-byte hardware FIFO for each port, supports for speed up to 115200 bps and is capable of transmitting information over a long distance communication link. Each port can be configured as either RS-485 for half-duplex or RS-422 for full-duplex communication. The VXC-144U/VEX-144 card provides 4 non-isolated RS-422/RS-485 serial ports and the VXC-144iU/VEX-144i card provides 4 isolated RS-422/RS-485 serial ports which tolerate isolation voltage up to 2.5 kV. ![]() Serial Communication Board with 4 RS-422/485 ports ![]()
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