The newly introduced OZSCR1000 SCR firing board is capable of controlling a wide range of commercially available SCRs. SCRs operate similarly to diodes, with current flowing in only one direction through the device. In both SCRs and diodes, current cannot pass through the device until the anode is at a higher potential than the cathode, or what is referred to as forward bias. SCRs add additional control by delaying the flow of current until a control signal is also provided to enable a forward biased device. Current will continue to flow in an SCR until the device is reverse biased. Once an SCR turns off, it will not conduct current again until it has forward bias applied and the control signal is applied.
President Obama signed the Tax Relief, Unemployment Insurance Reauthorization, and Job Creation Act of 2010 on Friday, December 17th, 2010. This will extend the Section 1603 Treasury Grant Program.
For our SCR1000 board, we needed to implement a Modbus stack for communicating with the board over RS-485. We have previously ported the FreeMODBUS stack to the Texas Instruments 28335 for use on the OZDSP3000 board, so again we selected FreeMODBUS for use on the Stellaris part that controls the SCR1000.