Modules SC1, SC2, and SC7 - (RS-232/422/485/423) Sync/Async

Modules SC1, SC2, and SC7 support intelligent, full duplex, independent, multi-channels that can be individually software-configured for either RS-232C, RS-422, RS-485, RS-423 (w/data and/or clk bit inversion for MIL-STD-188C unbalanced interface support), or synchronous or asynchronous communications. SC7 is the same as SC1 except SC7 reallocates the pins used for CTS Flow Control as four (4) additional system grounds.

The modules feature four programmable channels. Each channel can be programmed into a Loop-Back mode that internally wraps the transmitter around the receiver without the need of external wiring. Each channel also has its own Transmit and Receive buffers and the total aggregate buffer allocation is user-configurable/programmable up to 32 MB.

The modules can operate in an Interrupt-Driven Environment to provide notification of all events to the system. When a flow control mode is selected, the module performs the operation automatically with minimal system intervention. The module also can operate in Multi-Drop Link Mode, where the transmitters and receivers on up to 32 cards are tied together in either half- or full-duplex mode.

The architecture avoids latency problems because all data transfer is done in hardware rather than software. Any incoming data can be immediately extracted, no matter how many channels are active and regardless of the mode. A BREAK sequence capability is also incorporated. Bus data is transferred within 300 ns. The FPGA design simplifies programming and usage.