JetCard 1402 uses an Oxford OXmPCI954 chip, a 2-port Universal Asynchronous Receiver Transmitter, well-known for its high performance. Each UART channel in the JetCard offers data transmission speeds up to 921.6 Kbps and bi-directional 128-byte FIFO for each port. Deep FIFO can reduce the CPU loading, saving CPU resources for other important tasks. This chip also allows JetCard to be compatible with the widely used industry-standard 16C950 devices and PCI bus.

In addition to high speeds of 921.6 Kbps and 128-byte FIFO, Oxford chip also equips JetCard with on-board flow control function. Instead of using a driver on the PC to control the traffic flow, JetCard uses the on- board flow control function to react directly without waiting for the PC to respond. In this way, the response time and CPU loading can be largely reduced, greatly enhancing system performance. You can either choose software flow control which uses Tx and Rx to send/receive XON/XOFF signals, or select hardware flow control which uses CTS#/RTS# to sent/receive the signals. The flow control function is to prevent FIFO from overflowing.

JetCard is ideally suitable for PC applications, enabling PC users to take advantage of the maximum performance of analog modem or ISDN terminal adapters. JetCard is also suitable for any communications that require high speed RS-232/RS-422/RS-485 interfaces.

JetCard 1402 also comes with on-board Automatic Flow Direction Switching Technology. Under a multi-drop 2-wire RS-485 mode, the timing for switching between Idle Mode (data not being transmitted) and Active mode (data being transmitted) must be precise and accurate. With this technology, JetCard can effectively increase RS-485 transmission performance, and relieve the PC from the burden of using the driver to switch modes.

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