Best Data CMX300 Specifications download pdf (Page 24)

CM-X300 CoM

24 CM-X300 Reference Guide Rev 1.31 30-Dec-2010

Figure 4 Magnetic Interconnect Schematic

Figure 5 DC Source for Magnetic Center Taps

3.3.5 Serial Ports

CM-X300 incorporates 3 UARTs: one full function UART, one RX-TX only (console)

UART and one partial-function UART. All three UARTs share the same feature list, baud

rates and use the same programming model.

The UARTs share the following features:

 Functionally compatible with 16550A and 16750

 Ability to add or delete standard asynchronous communications bits (start, stop, and

parity) in the serial data

 Independently controlled transmit, receive, line status, and data-set interrupts

 Modem control functions (nCTS and nRTS on two of the three UARTs. The full-

function UART additionally has nDSR, nDTR, nRI, and nDCD signals)

 Auto-flow capability controls data I/O without generating interrupts:

 nRTS (output) controlled by UART Receive FIFO

 nCTS (input) from modem controls UART transmitter

 Programmable serial interface:

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Best Data CMX300 Specifications Page 24