user manual

Functional Description
4-12
4
❏ Parallel (printer) port
❏ Ethernet transceiver interface
❏ SCSI mass storage interface
Serial Port Interface
The CD2401 serial controller chip (SCC) is used to implement the
four serial ports. The serial ports support the standard baud rates
(110 to 38.4K baud). The four serial ports are different functionally
because of the limited number of pins on the P2 I/O connector.
Serial port 1 is a minimum function asynchronous port. It uses:
❏ RXD
❏ CTS
❏ TXD
❏ RTS
Serial ports 2 and 3 are full function asynchronous ports. They use:
❏ RXD
❏ CTS
❏ DCD
❏ TXD
❏ RTS
❏ DTR
Serial port 4 is a full function asynchronous or synchronous port. It
can operate at synchronous bit rates up to 64 k bits per second. It
uses:
❏ RXD
❏ CTS
❏ DCD