User`s guide

Configure Physical Serial Ports
Chapter 5 Configure Ports 98
freeKVM Configuration
freeKVM configuration is a link to the settings for configuring the freeKVM
feature. See "Configure and Use freeKVM" on page 168 for more information.
Advanced Serial Port Parameters
Serial port parameters is a link to the serial parameters for a port. When
attaching a serial device to the Digi Passport unit’s serial port, the serial port
parameters must match. The serial ports by default are enabled, allowing full
access to the port.
Advanced serial port parameters include:
• UART type: The type of UART (Universal Asynchronous Receiver/
Transmitter) in use to control the the Digi Passport unit’s interface to its
attached serial devices. On this page, UART type is read-only.
• Baudrate: The baud rate for the serial port in bits per second. The default
is 9600.
• Data bit: The bits that make up the transmitted data over the serial port.
Usually, seven or eight data bits are grouped together. Each group of data
bits in a transmission is preceded by a start bit and followed by an optional
parity bit as well as one or more stop bits. The default is 8 bits.
• Parity bit: The parity used with transmitted data over the serial port:
• None: No parity.
• Even: Even parity.
• Odd: Odd parity.
The default is none.
• Stop bit: The number of stop bits per character to use on the serial port.
The value used here must match the setting on the device connected to
this port. Use 1 or 2 stop bits. The default is 1 bit.
• Flow control: The kind of flow control is used on the serial port.
• None: No flow control.
• XON/XOFF: Software flow control (Xon/Xoff)
• Hardware: Hardware flow control (RTS/CTS).
The default is None.
• DTR option: DTR (Data Terminal Ready) can be set on the serial port to
one of three settings: Always HIGH, Always LOW, or High when open.
Setting the DTR to High when open keeps the DTR high if a TCP
connection is established. The default is High when open. When the host
mode is configured for dial-in modem or dial-in terminal server mode, the
DTR setting cannot be set by a user.
• Inter-character Timeout: This setting is only available when the host
mode protocol is set for RawTCP. The parameter sets the time value for the
Digi Passport unit to transfer data stored in the buffer. The Digi Passport
unit transfers data when the buffer is full using the TCP/IP protocol.
However, if it is not full, the Digi Passport unit will also transfer data
dependent on the timeout value selected.