UltraPort Serial Adaptors User Guide
Installing under Linux Page 94
Chapter 2 Installing drivers and host cards
(-e) EIA-485 HDX Local Echo: Local echo by default is on. This parameter applies only to EIA-485
half duplex mode. All characters will be echoed to the user and transmitted across the serial ports.
Some EIA-485 applications require local echo to be enable in order to monitor the loopback data to
determine that line contention has occurred. If your application cannot handle loopback data the local
echo should be disabled.
(-a) EIA-485 TX Driver Control: The default for this field is AUTO. When Auto is set the UltraPort SI
will automatically detect the beginning and the ending of data being transmitted in order to enable and
disable the transmit line. When the field is set to RTS it is the host application’s responsibility to enable
and disable the transmit line via the RTS handshake line when it wants to send data.
(-b) Auto EIA-485 Bit Delay: By default this field is set to 0 delay. This field is only applicable if you
have configured EIA-485 TX Driver Control to AUTO. Values for this field are 0 through 15 bits.
(-h) Help: Displays the setultrap usage screen.
The following examples show typical user applications:
etc/setultrap -f /dev/ttyPS0,/dev/ttyPS15- l -lists options configured for serial ports 1 through
16
etc/setultrap -f /dev/ttyPS0,/dev/ttyPS15 -m 422 -sets serial port 1 through 16 to interface
type EIA-422
etc/setultrap -f /dev/ttyPS0,/dev/ttyPS3 -m 485fdx -configures ports 1 to 4 to EIA-485 full
duplex
etc/setultrap -f /dev/ttyPS1 -m 485hdx -t term -b 5 -sets serial port ttyPS1 to EIA-485 half
duplex termination enabled, control bit-delay 5
These commands may be added to a startup script to cause them to run automatically
whenever the system is started. A sample commented out startup script is (/etc/init.d/
rc.setultrap) supplied with this driver.
Uninstalling the UltraPort Driver for Linux
To uninstall the driver enter the following command:
rpm -e perle-serial
Note
The port must be closed and then opened for the new parameters to
take effect.