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UltraPort Serial Adaptors User Guide
Installing under Windows 95 and 98
Page 29
Chapter 2 Installing drivers and host cards
Line Termination: The line termination parameter is not changeable by the user in EIA-232
mode. However both EIA-422 and EIA-485 modes are defaulted to disabled but can be
enabled by the user if needed.
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.
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.
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.
Note
The port must be closed and then opened for the new parameters to
take effect.