User manual

set switches
Chapter 2 Command Descriptions 209
Options range=range
The port or range of ports to which this command applies.
mode={232|485}
Selects the electrical interface of the serial port. The selected value
determines whether the "wires" and "termination" options are meaningful.
232
The serial port uses electrical interface EIA-232. This interface uses
independent wires to transmit and receive data, which allows data to
be sent and received between devices simultaneously.
485
The serial port uses electrical interface EIA-485. This mode can also
be used for EIA-422 connections. This interface uses two wires to both
transmit and receive data. This interface also allows for multiple
transmitters and receivers to be easily connected together.
The "wires" and "termination" command options specifically apply to
serial ports in EIA-485 mode.
The default is "232."
wires={two|four}
Applies when the serial port is running in EIA-485 mode only. Selects the
number of differential wires used for communication and implicitly
determines the duplex of the connection.
two
The serial port operates in two-wire mode. This mode is a half-duplex
connection with shared transmit and receive wires.
four
The serial port operates in four-wire mode. This mode is a full-duplex
connection with independent transmit and receive pairs.
The default is "four."
termination={on|off}
Applies when the serial port is running in EIA-485 mode only. Determines
whether termination and biasing resistors are used across the lines.
on
Termination and biasing resistors are enabled across the lines.
Termination should be set to "on" if this node is an endpoint of the 485
network. Biasing should be used in at least one unit in a two-wire
environment.
off
Termination and biasing resistors are disabled across the lines.
The default is "off."