Serial
Used to set parameters related to the device's two serial ports. COM2 has RS-485, COM1 does not.
There are tabs for basic and advanced parameters.
Baud Rate
Baud rate in bits per second (bps).
Most common is 9600 bps.
Parity
Type of parity.
N = no parity
O = odd parity
E = even parity
Most common is 'N'.
Data
Number of data bits.
Most common is 8.
Stop
Number of stop bits.
Most common is 1.
EoT Delay
Delay in milliseconds used to mark the end of a transmission.
Modbus standard is 3.5 character times or approximately 4ms at 9600baud.
RTS Keying
Used to enable and disable flow control.
Key Delay
Milliseconds of key delay to wait prior to sending the message.
RS-485
There are two COM2 serial ports on the RIO. One supports RS-232 and
the other supports RS-485. This option is used to enable RS-485 two wire or four wire.
If 'NONE' is selected the RS-485 serial port is not enabled and only the RS-232 port
can be used. The RS-232 port is always enabled and can be used even when RS-485 is disabled.