User guide

Chapter 5
Setup and Configuration
RUGGEDCOM ROS
User Guide
128 Configuring a Serial Port
Parameter Description
Enables forcing half-duplex mode of operation. While sending data out of the serial port,
all received data are ignored. This mode of operation is available only on ports that
operate in full-duplex mode.
Baud Synopsis: 100 to 230400
Default: 9600
The baud rate at which to operate the port.
Data Bits Synopsis: { 7, 8 }
Default: 8
The number of data bits to operate the port with.
Stop Synopsis: { 1, 1.5, 2 }
Default: 1
The number of stop bits to operate the port with.
Parity Synopsis: { None, Even, Odd }
Default: None
The parity to operate the port with.
Turnaround Synopsis: 0 to 1000
Default: 0 ms
The amount of delay (if any) to insert between the transmissions of individual messages
via the serial port. For Modbus protocol this value must be non-zero. It represents the
delay between sending a brodcast message and the next poll out of the serial port.
Because RTUs do not reply to a broadcast, enough time must be ensured to process it.
PostTX Delay Synopsis: 0 to 15
Default: 15 bits
The number of data bits needed to generate required delay with configured baudrate
after the last bit of the packet was sent out before serial UART starts listening to the RX
line. This value is relevant for RS485 interfaces only.
Hold Time Synopsis: 1 to 15000 ms or { off }
Default: off
The maximum amount of time, in milliseconds, that the serial packet can be held in
the queue before being sent to the serial line. Time is measured from the moment the
packet is received from the IP layer.
DSCP Synopsis: 0 to 63
Default: 0
Sets the DS byte in the IP header. DS byte setting is supported in the egress direction
only.
RXtoTX Delay Synopsis: 0 ms to 1000 ms
Default: 0 ms
The minimum amount of time, in milliseconds, that the transmission of a new message
delays after the last message is received through the serial port. This parameter is
especially useful for half duplex transmission modes, such as the two-wire RS485 serial
protocol. It provides the connected device with time to turn off its transmitter and to turn
on its receiver, helping to ensure that the device receives the next message without data
loss.
4. Click Apply.