Westermo MRD-3x0 - Manual (Page 182)

182 6623-3201
Connection timeout
When this field is set to a value greater than 0, the serial serv-
er will close connections that have had no network receive
activity for longer than the specified period
Transmission mode
Select RTU or ASCII, based on the Modbus slave equipment
attached to the port.
Response timeout
This is the timeout (in milliseconds) to wait for a response
from a serial slave device before retrying the request or
returning an error to the Modbus master.
RTU framing timeout
This is the timeout (in milliseconds) the the serial server will
use to determine the boundaries of Modbus/RTU packets
received on the serial port.
Retries
Should no valid response be recieved from a Modbus slave,
the value in this field determines the number of times the
serial server will retransmit requests before giving up.
For information on setting the Port Configuration, see section
7.2.1.