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Advanced
Advanced
Advanced Serial Settings Tab
Overview
Advanced serial port settings apply to all serial ports.
Field Descriptions
Configure the following parameters:
Flush Data Before
Closing Serial Port
When enabled, deletes any pending data when a port is closed.
Default: Disabled
Deny Multiple
Network
Connections
Allows only one network connection at a time per a serial port. Application
accessing a serial port device across a network with get a connection (socket)
refused until:
z All data from previous connections on that serial port has drained
z There are no other connections
z Up to a 1 second interconnection poll timer has expired
This also enables a per-connection TCP keepalive feature. After approximately
3 minutes of network connection idle time, the connection will send a
gratuitous ACK to the network peer, thus either ensuring the connection stays
active OR causing a dropped connection condition to be recognized by all peer
network connections.
Applications using this feature need to be aware that there can be some
considerable delay between a network disconnection and the port being
available for the next connection attempt, allowing any data sent on prior
connections to be transmitted out of the serial port. Application network retry
logic needs to accommodate this feature.
Default: Disabled
Monitor
Connection
Interval Status
Specify how often, in seconds, the IOLAN will send a TCP Keepalive to
services that support TCP Keepalive.
Default: 30 seconds