6: Networking and Security
EDS4100 4 Port Device Server User Guide 125
Disconnect Mode
Disconnect mode ends Accept mode and Connect mode connections. When
disconnecting, the EDS4100 shuts down connections gracefully.
The following three settings end a connection:
îš‹ The EDS4100 receives the stop character.
îš‹ The timeout period elapses and no activity is going in or out of the EDS4100. Both
Accept mode and Connect mode must be idle for the time frame.
îš‹ The EDS4100 observes the modem control inactive setting.
To clear out data from the serial buffers upon disconnecting, configure the EDS4100 to
flush serial data (see Tunnel – Disconnect Mode Page on page 57.
Packing Mode
Packing mode takes data from the serial port, groups it together, and sends it out to
nodes on the network. The groupings may be configured by size or by time intervals.
The following settings are configurable for Packing mode:
îš‹ Enable or disable Packing mode
îš‹ Packing mode timeout. Data that is packed for a specified period of time before being
sent out.
îš‹ Packing mode threshold. When the buffer fills to a specified amount of data and the
timeout has not elapsed, the EDS4100 packs the data and sends it out.
îš‹ Send character. Similar to a start or stop character, the EDS4100 packs data until it
sees the send character. When it sees the send character, the EDS4100 sends the
packed data and the send character in the packet.
îš‹ Trailing character. If a trailing character is defined, this character is appended to data
put on the network immediately following the send character.
Modem Emulation
The EDS4100 supports Modem Emulation mode for devices that transmit modem AT
commands. The EDS4100 supports two different modes:
îš‹ Command Mode: The EDS4100 serial ports accept modem commands that instruct
the EDS4100 to perform an action such as start or drop a connection.
îš‹ Data Mode: Serial data received in the EDS4100 serial port is sent through the active
network connection.
The Tunnel – Modem Emulation page lets you configure modem emulation settings for
up to four tunnels (see Tunnel – Modem Emulation Page on page 61). Each tunnel can
have different settings.
Note: When the EDS4100 serial port is in Modem Emulation mode, the serial
port remains in Command mode until an active tunnel is started. Once an active
tunnel starts, the serial port remains in Data mode until the connection is dropped
or the serial port is placed in Command mode by issuing the modem command
+++.
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