User manual

IMON-U300/310
Functions
83
In order to enable incoming connectionsin "Connection on request"
mode as well, select in the "Accept incoming connection" section either
the radio button "TCP" or "Modbus TCP" and enter the port, on which
the serial Ethernet gateway reacts on incoming connections, into the
"Port" field. If "TCP" is selected, the serial Ethernet gateway monitors the
port for incoming connections for transparent data transmission. This
port is not necessary if IPT is used. Every incoming IPT connection will
then be accepted. It is possible to allow outgoing and incoming
connections simultaneously. If an incoming or outgoing connection is
active in this case, the other is not available until the active connection is
closed. If "Modbus TCP" is selected, the serial Ethernet gateway operates
as Modbus TCP to RTU gateway. It accepts incoming Modbus TCP
connections at the configured port (e.g. standard Modbus port: 502). It
acts like a Modbus TCP Slave in doing so. All incoming requests are
output at the serial interface as Modbus RTU requests and the replies
from the Modbus RTU Slave are sent back to the Modbus TCP Master.
All outgoing connections are disabled in this mode.
In order to limit incoming connections to the local network, check the
checkbox “only local connections permitted”. No connections will then
be accepted via the WAN interface.
In order to specify that the connection is only accepted, if an UDP or TCP
authentication of an INSYS VCom® has been performed before, select in
the "VCOM® authentication" section for "incoming" either the radio
button "UDP" or "TCP". An existing connection will be terminated by a
VCom® authentication during the existing connection. This setting is
ignored if IPT is used.
In order to specify that an ATD dialling command triggers an outgoing
connection, select in the "Outgoing connection" section the radio button
"triggered by dialling command ATD". Then, the serial interface will be
operated in AT command mode and a connection must be initiated by an
ATD or ATDT command. The Serial Ethernet Gateway expects the
dialling command ATD or ATDT via the serial interface with the
destination as IP address or domain name, followed by the TCP port
(e.g.: ATD192.168.1.1:1234 or ATD"name.company.com":1234. When
using IPT, only the IPT number is specified here (e.g.: "ATD12345").
In order to specify that a character on the serial interface triggers an
outgoing connection, select in the "Outgoing connection" section the
radio button "triggered by serial character". Then, a connection will be
established as soon as the serial interface receives a character. A
destination must be specified in this operation mode. Enter the IP
address or the domain name of the target into the "IP address or domain
name" field as well as the port into the "Port" field. Alternatively, enter
for an IPT connection the IPT number into the "IPT dial number" field. A
secondary target can be entered optionally, to which a connection will be
established if the primary target is not available. If the connection set-up
fails, a new connection set-up cannot be performed before 5 minutes
have expired.