112 • SMP Gateway User Manual
SMP Gateway and specify here the port that will be used by the IED maintenance and/or
configuration programs; otherwise, the port must be the same as the one used by the
master protocol.
Suspend Link.
This setting indicates that data acquisition should be suspended for all other devices
sharing the multidrop link while SMP Connect is communicating with the selected
device. If selected, acquisition of the remaining devices will be suspended. This setting
applies only to devices that support the feature.
Suspend IED.
This device-specific setting indicates whether or not the master protocol component
should suspend data acquisition while SMP Connect is communicating with the device.
IED Address.
This address identifies the device in a multidrop configuration. This setting is ignored if
the Suspend IED checkbox is not selected.
Modem Signals.
This setting specifies whether or not the serial port associated with the IED supports
modem control signals. If selected, the DTR and RTS modem control signals will be
transferred across the passthrough connection. By default, modem control signals are
NOT transferred.
Locked at Startup.
This setting is a security feature. If selected, the passthrough connection will not be
available when the SMP Gateway starts up. You can subsequently make it available by
enabling specific logical data points, as explained under “Locking Incoming RAS and
Passth
rough Connections”, page 106.
Inactivity Timeout.
This mandatory setting specifies how long the passthrough connection link established by
SMP Connect can remain inactive. If the program detects that no data exchange occurred
between the device and the application during the specified timeout period, it prompts the
user to either terminate the session or specify a longer wait time.
Comments.
This optional setting is used to store the instructions that will be displayed to the SMP
Connect operator, such as telling him which communications program to use with the
device.
14.2.2 Installing a Loopback Cable, if Necessary
There are 3 types of loopback connections that you can set up between the device manufacturer’s
maintenance or configuration application and SMP Connect:
A virtual serial loopback connection.
This is the preferred choice.
A real serial loopback connection.
You set up this type of connection only if the device manufacturer’s application cannot use a
virtual communications port.
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