SMP Gateway User Manual • 113
A TCP/IP loopback connection.
You set up this type of connection only if the device manufacturer’s application uses TCP/IP.
TCP/IP and virtual serial loopbacks do not require any further physical modifications to the
configuration.
To set up a real serial loopback connection:
Configure the device manufacturer’s application to use one of the PC’s serial ports, COM1 for
example.
Attach a null modem cable to this serial port.
Note: A null modem cable is an RS-232 cable that crosses the sending wire with the
receiving wire.
Instead of attaching the other end of the cable, to the device, attach it to a second serial port of
the same PC, for example COM2.
Note: Most modern PCs are equipped only with a single serial port. If virtual
communications ports are not supported by the application and the PC is only
equipped with a single serial port, a serial expansion card must be installed on
the PC.
14.2.3 Setting Up a List of Applications and Loopback
Connections
SMP Connect communicates with the device manufacturer’s application via a loopback
connection. There may be several applications running on the PC. You have to identify all the
available applications, and for each application that must remotely access a substation device, you
have to provide the following information:
Specify whether the application is to be started manually, identify the path to the application,
and provide any arguments required by the program.
Specify what type of loopback connection is to be used between SMP Connect and the
application, and define the communications settings of the loopback connection. Loopback
connection types are described in section 14.2.2, above.
To sta
rt SMP Connect:
Select your SMP Gateway in SMP Manager’s application window.
In the Tools menu, select SMP Connect.
The SMP Connect application window appears, showing a list of all the passthrough connections
you previously configured with SMP Config for this SMP Gateway.
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