SMP Gateway User Manual • 215
23 Using a Dial-Up Connection
for DNP3 or IEC 60870-5-
101
The SMP Gateway could need a dialup connection for DNP3 or IEC 60870-5-101 protocols in a
situation where there is no network between the SMP Gateway and the control center and you
cannot establish a network connection to the SMP Gateway using the procedures described under
“SMP Tools Remote Access to the SMP Gateway”, page 203.
If t
he control center uses the DNP3 or IEC 60870-5-101 protocol, you can establish a serial
connection, via a dial-up modem, between the SMP Gateway and the control center. The control
center will call the SMP Gateway.
The same holds true if you need to communicate between the SMP Gateway and a device that uses
DNP3 or IEC 60870-5-101and that supports a modem connection. The SMP Gateway will call the
device.
Communication via modem is available as an option on all SMP Gateway models. On the SMP 4,
you use an internal modem. However, you have to order the modem at the time you purchase the
SMP Gateway, and the modem port replaces one of the serial ports. On the SMP 16/CP and
SMP 16/SG, the modem is internal and has its own port. With the SMP 4-20 and SMP 8-40, you
have to use an external modem, which you plug into a serial port. Note that will all SMP Gateway
models, you can always plug an external modem into any serial port.
Having the SMP Gateway communicates, via dial-up modem with a PC or a device using DNP3
or IEC 60870-5-101, requires that you perform the following configuration steps with SMP
Config:
Define which serial ports have a modem.
Create a modem pool.
Add modems to the pool.
Create a modem pool master connection if the SMP Gateway will call a device, or create a
modem pool slave connection if the control center will call the SMP Gateway.
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