SATEC SA300 ezPAC Operation Manual - Manual (Page 57)

Chapter 6 Using PAS Setting up Communications
SA300 Substation Automation Unit 57
The “Break Time-out” box defines the maximum idle time that PAS waits after
receiving the last message character to close a connection. This setting is important
only when PAS is running the Modbus RTU or DNP3 protocol. It does not affect
Modbus ASCII communications. The default value of 10 ms is usually sufficient for
reliable communications, but the load on your PC can affect it. If there are many
applications running on your PC, PAS might be prevented from responding to
received characters fast enough, so it may close the communication while the device
is still transmitting a message. If you frequently receive the message “Communication
failed”, this could mean that “Break Time-out” should be increased. This time is
added to the message transfer time, however, increasing it excessively slows down
communications.
The “Retries” box defines the number of attempts that PAS uses to receive a
response from the device in the event the communication fails before announcing a
communication failure.
Configuring a Serial Port
1. On the Connection tab, select a COM port from the “Device” box,
and then click Configure.
2. Specify the baud rate and data format for the port. Choose the
same baud rate and data format as you have set in the device, and
then click OK.
Communicating through a Modem
Selecting the Communications Protocol
On the Connection tab, click Protocol, and then select the protocol settings as shown
above for a serial port.
Configuring a Modem
1. On the Connection tab, select from the “Device” box a local
modem installed on your PC through which you communicate with
your device.
2. Click on Phones to add the phone number of the remote device to
the phone list.
3. Type the phone number in the “Phone number” box, add
comments if you desire, click Add, and then click OK.
4. From the “Phone number” box on the Connection tab, select the
phone number from the list, and then click OK.
Communicating through the Internet
1. Click on the Connection tab.
2. Click on the “IP address” and type in the IP address of the SA300.