Chapter 4 Using PAS Software
Setting up Communications
EM720 Power Quality and Revenue Meter
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Selecting the Communications Protocol
1. On the Connection tab, click Protocol.
2. In the “Protocol” box, select the same communications
protocol as you have set in your device.
3. The remaining settings in this dialog do not normally
need to be changed.
4. In the “Response Time-out” box, define the maximum
time that PAS should wait for the meter response
before announcing a failure. When communicating
through a GPRS modem, this time may require some
adjustment.
5. In the “Break Time-out” box, define the maximum
character idle time that PAS should wait after receiving
the last message character to close a connection when
using the Modbus RTU or DNP3 protocol. It does not
affect Modbus ASCII communications. If there are
many applications running on your PC, PAS might be
prevented from responding to received characters fast
enough and may close the communication while the
device is still transmitting. If you frequently receive
the “Communication error” message, try to increase
“Break Time-out”. This time is added to the message
transfer time, and excessive increasing it may slow
down communications.
6. In the “Retries” box, define the number of attempts
that PAS should use to receive a response from the
meter in the event the communication fails, before
announcing a communication failure.
Communicating through the Internet
If you are communicating through the Ethernet port, define
the IP address of your meter on the network.
1. On the Instrument Setup tab, select Internet Site.
2. Click on the Connection tab.
3. Click on the “IP address” and type in the IP address of
your meter. The default meter IP address preset at the
factory is 192.168.0.203.
