6 INSTALLING COMMUNICATION EQUIPMENT
The communication between the SQL server and the measuring device can be implemented in a
number of ways. This section covers the various options, including the brands recommended and
sold by Unipower. The meter have standard interfaces and are not restricted to particular brands, but
if you use other brands, please refer to the relevant user guides.
For details of how PQ Online works, see the user manual for PQ Secure.
6.1 Ethernet
The meter use 10/100Base-T (10/100 Mbps) for Ethernet communication. If a higher speed is being
used in the network you can connect a 1000BaseT/100BaseT-switch or converter between the
network and the UP-2210. The UP-2210 has a standard RJ-45 connector and is connected to the
network using a standard patch cable. The Unilyzer 902 measuring device is equipped with a cable
already fitted with the contact, allowing it to be connected directly to a network output.
To establish an Ethernet communication this option shall of course be activated in the instrument,
and configured for this kind of communication with PQ Online.
The meter must be given a unique IP-address. Consult with your network administrator, which IP-
address you can use.
If the meter is behind a firewall in the network it is necessary to configure the firewall to open UDP-
port 16421 to be able to access the meter from outside the firewall.
For more information about PQ Online, please see the “PQ Secure SQL User and software
installation manual”.
6.2 External modem
Modems are a common method used for communication between instrument and office. Unipower
recommends the 3Com US Robotics 56K FAX modem, because it is in widespread use and is
reliable. Another advantage is that it uses Hayes commands, which is an essential part of
communication with the meter.
The meter communicates with the modem at regular intervals, about every 2 minutes, executing a
sequence of commands designed to guarantee communication - switching the modem to command
mode [+++], resetting the settings [ATZ] and finally setting the speed between the modem and the
meter to the speed of the meter. The speed depends on the type of modem and the telephone link, but
the bit rate is usually 57600 baud.
To Next Page
Loading...
