SMB350 User’s Manual
Page 28
Q. For those with only a single meter, is there a driver or software available to
remotely read the meter?
A. DAE provides the Modbus protocol, but the user must provide for the software or
purchase DAE
’s EnergyLink400 auto-metering software.
Q. How to connect to a h
ost computer that doesn’t have an RS485
communication port?
A. If the host computer only has an Ethernet port, then use an RS485 to Ethernet
converter.
Q. There is no communication or the communication is unstable between the
SMB350 and the host computer.
A. (1) Make sure that the network does not form a tree or star topology and that there
are no loops.
(2) Check that the converter has its parameters set up properly.
(3) Make sure that the baud rate set for SMB350s and the host computer are the
same.
(4) Make sure that each of the SMB350 on the same bus has its own unique
device address.
(5) Make sure that the polarities for the RS485 wiring are correct for all the
SMB350. All positive terminals must be connected together, and all negative
terminals must be connected together.
(6) Make sure that the total length of any single RS485 bus segment is less than
1000 meters (3000 feet), a segment is defined to be one without any
intervening repeaters.
(6) Make sure that there are no more than 32 devices on a single RS485 bus
segment.
Q. What will happen if the polarities are reversed for each of the following:
auxiliary power, CT and communication?
A. (1)
The auxiliary power requires AC power which doesn’t have a polarity.
