Rockwell Automation 1400-SP PowerMonitor Software - Manual (Page 14)

Chapter 2
System Requirements
2–2
The Powermonitor Software can communicate to all Powermonitors in the
system either via the RS–232C electrical standard or via the RS–485
standard. The type of communication hardware required at each site is
dependant on which of these electrical standards is used by the
Powermonitors located at that site.
If there is only one Powermonitor installed at a site, then the optional port
can be set for either the RS–232C standard or the RS–485 standard. If more
than one Powermonitor is installed at a site, then the RS–485 electrical
standard must be used and all Powermonitors located at that site must have
their optional RS–232C/RS–485 port set for RS–485 communications.
!
ATTENTION: Special high level isolation is required between
units when the possibility of high ground potential differences
exist. This may occur when separate grounds are used, or when
communicating to a unit off of the power ground matt. Failure to
do so can lead to personal injury or death, property damage, or
economic loss.
To determine the setting of optional RS–232C/RS–485 port refer to
Publication 1400–5.0, ‘‘Catalog Number 1400–DCU Communications Card
Instructions Sheet.”
The Powermonitor Software supports Hayes compatible internal and external
modems at 300, 1200, 2400, 4800, 9600 and 19.2K baud. Before selecting a
particular baud rate, verify that all equipment used supports that particular
baud rate.
Installations using modems require individual RS–232C and telephone cables
at each modem location.
Configuration of external modems is described in Chapter 3, ‘‘Installation.”
Internal modems should be useable with their factory–configured settings. If
necessary, please contact Allen–Bradley.
Chapter 3, ‘‘Installation” contains detailed instructions regarding the
installation of telephone modem data links.
RS–232C vs RS–485
Communications
Connection To Remote Sites
Via Telephone Lines and
Modems