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NOTE: Non-isolated RS-232 ports are susceptible to electrical noise. For that reason it is recommended
that connecting cables be no longer than 10 feet (3m) when connecting to a non-isolated port. Devices
connected to non-isolated ports must have the same ground return as the DPU1500R unit.
Refer to the Select Communication Options Table when making option selections.
In addition to the standard front or rear non-isolated RS-232 port (COM 1), the following rear communication port
options are available:
Option 0
This option provides RS-232 communication via the non-isolated COM 2 port and is suitable only in applications
where communication to the unit is local through a direct connection to a PC or remote through an external isolating
communication device , such as an RS-232 to fiber optic converter, which is connected to the relay using a short cable.
Options 1 through 5 are provided on an independent communication card installed in the unit.
Option 1
This option provides RS-232 communication via the isolated COM 3 port for transient immunity and isolation and must
be used where communication cable lengths are greater than 10 feet (3m) or a common ground is not guaranteed. In
general, RS-232 communication is limited to a maximum distance of 50 feet (15m). Aux Com and COM 2 ports are
disabled in this configuration.
Option 2
This option provides RS-232 communication via isolated COM 3 port and RS-485 communication via the isolated Aux
Com port. The auxiliary port is an isolated RS-485 configuration that supports several communication protocols ( See
Communication Protocol Category On Ordering Sheet ). COM 2 ports are disabled in this configuration.
Option 3
This option provides INCOM
INCOM
™
, or ABB WRELCOM™, network is used. COM 2 and COM 3 ports are disabled in this configuration.
Option 4
This option provides RS-485 communication, via the isolated Aux Com port and INCOM
port. In this configuration, the INCOM
in this configuration.
Option 5
This option provides RS-485 communication via the isolated Aux Com port, and is highly recommended for applications
requiring communication over distances of up to 300 feet (100m). This option has an advantage over RS-232 by
allowing networking of multiple relays via a simple 3 wire connection. COM 2 and COM 3 ports are disabled in this
configuration.
An RS-485 to RS-232 converter can be used to connect the network to an external device such as a modem or a
personal computer. Such converters are readily available in the marketplace for computer networking supplies.
Ordering Information/Communications/Panel Mounting/Spare Parts
™
availability, via the INCOM port, in applications where either the Cutler-Hammer
™
port provides the same functionality as option 3. COM 2 ports are disabled
ABB Distribution Protection Unit 1500R
™
website:www.abb.com/papd
availability via the INCOM
12-7
™
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