Data Communications; Overview Of Ports; Handling Of Multiple Communication Hosts; Incom Network Information And Wiring - Eaton Cutler-Hammer FP 5000 Instruction Leaflet

10 DATA COMMUNICATIONS

10.1 Overview of Ports

The FP-5000 is designed to provide several communication options.
The major options are single-point RS-232 and 2-wire INCOM Local
Area Network (LAN). This section describes these two communication
ports and the two major software packages which make use of
these ports to interface with the FP-5000. One additional software
package, the FlashLoader, is treated in Section 12 Troubleshooting.
That program updates the firmware, an infrequent event which is
not part of the day-to-day operation of the FP-5000.

10.1.1 Handling of Multiple Communication Hosts

The FP-5000 is designed to handle simultaneous communications
with the front and rear communications channels. Monitoring functions
can occur in parallel, however service routines like setpoint download or
control functions will be handled on a "first come – first serve" basis.
Whichever port starts first will lock the other port out until finished.

10.1.2 INCOM Network Information and Wiring

The following simplified rules apply given a system consisting of a
single daisy chained main cable link between master and slave
devices. For more complex considerations, including star configura-
tions or systems containing old and new INCOM slave devices,
please refer to the IMPACC Wiring Specification 17513 available on
the Cutler-Hammer web site.
Figure 10-1. INCOM Network Connection

10.1.3 Front RS-232 Port Connection

The Front Panel RS-232 port provides the user convenient PC
or lap-top access to the data and update features of the FP-5000. The
user may access all the data measured and calculated, program and
retrieve settings, invoke or monitor logging or data capture activity, and
update firmware through the Front Panel RS-232 port.
The FP-5000 places its transmit onto pin 2 and its receive onto pin 3,
making it a Data Set or Data Communication Equipment (DSE or DCE)
interface under the definitions of the RS-232 standard. PCs are
generally defaulted to Data Terminal (DTE), which allows them to
connect directly to a Data Set with straight-through wiring. Note that the
FP-5000 communicates through a 9-pin D-Subminiature Connector,
Effective Date: 12/05
FP-5000
For more information visit:
Effective Date: 12/05
• The maximum system capacity is 10,000 feet of communications
cable and 1000 slave devices.
• The main cable link must be terminated at each end by a ½ W,
100 ohm carbon resistor.
• Non-terminated taps, up to 200 feet in length, off the main link are
permitted, but add to the total cable length.
• Terminals 1 and 2 of the INCOM J1 or J2 terminal plugs are for the
twisted pair conductors, terminal 3 is for the shield. The polarity of
the twisted pair is not important. Note: It is highly recommended
that ferrules be used to dress the ends of the cable leads to
minimize frayed connections and add stress release.
• Always follow the National Electrical and local codes
for cable routing.
• When leaving a building, lightening surge protection is required.
Phoenix Contact Plugtrab is recommended. This two-piece design
absorbs 0.5 db of signal strength (reduces cable length maximum
by ~ 250ft. per protector.):
- Base UFBK-BE #27 83 09 5
- Plug UFBK-M-2-PE-24DC-ST #28 17 05 5
• The twisted pair cable must be one of the following:
- CH IMPCABLE – 600 V AWM, 300 V CM, 90C
(attenuation 1.6 db/1 K')
- Belden 3072F – 600 V TC, 75C (attenuation 2.0 db/1 K')
- Belden 9463 family (many variations are available) or equivalent
INCOM
whereas a PC RS-232 connector may be either a 9-pin or a 25-pin
D-Subminiature Connector. The "straight-through" wiring for a 9-pin
to 9-pin cable is not the case for a 9-pin to 25-pin cable. (See
Figure 10-2.) The wire names are related to the Data Terminal end,
thus RS-232 output of the FP-5000 is connected to the Receive
line, and its RS-232 input is connected to the Transmit line.
The FP-5000 uses none of the RS-232 hardware control lines.
Although the FP-5000 operates with the "3-wire" connection shown in
Figure 10-2, a standard off-the-shelf serial cable will allow communica-
tion. An example of an easily available and acceptable cable is the
RadioShack ® , 26-117B, Male DB9 to Female DB9 Shield RS-232C
Cable. This cable connects 1-1, 2-2, ..., 9-9. That is, the cable is
connected "straight-through."
www.eatonelectrical.com
IL17569B
Page 10-1
Page 10-1