COMMUNICATIONS CONVERTER
Instruction Manual
F485
Manual P/N: 1601-0073-A3
Copyright © 2003 GE Multilin
805701A1.CDR
IND.CONT. EQ.
E83849
LISTED
52TL
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GE Multilin
215 Anderson Avenue, Markham, Ontario L6E 1B3
Tel: (905) 294-6222 Fax: (905) 201-2098
Toll Free: 1-800-547-8629 (North America)
Web Site: www.GEindustrial.com/multilin
F485 COMMUNICATIONS CONVERTER Page 3 of 8
805701A1.CDR
FEATURES
• Converts between RS232, RS485 or Fiber
• 1200 to 57600 baud rates
• Isolated RS485 interface
• 50/125µm, 62.5/125µm, and 100/140µm fiber
sizes
• Front panel LEDs for power, RS232 Rx/Tx,
and RS485 Rx/Tx
• Two possible mounting arrangements
• 120 V AC (ANOMA AEC-3590 or other listed
direct plug-in Class 2 power supply rated
maximum 9 V DC output) or 220 V AC adapter
included.
• Additional power supply terminals supplied to
accept isolated 9 V AC / 9 V DC
• Two interface cables provided
(9pin – 9pin, 9pin – 25pin)
• Suitable for use with direct or modem
communications.
• E83849 UL Listed for the USA and Canada
DESCRIPTION
The F485 is a self-contained device for converting between RS232, RS485, and fiber optic signals. The
converter uses internal switches to select the conversion type (RS232 to RS485, RS232 to FIBER, or
RS485 to FIBER) and the RS485 communications baud rates up to 57600 baud. The F485 converter
uses the data on the serial port to determine direction and therefore requires no hardware handshaking
signals from the computer. The F485 converter can be powered via the power adapter supplied or by
connecting an external isolated 9 V AC/DC source to the power supply terminals located at the back of
the case. The F485’s versatility and simple design makes it ideal for use with all GE Multilin products in
direct and modem communications.
TYPICAL CONFIGURATIONS
Figure 1: RS232 to RS485 connection
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Figure 2: RS232 to FIBER and FIBER to RS485
GE Multilin
F485 COMMUNICATIONS CONVERTER Page 4 of 8
CONNECTIONS
RS232
The RS232 connector on the F485 converter accepts a
standard 9-pin computer cable. See wiring diagram for pin
assignments.
RS485
The RS485 terminals accept a standard shielded twisted
pair (such as Beldon 9841) and provide connections for a
"+", "-" and a shield. The RS485 terminals have a
terminating network installed internally and therefore, no
external terminating network is required. Observe correct
polarity.
RS232
COMPUTER
FIBER
The fiber input/output will accept 50/125, 62.5/125 and
100/140um fiber sizes using ST terminated cables. Care
should be taken when removing the protective caps to
prevent dust fromentering the connectors.
FIBER OPTIC
Tx
RS485
Rx
1
+
POWER
3
4
2
-
COM
GND
POWER
5
6
9V
-
+
AC/DC
POWER TERMINALS
The powerterminals accept either 9 VAC or9 VDC to power
the F485converter instead ofusing the power adapter.The
GND terminal must be connected to ground to ensure
adaquate protection against transients. Pin 4 is the main
transient ground forthe converter.
POWER JACK
Connect the supplied power
adapter tothis input ifpower is not
supplied via the terminals. The
power adapter steps down
120/220 VACto 9 VAC.
805700A1.CDR
Figure 3: Connections
CONFIGURATION
The converter box is configured via two internal dip switch banks which are accessible by removing the
converter box cover. Switches A1-A8 are used to set the baud rate for RS485 communications and
determine whether the converter is DTE (RS232 direct) or DCE (RS232 modem). Switches B1-B6 are
used to select the interface type. The designator for each switch is clearly marked on the printed circuit
board. The tables shown below provide a description of each switch within the switch banks.
Figure 4: Switch Locator
SWITCH A (BAUD RATES)
BAUD A1 A2 A3 A4 A5 A6 A7
1200 ON OFF OFF OFF OFF OFF OFF
2400 OFF ON OFF OFF OFF OFF OFF
4800 OFF OFF ON OFF OFF OFF OFF
9600 OFF OFF OFF ON OFF OFF OFF
19200 OFF OFF OFF OFF ON OFF OFF
38400 OFF OFF OFF OFF OFF ON OFF
57600 OFF OFF OFF OFF OFF OFF ON
SWITCH B (CONFIGURATION)
CONFIGURATION B1 B2 B3 B4 B5 B6
RS232 TO RS485 OFF ON OFF ON OFF OFF
RS232 TO FIBER OFF OFF OFF OFF ON ON
RS485 TO FIBER ON OFF ON OFF OFF OFF
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SWITCH A (DTE/DCE)
MODE A8
DTE OFF
DCE ON
GE Multilin
F485 COMMUNICATIONS CONVERTER Page 5 of 8
BAUD RATES
Two-wire RS485 is half duplex and requires a means for switching between a receive or transmit state.
The F485 converter uses the incoming data to control the direction and therefore requires no control
signals from the master device (RS232 or fiber) to switch from transmit to receive mode after the last
character has been transmitted. The baud rate switches control the length of time that the RS485
transmitter will remain in the transmit direction after the last character has been transmitted. The length of
time is fixed at 3.5 character times at the selected baud rate making it suitable for use with Modbus
protocol. When converting RS232 to FIBER, these switches (A1-7) have no effect.
DTE/DCE CONTROL
The DTE/DCE setting reverses the transmit/receive data lines on the RS232 side. For communications
between a computer and a slave device, DTE (direct) should be selected. When connecting the F485
converter to a modem or other data communications equipment, DCE should be selected. Another
application which requires DCE is when two F485 converters are connected back-to-back i.e. converting
RS232 to RS485 or fiber and then converting the RS485 or fiber back to RS232. In this case, the second
F485 must be set to DCE control.
NOTE: Selecting switch settings other than those shown above will cause unpredictable results.
®
RTU
FIBER OPTIC TRANSMITTER/RECEIVER (optional)
Fiber optic transmissions provide an ideal solution for areas where RS485 communications via a twisted
pair have traditionally caused problems. Fiber is immune to electrical interference and provides total
isolation.
The fiber optic transmitter and receiver used in the F485 converter utilize 820nm wavelength technology
and are designed to operate with 50/125µm, 62.5/125µm and 100/140µm fiber sizes using ST terminated
cables. The ST connections provide repeatable connections within 0.2 dB typically. The
transmitter/receiver pair will typically work with fiber lengths up to 1km.
WARNING: Ensure the dust covers are installed when the fiber is not in use. Dirty or
scratched connectors can lead to high losses on a fiber link.
WARNING: Observing the transmitter output under magnification may cause injury to
the eye.
INSTALLATION
Two different mounting arrangements are possible. The first is by using the two mounting holes inside the
plastic case along with the mounting screws supplied. To remove the plastic top, simply press in the two
plastic tabs on either end of the box and then pull off the top. The second and less permanent method is
to use the Velcro material supplied for attachment to the side of a computer or desk. Where possible,
ensure that the LEDs on the front panel are visible. The LEDs are a very valuable tool when
troubleshooting a problem.
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GE Multilin
F485 COMMUNICATIONS CONVERTER Page 6 of 8
WIRING DIAGRAM
BAUD RATE
SWITCHES
TIMER
GE MULTILIN
F485 CONVERTER
VOLTAGE
+
5
INPUT
-
6
9VAC/9VDC
POWER
JACK
9VAC
DIRECTION
DATA
CONFIGURATION
SWITCH
POWER SUPPLY
~
9VAC/
9VDC
+
9VDC
~
120/220 VAC
ISOLATED
RS485
CONVERTER
DATA
5V
-
POWER ADAPTER
RS232
DRIVER
POWER
RS232
LED Rx
RS232
LED Tx
+5V
TERMINATION
AND LINE BIAS
RS485
LED Rx
RS485
LED Tx
DATA
+5V
DTE/DCE
RELAY
DTE/DCE
SWITCH
Tx
FIBER
Rx
+
-
RS485
SHIELD
GND
1
2
3
4
ST
CONNECTOR
`
50/125 um fiber
`
62.5/125 um fiber
`
100/140 um fiber
RS232 INTERFACE
F485 COMPUTER
TXD TXD
RXD RXD
SGND SGND
CONNECTOR
RS232
TO RELAYS
SR489STATUS GENERATORSTATUS
OUTPUTRELAYS
SR489INSERVICE BREAKEROPEN R1TRIP
R2AUXILIARY
SETPOINTACCESS BREAKERCLOSED
R3AUXILIARY
COMPUTERRS232 HOTSTATOR
R4AUXILIARY
NEG.SEQUENCE
COMPUTERRS485
R5ALARM
GROUND
AUXILIARYRS485
R6SERVICE
LOSSOFFIELD
ALT.SETPOINTS
RESET
VTFAILURE
RESET
POSSIBLE
MESSAGE
BREAKERFAILURE
NEXT
PROGRAMPORT
SETPOINT
7
89
MESSAGE
ACTUAL
456
ESCAPE
123
VALUE
.
HELP
ENTER
0
TM
489Generator Management Relay
e
1 18
2 23
3 32
4 420
5 57
6 66
7 74
8 85
9 920
9 PIN
25 PIN
CONNECTOR
COMPUTER
805752A9.CDR
ORDER CODE
DIMENSIONS
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GE Multilin
F485 COMMUNICATIONS CONVERTER Page 7 of 8
GE Multilin Relay Warranty
General Electric Multilin Inc. (GE Multilin) warrants each relay
it manufactures to be free from defects in material and
workmanship under normal use and service for a period of 24
months from date of shipment from factory.
In the event of a failure covered by warranty, GE Multilin will
undertake to repair or replace the relay providing the
warrantor determined that it is defective and it is returned with
all transportation charges prepaid to an authorized service
center or the factory. Repairs or replacement under warranty
will be made without charge.
Warranty shall not apply to any relay which has been subject
to misuse, negligence, accident, incorrect installation or use
not in accordance with instructions nor any unit that has been
altered outside a GE Multilin authorized factory outlet.
GE Multilin is not liable for special, indirect or consequential
damages or for loss of profit or for expenses sustained as a
result of a relay malfunction, incorrect application or
adjustment.
For complete text of Warranty (including limitations and
disclaimers) refer to GE Multilin Standard Conditions of Sale.
g
GE Multilin
g
GE
215 Anderson Avenue
Markham, Ontario
Canada L6E 1B3
Tel: (905) 294-6222
Fax: (905) 201-2098
http://www.GEindustrial.com/pm
Multilin
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