F485
COMMUNICATIONS CONVERTER
Instruction Manual
Manual P/N: 1601-0073-A3
Copyright © 2003 GE Multilin
805701A1.CDR
E83849
LISTED
IND.CONT. EQ.
52TL
g
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)
F485 COMMUNICATIONS CONVERTER
Page 3 of 8
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.
805701A1.CDR
•
•
•
•
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
Figure 2: RS232 to FIBER and FIBER to RS485
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GE Multilin
F485 COMMUNICATIONS CONVERTER
Page 4 of 8
CONNECTIONS
RS485
The RS485 terminals accept a standard shielded twisted
RS232
The RS232 connector on the F485 converter accepts a
standard 9-pin computer cable. See wiring diagram for pin
assignments.
pair (such as Beldon 9841) and provide connections for a
shield. The RS485 terminals have
"+", "-" and
a
a
terminating network installed internally and therefore, no
external terminating network is required. Observe correct
polarity.
POWER JACK
RS232
FIBER OPTIC
RS485
POWER
POWER
Connect the supplied power
adapter to this input if power is not
supplied via the terminals. The
power adapter steps down
120/220 VAC to 9 VAC.
Tx
Rx
COMPUTER
1
+
2
-
3
4
5
+
6
-
9V
AC/DC
COM GND
FIBER
POWER TERMINALS
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 from entering the connectors.
The power terminals accept either 9 VAC or 9 VDC to power
the F485 converter instead of using the power adapter. The
GND terminal must be connected to ground to ensure
adaquate protection against transients. Pin 4 is the main
transient ground for the converter.
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
SWITCH A (DTE/DCE)
1200
2400
4800
9600
19200
38400
57600
ON
OFF
ON
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
ON
MODE
A8
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
DTE
OFF
OFF
OFF
OFF
OFF
DCE
OFF
OFF
OFF
SWITCH B (CONFIGURATION)
CONFIGURATION
RS232 TO RS485
RS232 TO FIBER
RS485 TO FIBER
B1
B2
ON
OFF
OFF
B3
B4
ON
OFF
OFF
B5
OFF
ON
B6
OFF
ON
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
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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® RTU
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.
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
ISOLATED
TERMINATION
AND LINE BIAS
RS485
CONVERTER
BAUD RATE
SWITCHES
DIRECTION
TIMER
DATA
+
1
2
3
4
TO RELAYS
-
SHIELD
GND
SR489 STATUS GENERATOR STATUS OUTPUT RELAYS
SR489 IN SERVICE
SETPOINT ACCESS
COMPUTER RS232
COMPUTER RS485
AUXILIARY RS485
BREAKER OPEN
R1 TRIP
BREAKER CLOSED
R2 AUXILIARY
R3 AUXILIARY
R4 AUXILIARY
R5 ALARM
HOT STATOR
NEG. SEQUENCE
GROUND
AL
T
.
SETPOINTS
LOSS OF FIELD
VT FAILURE
R6 SERVICE
RESET
POSSIBLE RESET
MESSAGE
NEXT
BREAKER FAILURE
PROGRAM PORT
SETPOINT
7
8
5
9
6
MESSAGE
ACTUAL
ESCAPE
ENTER
4
1
.
2
3
VALUE
HELP
0
GE MULTILIN
RS485
LED Rx
TM
489 Generator Management Relay
e
F485 CONVERTER
RS485
LED Tx
ST
CONFIGURATION
SWITCH
CONNECTOR
Tx
Rx
DATA
`
RS232
50/125 um fiber
`
LED Rx
62.5/125 um fiber
`
VOLTAGE
INPUT
9VAC/9VDC
+
-
5
6
100/140 um fiber
RS232
LED Tx
RS232 INTERFACE
F485
COMPUTER
DTE/DCE
RELAY
1
1
2
3
4
5
6
7
8
9
8
DATA
RS232
DRIVER
TXD
RXD
2
3
4
5
6
7
8
9
3
TXD
RXD
2
20
7
SGND
SGND
DTE/DCE
SWITCH
+5V
6
POWER SUPPLY
4
~
+
+5V
POWER
5V
9VAC/
9VDC
5
9VDC
-
20
POWER
JACK
~
9 PIN
CONNECTOR
25 PIN
CONNECTOR
COMPUTER
120/220 VAC
RS232
POWER ADAPTER
805752A9.CDR
ORDER CODE
DIMENSIONS
g
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 Multilin
215 Anderson Avenue
Markham, Ontario
Canada L6E 1B3
Tel: (905) 294-6222
Fax: (905) 201-2098
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