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F485 COMMUNICATIONS CONVERTER
CONNECTIONS
RS232
The RS232 connector on the F485 converter accepts a
standard 9-pin computer cable. See wiring diagram for pin
assignments.
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 from entering the connectors.
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.
SWITCH A (BAUD RATES)
BAUD
A1
A2
1200
ON
OFF
2400
OFF
ON
4800
OFF
OFF
9600
OFF
OFF
19200
OFF
OFF
38400
OFF
OFF
57600
OFF
OFF
SWITCH B (CONFIGURATION)
CONFIGURATION
RS232 TO RS485
RS232 TO FIBER
RS485 TO FIBER
g
Figure 3: Connections
Figure 4: Switch Locator
A3
A4
A5
A6
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
B1
B2
B3
B4
OFF
ON
OFF
ON
OFF
OFF
OFF
OFF
ON
OFF
ON
OFF
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.
POWER JACK
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.
POWER TERMINALS
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.
A7
SWITCH A (DTE/DCE)
OFF
MODE
OFF
DTE
OFF
DCE
OFF
OFF
OFF
ON
B5
B6
OFF
OFF
ON
ON
OFF
OFF
Page 4 of 8
805700A1.CDR
A8
OFF
ON
GE Multilin
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