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F485 COMMUNICATIONS CONVERTER Page 4 of 8
g
GE Multilin
CONNECTIONS
805700A1.CDR
RS232
COMPUTER
FIBER OPTIC
RS485
POWER
POWER
9V
AC/DC
Tx
Rx
COM
RS232
FIBER
POWER JACK
The RS232 connector on the F485 converter accepts a
standard 9-pincomputer cable. Seewiring diagram forpin
assignments.
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
preventdustfromenteringtheconnectors.
Connect the supplied power
adaptertothisinputifpowerisnot
supplied via the terminals. The
power adapter steps down
120/220VACto9VAC.
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
externalterminating network isrequired. Observecorrect
polarity.
POWER TERMINALS
Thepowerterminalsaccepteither9VACor9VDCtopower
theF485converterinsteadofusingthepoweradapter.The
GND terminal must be connected to ground to ensure
adaquate protection against transients. Pin 4 is the main
transientgroundfortheconverter.
GND
1
2
3
4
5
6
+
-
+
-
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
SWITCH A (DTE/DCE)
MODE A8
DTE OFF
DCE ON