iSC2F User’s Manual
UM-iSC2F-2-EN.docx
Pages 3 of 12
Serial-to-Fiber Conversion—Point-to-Point
1.
RS232 device
2.
iSC2F
3.
RS485 Device/ Network
Note that the distance between the two ISC2F devices should be less than 5 km (3.1 mi).
RS232 Device
Position
State
Notes
1
ON
RS232 to fiber
2
OFF
RS232-to-RS485/422 conversion
3
ON/OFF
Full-duplex (485-4W or 485-2W)
4
OFF
No 120
Ω
termination
5
OFF
Fiber repeater
Note: Position 3 applies to RS485 only.
RS422/RS485 Device
Position
State
Notes
1
OFF
RS232 to fiber
2
OFF
RS232-to-RS485/422 conversion
3
ON
Full-duplex
4
OFF
No 120
Ω
termination
5
OFF
Fiber repeater
In this mode, serial data is converted directly into light signal and transmitted over multi-
mode fiber optics. The serial standard is selected by Position 1 of the DIP switches: OFF
(default) is for RS485/RS422, and ON is for RS232. Position 2 should be OFF for serial to fiber
conversion. Position 6-10 should be configured if RS485 communications are used, to have
the appropriate turn-around timer shown below selected. Positions 6-10 do not impact
communications in full-duplex mode.
