Chapter 2
Installing the Device
RUGGEDCOM RMC20
Installation Guide
12 Serial-to-Fiber Conversion: Point-to-Point
NOTE
In this example, the distance between the two RUGGEDCOM RMC20 devices is less than 5 km (3.1 mi).
Figure7:Serial-to-Fiber Point-to-Point Topology
1.RS232 Device 2. RUGGEDCOM RMC20 3.RS485 Device/Network
RS232 Device
Position State Notes
1 ON RS232 <-> Fiber
2 OFF Serial-to-Fiber Mode
3 ON Full Duplex
4 OFF Fiber repeat OFF
RS422 Device/Network
Position State Notes
1 OFF RS422 <-> Fiber
2 OFF Serial-to-Fiber Mode
3 ON Full Duplex
4 OFF Fiber repeat OFF
In this mode, serial data is converted directly into light impulses, 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 6-8 should be configured if RS485
communications are used, in order to have the appropriate turn-around timer shown below selected. Positions 6-8
do not impact communications in full-duplex mode.
NOTE
A baud rate lower than 1200 bps is not supported in half-duplex or RS485 mode.
Baud Rate (bps) DIP6 DIP7 DIP8 Turn-Around Time
a
1200-2400 OFF OFF OFF 9.5 ms
4800-14400 OFF OFF ON 2.3 ms
19200-57600 OFF ON OFF 0.58 ms
>57600 ON OFF OFF 0.10 ms
a
Turn-around time is the amount of time after the start bit was transmitted and before the transceiver changed back to receiver mode.
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