Siemens RUGGEDCOM RMC20 User Manual

Installing the Device
2.4.2Serial Standard Conversion
1 2
2 3
1
RS232 Device
2
RUGGEDCOM RMC20
3
RS485 Device/Network
Figure2.5 Serial-to-Fiber Point-to-Point Topology
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.
2.4.2 Serial Standard Conversion
The following illustrates the connections for conversion between RS232 and
RS485/422 devices.
RUGGEDCOM RMC20
Installation Manual, 04/2021, C79000-G8976-1007-10
11

Siemens RUGGEDCOM RMC20 Specifications

General

Brand	Siemens
Model	RUGGEDCOM RMC20
Category	Media Converter
Language	English