Siemens RUGGEDCOM RMC20 Installation Manual page 22

1
2
3
4
Figure 2.7
The repeat function will optically re-transmit any data received on the optical
receiver, in addition to any connected serial devices. As a result, any data transmitted
from the master, will be re-transmitted optically to all the slaves. This mode of
operation requires that the master device tolerate receiving echoes of transmitted
data since any transmissions will be received once again via the optical ring.
This topology can be used for RS232, RS485 or RS422 multi-drop networks. In all
cases, all slaves have the repeat function (DIP position 4) ON, while the master is
configured with the repeat function OFF. This topology can allow for the mixture
of RS232, RS485 and RS422 devices, operating on the same baud rate, on a single
RUGGEDCOM RMC20
Installation Manual, 04/2021, C79000-G8976-1007-10
2
1
RS485 Slave (Repeat = ON)
RUGGEDCOM RMC20
Multiple RUGGEDCOM RMC20 Devices
RS485 Master (Repeat = OFF)
Serial-to-Fiber Conversion in Example Optical Loop Topology
Position
1
2
3
4
6
7
8
2.4.3 Serial-to-Fiber Conversion: Loop Topology
2
3
State
OFF
OFF
OFF
OFF Fiber repeat: Refer to
Conversion in Example Optical Loop Topology"
OFF
OFF
ON
Installing the Device
2
1
Notes
RS485/422 <-> Fiber
Serial-to-Fiber Mode
Half Duplex
Figure 2.7, "Serial-to-Fiber
9600 Baud
4
13