Siemens RUGGEDCOM RMC20, Руководство по установке

Страница: 22 / 42

Installing the Device
2.4.3 Serial-to-Fiber Conversion: Loop Topology
3
4
2
2 2
1 1
1
RS485 Slave (Repeat = ON)
2
RUGGEDCOM RMC20
3
Multiple RUGGEDCOM RMC20 Devices
4
RS485 Master (Repeat = OFF)
Figure 2.7 Serial-to-Fiber Conversion in Example Optical Loop Topology
Position State Notes
1 OFF RS485/422 <-> Fiber
2 OFF Serial-to-Fiber Mode
3 OFF Half Duplex
4 OFF Fiber repeat: Refer to Figure 2.7, “Serial-to-Fiber
Conversion in Example Optical Loop Topology”
6 OFF
7 OFF
8 ON
9600 Baud
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
13