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Application Examples
3.2 Operating Modes and Data Transfer
NOTE
i
i
The RS232 interface is disabled in the receive direction (RX) and in the transmit direction (TX) in compatibi-
lity mode.
For more information, see
External Master Redundancy in a Star Topology
Mode
External master redundancy in a
star topology
Master 1 = RS232
Master 2 = fiber-optic channel 2
Extended mode
NOTE
i
i
Only one master can be active at any time, that is, either RX RS232 or R2! Protocols communicate which
master is active, and which master is in standby mode.
The active master transmits data, the master in standby mode only "listens" to the bus. The collision mecha-
nism may be a method for determining the active/standby master.
For more information, see
External Master Redundancy in a Star Topology
Mode
External master redundancy in a
star topology
Master 1 = fiber-optic channel 1
Master 2 = fiber-optic channel 2
Extended mode
NOTE
i
i
The RS232 interface is an additional slave when the RS232 cable has been inserted and pin 7 and pin 8 on
the DIGSI cable have been shorted. Otherwise, the RS232 interface is disabled.
Only R1 or R2 can be active at any time. Protocols communicate which master is active, and which master is
in standby mode.
The active master transmits data, the master in standby mode only "listens" to the bus. The collision mecha-
nism may be a method for determining the active/standby master.
For more information, see
24
3.5 Ring
Topology.
Data Transfer
Receive Channels
RX RS232 (receive)
R2
R1, R3 to R5
FO1: R1 and T1 are additional slave channels
3.4 Star Topology with Master Redundancy (Extended
Data Transfer
Receive Channels
R1
R2
RX RS232 (receive), R3 to R5
3.4 Star Topology with Master Redundancy (Extended
Transmit Channels
→ T1 to T5
→ TX RS232 (transmit), T1, T3 to T5
→ TX RS232 (transmit), T2
Mode),
Figure
Transmit Channels
→ TX RS232 (transmit), T2 to T5
→ TX RS232 (transmit), T1, T3 to T5
→ T1, T2
Mode),
Figure
Accessories, Mini Star Coupler, Manual
C53000-G9050-C595-1, Edition 05.2020
3-2.
3-4.
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