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1MRS 750109-MUM
2.
2.1.
ABB Automation
Router Option Card for Lon® Star Coupler
RER 111
Functions
The router option card has one 9-pin D-type connector for the twisted pair interface
and one fibre-optic transceiver pair. There are two transceiver modules available for
the twisted pair interface, either of which may be connected to the router core
module RTR-10 via jumpers.
To enable the use of two different media, the router option card is divided into two
sections, router side A and router side B. The open collector bus, connected to the
mother board of the RER 111 unit, is directly connected to router side B. This
connection cannot be changed. The communication speed in router side B must be
1.25 Mb/s. Router side A may be connected to either the fibre-optic transceiver or
the transformer-isolated twisted pair transceiver with a communication speed of 78
kb/s or 1.25 Mb/s. When the fibre-optic transceiver is connected to router side A, the
communication speed must be 1.25 Mb/s.
The router option card also contains a service switch. When this switch is pressed
and released, the router generates a service pin message to both router sides. This
service pin message is used by the network management device (e.g. higher level
processors, PC, etc.) to install and configure the router option card. The two sides of
the router option card must be configured separately.
The router option card also contains two service LEDs, one for each side of the
router option card. These LEDs are blinking when the corresponding router side is
unconfigured. After configuration of the router side, the LED is off.
Please note that for router side A, only one type of interfacing, that is, either the
twisted pair interface or the fibre-optic interface, can be attached at the same time.
The RTR-10 core module also incorporates two simple collision detection circuits,
one for each router side. Each circuit detects a collision if the transmitted data is in
the '1' state whilst the received data is in the '0' state. The circuit is permanently
active on router side B. On router side A, the circuit is active only when the fibre-
optic interface is used.
The router option card has a self-supervision feature for continuous light reception.
If the fibre-optic channel receives continuous light, the reception on the channel is
cut off. The error is notified to the I/O module of RER 111 LON Star Coupler via
the error line. Error reset is also notified. For information regarding the error line of
the RER 111 Star Coupler, refer to the RER 111 manual 1MRS750104-MUM,
chapter 4.1.
The indication LED of the fibre-optic receiver is continuously lit if continuous light
is received.
Twisted pair interface
The twisted pair interface is transformer-isolated and has a communication speed of
either 78 kb/s or 1.25 Mb/s. Jumpers are used to select the interface to be used.
Physically, the interface is a 9-pin D-type female connector.
The twisted pair interface can only be attached to router side A.
SROUT
7
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