When an AKA 245 receives a datagram that has to be re-transmitted to an AKC controller, for example,
the gateway checks its router table to see where this AKC is placed. It is either placed in the same
network as the gateway, or it is placed in another network. In the former case, the gateway can send
the datagram directly to the fi nal receiver. In the latter case, the gateway must send the datagram to
another AKA 245 which will then re-transmit the datagram.
The access key to the router table is the system address (Network : Address) of the receiver of the
datagram.
Example 1.
A system consists of a PC on network 1, and two AKC controllers on network 2.
The AKC’s are addressed with 2:1 and 2:2, respectively.
The PC is addressed with 1:1.
AKA 245 is addressed with 2:125 (and this makes it the DANBUSS Master).
The PC wants to send a message to the AKC with system address 2:1.
The datagram is fi rst sent to AKA 245 who checks its router table to see where the datagram has to be
routed.
As the controller is on the same network as the master gateway, it will transmit directly to the control-
ler (a router line will not be required).
The router lines shown are needed to allow messages to be sent from the AKC controllers to the PC.
Example 2.
A system consists of a PC in network No. 1, a PC gateway, two AKC controllers and a modem gateway
in network No. 2.
Network 5 consists of one more modem gateway as well as two AKC controllers.
The AKC controllers are addressed with 2:1, 2:2, 5:1 and 5:2, respectively.
The PC gateway is addressed with 2:120.
The two modem gateways are addressed with 2:125 and 5:125. So in both networks it is the modem
gateway which is the Master.
The PC is addressed with 1:1.
Appendix A - continued
Function
AKA 245
AKA
245
Manual RS8DT102 © Danfoss 09/2004
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