Network Termination; System Specifications - GE AF-600 FP Operating Instructions Manual

4.1.3 Network Termination

Dependent on the type of topology, at least one of the connected nodes must be terminated (52.5Ω). The option has two built-in termination circuits which are
activated by the terminator switches S300 and S301.
If termination is provided elsewhere in the network, the termination switches should be OFF. If a double-terminated bus topology is used, the first and the last
node should be double-terminated (105Ω).
Termination switch positions are shown in the table below.
Termination type
No termination (factory setting)
Double termination (105 Ω)
Single termination (52.5 Ω)
4.1.4 Connecting the Bus Line
Connect bus wire NET A to terminal 79 and NET B to 80 of the terminal connector.
Terminal
NB!
*Note: For free topology wiring the option is insensitive to the polarity of the bus-terminals.
NB!
**Note: Term. 61 (Drain) offers a RC-junction to ground and should not be used for grounding of shielded cable. Ground the shielded cable at the de-coupling
plate by removing cable insulation at contact point.
4.1.5 Maximum Cable Lengths
Network topology
Free topology without repeater
Free topology with one repeater
Free topology maximum device-to-device
Bus topology single terminated
Bus topology double terminated without repeater
Bus topology double terminated with one repeater
Bus topology maximum stub length
Use of the same cable type throughout the entire network is recommended in order to avoid impedance mismatch.

4.1.6 System Specifications

Up to 64 FT-X1/FTT-10 transceivers, are allowed per network segment.
NB!
Note: The Free Topology LonWorks runs at 78 Kbps only.
79
80
61
S 300 S 301
OFF
ON
ON
Connection
NET A*
NET B*
Drain**
Maximum cable length
500 m
1000 m
500 m
500 m
2700 m
5400 m
3 m
AF-600 FP LonWorks
OFF
4
OFF
ON
9