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2. Hardware components
14
Festo.P.BE-CMMP-CAM-SW-EN en 1105a
2.4.3
Connecting cable between master and slave
–
Plug: Sub-D, 9-pin
–
Cable: straight, not cross-over
–
Transmission takes place standard according to RS422.
Note
To avoid problems due to electromagnetic interference (EMC), the
individual wires should be twisted in pairs and screened. For
transmission rates over 200 kbit/s, the cables should be equipped
with a terminating resistor.
Also observe the relationship between transmission rate and
maximum cable length.
Pin 5 is optional for cam disc operation (X11 -> X10) and does not
have to be connected. This pin is only used to supply external
encoders.
2.4.4
Topology of the connections between master and slave(s)
A bus topology is recommended when connecting several slaves.