11
Electrical Connection
Bus cable, cable length and size
Note that screened multi-core twisted-pair control cable is required, e. g. UNITRONIC
®
BUS CAN 2 x 2 x ... mm
2
or RE-2YCYV-fl 2 x 2 x ... mm
2
.
Control cable assemblies (cable with plug and connector) of various lengths are available as add-on
equipment.
The cable length dictates the baud rate (data transfer rate) between the bus nodes, and the total power
consumption of the sensor dictates the conductor size.
The baud rate is set via code switch
D
Fig. 4
(S 8 to 10). Default factory setting of control unit
TRS 5-40: baud rate 250 kbit/s (cable length up to 125m). For longer cable lengths reduce baud rate
accordingly. Make sure that all bus nodes feature the same settings.
S 8
S 9
S 10
Baud rate
Cable length
Number of pairs
and conductor size [mm
2
]
OFF
ON
OFF
250 kBit/s
125 m
2 x 2 x 0.34
Factory setting
ON
ON
OFF
125 kBit/s
250 m
2 x 2 x 0.5
OFF
OFF
ON
100 kBit/s
335 m
2 x 2 x 0.75
ON
OFF
ON
50 kBit/s
500 m
on request, depending on
bus configuration
OFF
ON
ON
20 kBit/s
1000 m
ON
ON
ON
10 kBit/s
1000 m
Note
The max. baud rates and cable lengths indicated above are based on empirical values
obtained by GESTRA. In certain cases it may be necessary to reduce the baud rate in
order to ensure troublefree operation.
Changing baud rate
To set the baud rate detach the lower terminal strip. The terminal strip can be detached after undoing
the right and the left fixing screws.
Use a small screwdriver to set the baud rate via the switches S 8 to S 10 of the code switch
D
Fig. 4.
Then re-attach the terminal strip and fasten the fixing screws.
Wiring terminal strip
Wire the terminal strips according to the wiring diagram. Connect the screen only to terminal 3.
