SmartSensor 105 User Guide – Wavetronix LLC
9/20/07
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35
Appendix G – Cable Lengths
The following recommendations allow the user to provide reliable power to the
SmartSensor. The SmartSensor cable’s red and black wires provide a 20 AWG wire pair.
The other pairs on the SmartSensor cable are 22 AWG and are normally used for
communication.
Gauge
Pairs
24 V
12 V
20 AWG
1-Pair
600 ft
110 ft
Additional 22 AWG
Each Pair
Add 400 ft
Add 75 ft
22 AWG
1st Pair
400 ft
75 ft
Additional 22 AWG
Each Pair
Add 400 ft
Add 75 ft
14 AWG
1-Pair
2500 ft
450 ft
12 AWG
1-Pair
3900 ft
700 ft
10 AWG
1-Pair
6000 ft
1050 ft
8 AWG
1-Pair
9900 ft
1750 ft
6 AWG
1-Pair
14,000 ft
2500 ft
Alternate Power Cables
Power
Cable
SmartSensor Cable
Old SmartSensor Cable
Table 8 - Maximum Cable Length for Power (ft)
If the cable length is longer than 600 feet when operating at 24 V, it is possible to
increase the maximum cable length by wiring a pair of lines normally used for RS-232
communications with the red and black wires.
If the cable length is 200 feet or greater you cannot reliably use RS-232 communications.
To add 400 feet and achieve a maximum cable length of 1000 feet, connect the orange
wire (normally RTS) to the red wire and the brown wire (normally CTS) to the black
wire.
If your cable run is longer than 1000 feet, it is possible to sacrifice additional
communication pairs to increase the maximum cable length for power. However, you
may desire to communicate to the sensor over two independent channels, in which case
you will need to consider an alternate cable for power. The AWG for wire pairs that
achieve a 2000 ft maximum cable length or greater at 12 and 24 V are listed in Table 8.
To achieve reliable wired communications, the selected baud rate must be compatible
with the length of the cable run. The table below shows the cable length
recommendations for wired communications (see Table 9):
115.2
57.6
38.4
19.2
9.6
RS-485
300 ft
600 ft
800 ft
1000 ft
2000 ft
RS-232
40 ft
60 ft
100 ft
140 ft
200 ft
Baud Rate (Kbps)
Table 9 - Maximum Cable Length for Wired Communications (ft)
To provide two independent communication channels with a homerun cable length over
200 ft, convert the RS-232 data into RS-485 using a Click! 304 in a pole-mount cabinet
Summary of Contents for SMARTSENSOR 105
Page 7: ...SmartSensor 105 User Guide Wavetronix LLC 9 20 07 7 Table 1 Mounting Height Guidelines...
Page 12: ...SmartSensor 105 User Guide Wavetronix LLC 9 20 07 12 Figure 6 Long Distance Cable Run...
Page 34: ...SmartSensor 105 User Guide Wavetronix LLC 9 20 07 34 Table 7 Belden 9331 Old Cable Conversions...
