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other objects that impede radio waves can significantly reduce the reliable communication
distance. Another factor affecting the reliability and distance combination is the radio
environment in which the unit will be used.
The controller and torque wrench may operate on any of the 12 channels these products
use. It is generally best to think about this even before the unit is installed.
The radio modules in the controllers and torque wrenches used with them comply with the
IEEE 802.15.4 standard. The channel numbers loosely match the channels used by the
IEEE 802.11b/g WLAN standard. It may be beneficial to use channels that do not match the
channels used by a nearby wireless network. The graph below depicts both standards and
illustrates the center frequencies and channel overlap for each standard.
Notice that the channels we use leave a much smaller footprint than WLAN. Also notice
that one WLAN channel radiates energy onto several of the adjacent WLAN and process
monitor (PM) channels.
For
the
most
reliable
between the Bahco PM and the tool in a
802.11b/g LAN environment, it is usually
best to choose a channel for the controller
and tool that is separated from the channel
of the LAN.
Unlike IEEE 802.15.1 (Bluetooth) radios,
our 2.4GHz radio modules do not frequency
hop, use less power and have faster
response times with less impact on other
wireless devices. A wrench only transmits
a small packet of data after each torque
operation, and each transmission lasts
about 30ms (0.03 seconds).
The 2.4GHz radio used by the unit and the
tool is certified in the United States (FCC),
Canada (IC), and Europe (CE).
Torque wrenchoutputpower:
Controller 2.4GHz output power: 10-60mw
Typical 802.11b/goutput power: 100mw
communication
1mw
Frequency Map of 802.15.4 vs. 802.11b/g
Center Frequency (GHz)
Channel
802.15.4
1
2.410
2
2.415
3
2.420
4
2.425
5
2.430
6
2.435
7
2.440
8
2.445
9
2.450
10
2.455
11
2.460
12
2.465
802.11b/g
2.412
2.417
2.422
2.427
2.432
2.437
2.442
2.447
2.452
2.457
2.462
7
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