STwrench User Guide System overview
9836 4134 01 Edition 2.9 45 (326)
To install the barcode reader module in the wrench, turn off the wrench, remove the cover and insert the
module (tighten the two screws).
After having installed the module in the unit you can add the identifiers reading to your tightening
programs. See the chapter Identifier for more information.
2.4.6 IRC
The Industrial Radio Communication (IRC) technology operates on the free 2.4 and 5 GHz ISM band.
For the STwrench, three different versions for the different IRC standards are available:
• IRC-B
• IRC-Z
• IRC-W
The table below gives an overview of the different standards:
Technique Latency
Multipath
Immunity
Interference
Immunity
IRC-B
High High High
IRC-Z
Poor Moderate Poor
IRC-W
Moderate Moderate Moderate
The performance of IRC-W is highly dependent on the infrastructure at the site.
Latency defines the delay times of the communication link i.e. when transferring tightening results. The
Multipath Immunity indicates how well the signal reflections in the environment are handled, for example
against walls or equipments. The Interference Immunity indicates how well other radio sources are
avoided.
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