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Smart Card Reader cable specification for Wiegand and RS-485 connections


The Smart Card Reader Installation Manual cable specification does not specifically state which connection type the specified cables are for.

Product Line

Security Expert


  • Security Expert Smart Card Readers
  • SX-RD-MB


The four multi-conductor cable specifications mentioned in the Smart Card Reader Installation Manual are the approved cables for Wiegand connections only. There is no mention of the RS-485 cable specification in this document.


Smart Card Reader Wiegand Cable

The cable specifications are:

  • 22 AWG alpha 5196 or 5198
  • 18 AWG alpha 5386 or 5388
  • Maximum cable distance of 150m (492ft)

Smart Card Reader RS-485 Cable

The cable specification for RS-485 connections (including when those connections are encrypted) is not in the Smart Card Reader Installation Manual but does show up in the SP-C Manual under the "Module Wiring" heading. These same cable specifications apply to Smart Card Reader RS-485 cables as well.

  • Belden 9842 or equivalent
  • 24 AWG twisted pair with characteristic impedance of 120ohm
  • Maximum total length of cable is max 900m (3000ft)
  • CAT5e / CAT6 are also supported for data transmission when using ground in the same cable (to a maximum length 100m (328ft))
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