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Connect cable between TapNPass and slave

  • RS-485 is the most popular hardware protocol for Modbus, but it may be RS-232 (check with the documentation of your device).
  • The supplied cables comply with the DB9 connectors described in the modbus.org specification, but other connectors with other pinouts could also be used.

  • If your system does not comply with the supplied cables, you must build your own adapter. See the TapNPass Reference Manual for more details.

  • If you are not in a 'bus context' (multiple device chain), but with a single RTU device, it is better to set the embedded 120 ohm termination resistor.

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