• 2WIRE
  • Intermediate
  • 5 min
  • Smartcard shell

Recipe · Intermediate · 2WIRE

How to read an SLE4442 smartcard

2WIRE mode has a dedicated SLE44XX smartcard shell for ATR probing, security checks and memory dumps.

SLE4442 smartcard inserted in a reader.
Probe first, then dump only after the card responds cleanly.

Wiring View

SLE44XX card BP CLK2WIRE CLKIO2WIRE IORST2WIRE RSTVCCsupplyGNDGND
Generated from the wiring summary: SLE44XX card to BP.
Step 1

Commands

smartcard opens the interactive shell. Choose Probe first, then Security check, then Dump if the card responds.

Result

What it means

A non-empty ATR and security response means the wiring, reset line and protocol family are plausible.

Troubleshooting

  • Confusing SLE44XX 2-wire cards with I2C EEPROMs.
  • Missing RST wiring.
  • Wrong supply voltage for the card.
  • Trying unlock/write/protect actions before making a read-only dump.

Next steps

  • Save the dump output before attempting writes.
  • Run Security check to record remaining PSC attempts.
  • Use sniff only when you have an existing reader transaction to observe.

SLE4442 read FAQ

What is safe to do first on an SLE4442 card?

Start with probe, security status and dump. These read-oriented steps document the card before any unlock, write, protect or erase action changes its state.

What does a SLE4442 dump contain?

A dump reads the card memory exposed by the SLE4442-style workflow. It is useful for documenting lab cards before any status, PSC or write-related experiment.

Can I write or unlock after reading?

Only on lab cards you are authorized to modify, and only after saving the readout. Incorrect PSC attempts and protection changes can be irreversible.

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