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Serial Cable » History » Revision 4

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Anonymous, 02/19/2016 10:48 PM


The Calypso phones typically all have a RS232 port @ 3.3V levels on the 2.5mm earphone jack.

Those cables are sometimes called ''T191 unlock cable''.

You can either buy ready-made cables, e.g. at:

Or you can build it yourself (detailed instructions can be found on the net, search for "t191 unlock cable" or the like).

  • TxD is at the tip of the plug (PC to Device)
  • RxD is at the middle contact (Device to PC)
  • GND is the outer contact
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Updated by about 8 years ago · 4 revisions

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