Serial Cable » History » Version 8
vogelchr, 02/19/2016 10:48 PM
Added non-standard baudrates remark.
1 | 1 | laforge | |
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2 | 5 | vogelchr | The Calypso phones typically all have a serial port @ 3.3V levels on the 2.5mm earphone jack. |
3 | 1 | laforge | |
4 | 3 | laforge | Those cables are sometimes called ''T191 unlock cable''. |
5 | 1 | laforge | |
6 | 3 | laforge | You can either buy ready-made cables, e.g. at: |
7 | 7 | tsaitgaist | * USB variant |
8 | * [https://www.akku-king.net/_py_Handyzubehoer-Datenkabel-USB-Motorola-USB-Datenkabel-fuer-Motorola-T191-C113-C113a-C114-C115-C115i-C116-C117-C118-C119-C121-C122-C123-C136-C139-C140-C155-C156/a-20104991/ akku-king.net] |
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9 | * [http://www.gsmliberty.net/shop/motorola-t191-dataunlock-cable-p-1252.html gsmliberty.net] |
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10 | * RS232 variant, you still need a separate standard USB/RS232 cable |
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11 | * [http://www.handy-style.de/index/cat190/2130 handy-style.de] |
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12 | * [http://www.cellcorner.com/xshp/unlock-phone-codes/motorola-t190-t191-t193-unlock-data-cable.html cellcorner.com] |
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13 | 3 | laforge | |
14 | Or you can build it yourself (detailed instructions can be found on the net, search for "t191 unlock cable" or the like). |
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16 | 4 | laforge | * TxD is at the tip of the plug (PC to Device) |
17 | * RxD is at the middle contact (Device to PC) |
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18 | 1 | laforge | * GND is the outer contact |
19 | 5 | vogelchr | |
20 | == Hints and Warnings == |
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22 | * If you don't use a 3.3V (low voltage TTL, LVCMOS) serial port you can fry your phone! (internally, it connects to the IO-pins of the baseband processor which run at 2.8V). '''Don't connect directly to your PCs serial port (running at +/- 12V!).''' |
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23 | * If your development system is virtualized (runs inside VMware, Virtualbox, Parallels...) the connections can be unreliable (the loader protocol is timing critical). |
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24 | 8 | vogelchr | |
25 | 5 | vogelchr | * Your safest bet is a USB cable with a FTDI- or Prolific chip (FTx232, PL2303) configured for operation at 3.3V connected to a machine running Linux natively. |
26 | 8 | vogelchr | |
27 | * If you want to communicate with the Calypso at baudrates higher than 115200 bps, you'll have to resort to non-standard baudrates. These are also supported best using a FTDI based USB adapter cable. |