Serial Cable » History » Version 12
tsaitgaist, 02/19/2016 10:48 PM
cable not available
| 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 | * [http://www.gsmliberty.net/shop/motorola-t191-dataunlock-cable-p-1252.html gsmliberty.net] |
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| 9 | 9 | laforge | * [http://www.fonefunshop.co.uk/datacables/motorola.htm fonefunshop.co.uk] |
| 10 | 7 | tsaitgaist | * RS232 variant, you still need a separate standard USB/RS232 cable |
| 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 | 10 | laforge | * USB/RS232 cable |
| 14 | * [http://www.tronisoft.com/cat_usbtoserial.php tronisoft.com] (FTDI and Prolific cables) |
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| 15 | 3 | laforge | |
| 16 | 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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| 17 | |||
| 18 | 4 | laforge | * TxD is at the tip of the plug (PC to Device) |
| 19 | * RxD is at the middle contact (Device to PC) |
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| 20 | 1 | laforge | * GND is the outer contact |
| 21 | 5 | vogelchr | |
| 22 | == Hints and Warnings == |
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| 23 | |||
| 24 | * 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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| 25 | * 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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| 26 | 11 | tsaitgaist | * Your safest bet is a USB cable with a FTDI chip (FTx232) configured for operation at 3.3V connected to a machine running Linux natively. Prolific chips (PL2303) also work, but are far less reliable. |
| 27 | 8 | vogelchr | * 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. |
