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Serial Cable » History » Version 15

Anonymous, 02/19/2016 10:48 PM
Handy style generates a 404, no use of perma-link

1 5 vogelchr
The Calypso phones typically all have a serial port @ 3.3V levels on the 2.5mm earphone jack.
2 1 laforge
3 3 laforge
Those cables are sometimes called ''T191 unlock cable''.
4 1 laforge
5 3 laforge
You can either buy ready-made cables, e.g. at:
6 7 tsaitgaist
 * USB variant
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  * [http://www.gsmliberty.net/shop/motorola-t191-dataunlock-cable-p-1252.html gsmliberty.net]
8 9 laforge
  * [http://www.fonefunshop.co.uk/datacables/motorola.htm fonefunshop.co.uk]
9 13 tsaitgaist
  * [http://gsmserver.com/cables/Smart-Clip_Cable_for_Compal_Chi_Mei_based_phones.php gsmserver]
10 7 tsaitgaist
 * RS232 variant, you still need a separate standard USB/RS232 cable
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  * [http://www.cellcorner.com/xshp/unlock-phone-codes/motorola-t190-t191-t193-unlock-data-cable.html cellcorner.com]
12 10 laforge
 * USB/RS232 cable 
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  * [http://www.tronisoft.com/cat_usbtoserial.php tronisoft.com] (FTDI and Prolific cables)
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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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 * TxD is at the tip of the plug (PC to Device)
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 * RxD is at the middle contact (Device to PC)
19 1 laforge
 * GND is the outer contact
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== Hints and Warnings ==
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 * 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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 * If your development system is virtualized (runs inside VMware, Virtualbox, Parallels...) the connections can be unreliable (the loader protocol is timing critical).
25 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.
26 14 steve-m
 * 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 or [wiki:CP210xTutorial CP210x] based USB adapter cable.
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