Caller ID on an SX28
LoopyByteloose
Posts: 12,537
I can locate the code, but I cannot locate a good schematic of the SX Modem Demo board.· Only half the puzzle.
Some guys in the·Basic Stamp Forum·are trying to buy some quite expensive Caller ID chips and I am trying to see if this is easier procurement.
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"If you want more fiber, eat the package.· Not enough?· Eat the manual."········
Post Edited (Kramer) : 7/13/2006 9:48:44 AM GMT
Some guys in the·Basic Stamp Forum·are trying to buy some quite expensive Caller ID chips and I am trying to see if this is easier procurement.
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"If you want more fiber, eat the package.· Not enough?· Eat the manual."········
···················· Tropical regards,····· G. Herzog [noparse][[/noparse]·黃鶴 ]·in Taiwan
Post Edited (Kramer) : 7/13/2006 9:48:44 AM GMT
Comments
Of course I've got to let you know that if you get me started in the SX direction I'm going to come on here and bug everyone when I can't figure something out.
But I am afraid all the modem and telephony work has been done in Assembler [noparse][[/noparse]circa 1999] and Virtual Peripherals.
I did locate a schematic, but it looks to me that one might easily buy a Caller ID modem for about the same cost as building the device. And you would have a 'telephone company approved' interface.
There are basically 5 parts to the construction. The ring indication circuit, the impedance matching ring and tip isolation for incoming data, an OPamp filtering circuit, the SX as decoder/converter, and the RS-232 chip [noparse][[/noparse]a Max232] for output.
Still, someone mentioned this was for their employer. So buying the modem is a conservative business-like approach. You have warrenties, a package in a chassis, and so forth.· Just a quick Google came up with one for less than $20 that takes a card slot on a PC.
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"If you want more fiber, eat the package.· Not enough?· Eat the manual."········