When you write a modem string, don't use any separator characters.  The only
time you might do a second @ (at) sign is in a case where you enter a string
like
atz,,,at&l3&d2&m1

and so on and so forth.  The atz sets the modem settings back to factory
defaults, the commas make it wait a couple seconds to accomplish the reset,
and the rest of the stuff is an example of the string you really want.  Just
start the string with the at and end it with ^m to terminate the string.
The rest just runs together.  The modem knows the differences, since you
have an & sign letter and number or an s followed by a number for the S
register and = and some other numbers.  That's not a well-crafted answer,
but I'm slogging through about 500 messages to catch up from a deluge.
Later!
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Brent Reynolds, Atlanta, GA  USA

"Modem," said the gardener when he'd finished the lawn

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