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From: steveh@hpcvra.cv.hp.com. (Steve Harper)
Newsgroups: comp.sys.handhelds
Subject: Re: Using HP-48 with modem
Message-ID: <25590132@hpcvra.cv.hp.com.>
Date: 11 Apr 91 15:37:27 GMT
References: <21978@shlump.nac.dec.com>
Organization: Hewlett-Packard Co., Corvallis, OR, USA
Lines: 15


Modems are a variable lot ...  But they normally do expect
to have their RTS (request to send) and DTR (data terminal
ready) lines asserted (>3V or so).  The HP 48 doesn't have
these signals.  It implements only a simple "3-wire" serial
interface (transmit data, receive data, and signal ground).
Most modems have either hardware or software configuration
switches that tell the modem to ignore (or not to ignore)
the state of these handshake lines (RTS, DTR).  How these
switches are twiddled varies widely depending on the model
and manufacturer of the modem.  If you set your modem
configuration to ignore the state of the handshake lines,
it should work just fine with the HP 48... Good luck!

Steve