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Software Vault: The Gold Collection
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HAYVAX.TXT
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1993-07-04
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Downloaded from Hayes BBS July 4, 1993
Permission to freely distribute.
4.0 Dial-up Access to DEC VAX Computers using Hayes Modems
This Technical Note provides instructions for connecting Hayes modems
to DEC VAX computers running under the VMS Operating System.
Information in this Technical Note includes configuration of the
personal computer and of the VAX port to take full advantage of
V-series system product adaptive compression. The configuration assumes
V-series system products are connected to the host and allows dialup
access by both V-series and non-V-series modems.
Important: In all configurations, the cables used to connect the modem
to the DTE (whether the PC or the VAX port) must support specific
signalling requirements, with fully-shielded connectors. The cables
appropriate for specific modem to PC connections are available from
Hayes. For a description of each pin and its use in the various
communication modes, see section 4.3, Modem-to-DTE Cable Requirements,
at the end of this technical note.
4.1 Remote System Configuration
This section explains the procedures for configuring the modem attached
to the remote terminal, and special software considerations when using
a PC as a VT terminal.
4.1.1 Terminal/PC Modem Setup
A VT terminal can access the DEC VAX over dialup lines. Because
terminals cannot use software, the modem must be configured directly
using the Hayes Standard AT Command Set. Set the terminal port speed to
19200 bps for V-series Smartmodem 9600 and to 9600 bps for other
V-series system products. Because VT terminals support only XON/XOFF
flow control, configure the modem to match this setting. Connect the
modem to the terminal via an RS-232 cable and issue the following
commands.
AT&F<CR>
AT&C1&D2&K4&W0<CR>
where:
&F Restores factory settings
&C1 DCD tracks actual carrier status
&D2 Modem hangs up on loss of DTR
&K4 Enables XON/XOFF flow control (V-series
system products only)
&W0 Stores settings in User Profile 0 *
* Early models of the Smartmodem 2400 support a single user profile.
Refer to the user documentation to determine the capabilities; if the
manual is unavailable, issue the command lines AT&F<CR> and AT&V<CR>
(must be issued as two separate command lines) to view the stored
profile(s) and telephone number(s). If the modem returns an error, only
one profile is available. To configure this modem for the desired mode,
replace &W0 with &W.
When accessing a VAX from a remote PC, communications software performs
the modem configuration and the above co