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9: <A HREF="mpd.html"><EM>Mpd 5.9 User Manual</EM></A>
10: <b>:</b> <A HREF="mpd42.html"><EM>Device Types</EM></A>
11: <b>:</b> <EM>Modem type commands</EM><BR>
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17: <H2><A NAME="43"></A>5.1. Modem type commands<A NAME="modem"></A></H2>
18: <p>This chapter describes commands that are specific to modem type links.
19: These commands apply to the currently active link, and are only
20: valid if the currently active link has type <b>modem</b>.</p>
21: <p>
22: <dl>
23:
24: <dt><b><code>set modem device <em>devname</em></code></b><dd><p>Modem links operate over serial ports. This command tells mpd
25: which serial port to use for this link, and is required.
26: The <code><em>devname</em></code> should be the pathname of a serial
27: device, e.g., <code>/dev/cuau0</code>.</p>
28:
29: <dt><b><code>set modem var <em>$variable</em> <em>string</em></code></b><dd><p>Pre-sets the chat script variable <code><em>$variable</em></code> to contain
30: the string <code><em>string</em></code>. See
31: <A HREF="mpd50.html#chat">the chapter on chat scripting</A> for more information
32: on chat variables.</p>
33:
34: <dt><b><code>set modem speed <em>speed</em></code></b><dd><p>This commands sets the initial serial port speed when opening
35: the serial device, e.g., 9600, 57600, 115200. Note that you can
36: always change the serial port speed later from within the chat script.</p>
37:
38: <dt><b><code>set modem script <em>connect-script</em></code></b><dd><p>This command tells mpd which chat script to run in order to initiate
39: a PPP connection for this link. The <code><em>connect-script</em></code>
40: should correspond to a label in <code>mpd.script</code>. Mpd will jump
41: to this label after opening the serial port device. If
42: <code><em>connect-script</em></code> is not set, then the chat phase
43: of the connection is skipped (e.g., if you have a direct null modem
44: connection).</p>
45:
46: <dt><b><code>set modem idle-script <em>idle-script</em></code></b><dd><p>This command tells mpd what to do with the serial port when the link is
47: not connected. If no <code><em>idle-script</em></code> is set, then mpd will
48: leave the serial port closed when not connected. Otherwise, when the
49: link is disconnected mpd runs the <code><em>idle-script</em></code> chat
50: script. If this script returns <code>failure</code>, then mpd
51: restarts the script.</p>
52: <p>Otherwise, (i.e., if it returns <code>success</code>) mpd examines the
53: contents of the <code>$IdleResult</code> chat variable to decide what to do
54: next. If it equals
55: <code>answer</code> then mpd will assume that an incoming call has been
56: answered and immediately enter PPP negotiation. If it equals
57: <code>ringback</code> then mpd will close the serial port, reopen it,
58: and initiate an outgoing connection normally (i.e., using
59: <code><em>connect-script</em></code>). </p>
60: <p>If <code>$IdleResult</code> contains anything else or is not set, then
61: mpd acts as if <code>failure</code> had occurred and simply restarts
62: the script.</p>
63:
64: <dt><b><code>set modem watch <em>+/-signal ...</em></code></b><dd><p>Mpd normally tracks the carrier detect signal on the serial port
65: and drops the connection when this signal is lost. You can disable
66: this behavior with <code><b>set modem watch -cd</b></code>. Also,
67: mpd can do the same thing with the DSR signal, though the default
68: is to ignore DSR. To enable watching of the DSR signal, use
69: <code><b>set modem watch +dsr</b></code>.</p>
70:
71: </dl>
72: </p>
73:
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75:
76: <HR NOSHADE>
77: <A HREF="mpd.html"><EM>Mpd 5.9 User Manual</EM></A>
78: <b>:</b> <A HREF="mpd42.html"><EM>Device Types</EM></A>
79: <b>:</b> <EM>Modem type commands</EM><BR>
80: <b>Previous:</b> <A HREF="mpd42.html"><EM>Device Types</EM></A><BR>
81: <b>Next:</b> <A HREF="mpd44.html"><EM>Netgraph device type commands</EM></A>
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