Dev=Prn (Printers); Dev=Min (Modem In); Dev=Mout (Modem Out) - Digi PortServer II User Manual

dev=prn (Printers)

PortServer II treats printers as outgoing devices that ignore DCD. Any incoming char-
acters are also ignored, until an outgoing connection is established. When a connec-
tion is established DTR is raised, otherwise DTR is low. Unlike modem device types,
there is no two second hangup.
This device type can also be used for general purpose outgoing connections
Wiring required: Generally, only TD, RD, and GND connections are needed.

dev=min (Modem In)

Use this device type for a modem that is used for incoming communications only.
DTR and DCD are supported. In this mode, PortServer II ignores all input until DCD
appears. Then it "flushes" all input for two seconds to discard messages like RING
and CONNECT, before it spawns a login or attempts a connection.
Whenever DCD drops, PortServer II drops DTR. All connections terminate, and any
user is logged out.
When a user logs out or (on an autoconnect port) the remote system drops the connec-
tion, DTR is dropped to hang up the modem. DTR remains low for two seconds to
assure a clean modem disconnection, and then input is flushed to discard messages
such as DISCONNECT.
Wiring required: Modem connections require that TD, RD, DCD, DTR and GND
should always be wired in the cable. With multispeed, data compressing modems, you
may also need to wire RTS and CTS for hardware flow control.

dev=mout (Modem Out)

Use this device type for a modem requiring outgoing communications only, with full
DTR/DCD modem support.
Until an outgoing connection is made, DTR remains low, keeping the modem from
answering. When an outgoing connection succeeds, DTR is raised.
The state of DCD is ignored until there is a high-low transition of DCD. This closes
the connection, and drops DTR. DTR then remains low for two seconds to assure a
clean modem disconnection, and then input is flushed to discard messages such as
DISCONNECT.
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