Dev=Mio (Modem In & Out) - Digi PortServer II User Manual

Wiring required: Modem connections require that TD, RD, DCD, DTR and GND are
always wired in the cable. With multispeed, data compressing modems, you may also
need to wire RTS and CTS for hardware flow control.
dev=mio (Modem In & Out)
Use this device type for a bi-directional modem, requiring full DTR/DCD support.
When the modem is idle, PortServer II leaves DTR high so the modem will answer
incoming calls.
If DCD goes high when the device is idle, PortServer II assumes an incoming connec-
tion has been requested and acts like a dev=min device until the device goes idle
again.
If an outgoing connection succeeds when the device is idle, PortServer II switches into
outgoing mode and acts as a dev=mout device until the connection is dropped. DTR
remains low for two seconds to assure a clean modem disconnection, and then input is
flushed to discard messages such as DISCONNECT messages.
Wiring required: Bidirectional modem connections require that TD, RD, DCD, DTR
and GND are wired in the cable. With multispeed, data compressing modems, you
may also need to wire RTS and CTS for hardware flow control.
90030500B Installation Page 51