User`s manual

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Linux Virtual COM user manual

Using TTYredirector

3. Initializing Remote Ports

If you are using a device server that supports the Telnet protocol with RFC 2217 extensions, TTYredirector is able to improve your

access to server devices in three ways:

• Each time you open a TTYredirector device, the corresponding remote port on the server can be initialized to your settings for

baud rate, data length, and the other options described below.

• TTYredirector throttles the output data rate (from the client computer to the device server) to match any specified baud rate for

the TTY.

• TTYredirector cooperates with the device server to manage the flow of data between the client computer and the server to pre-

vent overrun conditions.

The potential benefit of using a server that supports RFC 2217 is compatibility with certain applications that require more control

of serial ports.

NOTES:

 •Thedefaultsettingsfortheseoptionsistohavenoeffectontheserver.Ifyoudonotusethesecommands,the

corresponding settings on the device server are not affected. Effectively, the settings on the server are the default settings.

 •ThedevparameterinthecommandsbelowfollowstherulesspecifiedinManagingTTYDevices.

 •Ifanoptionisspecifiedwithoutavalue,thesettingisthedefaultvaluefortheoption.

 •Shortformsofoptionnamesappearonalinefollowingthelongform.

 •Theseoptionscanbecombinedinanyorderinasinglecommand.

 •Forthestatusvaluesreturnedbytrconfig,seetheTechnicalNotes.

A. Speed (baud rate), length, parity, stop bits

trconfig -tty dev -speed b

trconfig -y dev -E b

b — Baud rate: any positive integer, with common values being 110, 300, 600, 1200, 2400, 4800, 9600, 19200, 38400,

57600, 115200

trconfig -tty dev -length n

trconfig -y dev -L n

n — Data length: 5, 6, 7 or 8

trconfig -tty dev -parity p

trconfig -y dev -P p

p — Parity: even, odd, mark, space, none

trconfig -tty dev -stop s

trconfig -y dev -S s

s — Stop bits: 1, 1.5, 2

B. DTR / RTS line status

trconfig -tty dev -dtr d

trconfig -y dev -D d

d — 0 or 1, the state to set when the TTY is opened