Eicon Networks CX1 Instalační manuál stáhnout pdf (Strana 67)

G&R

The Asynchronous (TTY) handler

You start the TTY handler (gl_tty) when you specify -li tty as the line

handler for a Host Links product. It is only available for the UNIX/Linux

version of Host Links.

Making connections using TTY

Accepting a connect

The TTY handler accepts connects in the sense that it sees the status of the line

change if the other side (e.g. a modem) takes up the correct signals, and reports

this as an incoming connect to the Host Links product.

Issuing a connect

TTY connections are always two-way simultaneous. Any concept of ‘turn’ to

determine who may send data must be implemented in the applications. By

default, TTY works completely asynchronously i.e. all data delivered to TTY is

transmitted immediately on the line, and all data received is delivered

immediately to the Host Links product with enclosure none. This applies

even to single characters, so products running in ‘echo’ mode can use the TTY

handler.

There are parameters for setting various control characters as the ‘end of

record’ marker. These parameters implement ‘block mode’ operation. Incoming

data is scanned for the end of record marker, and when found the accumulated

data is delivered as an ‘end of group’ enclosure, which may be interpreted as

‘turn’.

When sending data there are parameters to map enclosure level to control

characters used as ‘end of record’ markers. This functionality is used to deliver

the concept of enclosure and turn to our Glink emulator running on a PC

when connected by an asynchronous line. This is necessary for some

‘synchronous’ emulation modes, particularly Questar DKU emulation.

Gline Line Handlers and Configuration

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Eicon Networks CX1 Instalační manuál Strana 67