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3.3.2.4
X.25 / HDLC
Network Configuration Parameter switch 7 selects the communication protocol. The
HDLC protocol is activated when the switch is closed, or positioned towards the top of the
dipswitch. The X.25 protocol is only activated when this switch is set open, or positioned
towards the bottom of the dipswitch. The X.25 protocol is not used with the TIWAY I or
UNILINK Host Adapter, although it is an option when communicating with any Primary supporting this protocol.
3.3.2.5
NRZ / NRZI
Network Configuration Parameter switch 8 selects the method of data encoding used on
the physical communication medium. The NRZI method of data encoding provides a
mechanism for the proper decoding of received data in an asynchronous communication
environment. In fact, NRZ encoding will not work satisfactorily except in the case of
synchronous RS-232-C communication. When using Local Line, or asynchronous
RS-232-C, NRZI encoding must be used. Either type of encoding may be used with
synchronous RS-232-C communication. To select NRZI encoding, the switch should be
open, or positioned towards the top of the dipswitch. To select NRZ encoding, the switch
should be closed, or positioned towards the bottom of the dipswitch.
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Installation
TIWAY 1 TI505 NIM User Manual