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NDA-30115 Revision 1.0 Page 3
Property Management System - Communication Interface Architecture
Chapter 2 Architecture
The PMS communicates with the NEAX over one or more serial cables. A
maximum of three lines can be provided as data links between the NEAX and the
PMS.
The three lines are designated as Line 1, Line 2 and Line 3. Line 1 is used for
Hotel Processing messages; Line 2 and Line 3 are used for Interactive
messages.
Hotel Processing messages, such as Check In, Check Out and Message
Waiting Lamp control, have less severe real-time requirements than
interactive messages. Line 1 is only utilized for these messages and they will
never be sent over Line 2 or Line 3.
Interactive messages are the Direct Data Entry messages and Maid Status
Answerback messages. These messages require real-time interaction
between the PMS and the NEAX and can therefore be isolated from the
Hotel Processing messages. If Line 2 is installed, these messages will be
transmitted over that line. If Line 2 and Line 3 are installed, these messages
will load share over both lines. If only Line 1 is installed, these messages
will be transmitted over Line 1.
The use of Line 1 is mandatory. If only Line 1 is installed, all messages are
transmitted over it. Also, if Model 60 is being used, only Line 1 is necessary,
as all of the Interactive messages are exclusive to Model 90.
It is very rare for Line 2 or Line 3 to be required. They are only needed if the
traffic between the PMS and the NEAX is to be exceptionally heavy. And
even the heavy traffic should only require Line 2.
The PMS may communicate with the NEAX through either an
asynchronous transmission protocol or a bisynchronous transmission (BSC)
protocol.