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NDA-30115 Revision 1.0 Page 11
Property Management System - Communication Interface Architecture
Table 2-5 Line Control Characteristics
Item Conditions
Control Method Contention method (point to point)
Operating Mode Half duplex (if modems are used, set to full duplex)
Synchronization Synchronous
Data Rate 4800 or 9600 bits/second (bps)
Frame Contents EBCDIC
Error Control Method CRC-16 (X
16
+ X
15
+ X
2
+ 1)
Bit Transmission Order Priority is given to low order bits
Transmission Intervals At each data generation. When a stream of information is
transmitted to the NEAX continuously, an interval of 0.5
seconds or more should be given between messages. Each
message must be delimited by the EOT code.
Priority Sequence Primary office: NEAX
Secondary Office: PMS
Transfer Mode Non-transparent mode
Message Composition One message constitutes one record; SOH, ITB and ETB
are not used. Only the non-transparent mode is used.
Message Length Variable length, maximum of 128 characters (including
STX and ETX).
Electrical Interface RS-232C electrical standard interface
Signal Form RS-404
Interface Distance 50 feet
Word Framing 10 bits or 11 bits