NEC NDA-30115-001 User Manual
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.
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
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.
are not used. Only the non-transparent mode is used.
Message Length
Variable length, maximum of 128 characters (including
STX and ETX).
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