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Page 12 NDA-30115 Revision 1.0
Architecture Property Management System - Communication Interface
The control codes used for the message texts are:
Table 2-6 Control Codes
Control Code
Hexadecimal
Value
Function
SYN 32 Synchronization code.
STX 02 Indicates the start of a block.
ETX 03 Indicates the end of a block.
ENQ 2D Used as the start sequence code. It indicates a reception
request to the other side and a request to answer an infor-
mation block just sent.
EOT 04 Indicates the end of transmission of a block or release of
the data link by the sender.
ACK0 10, 70 Used alternately, these indicate the positive acknowledg-
ment of an information block or a start sequence.
ACK1 10, 61
NAK 3D Indicates the negative acknowledgment of an informa-
tion block or a start sequence.
WACK 10, 6B Used as the positive acknowledgment of an information
block or start sequence and indicates that the receiver
temporarily cannot receive data from the sender.
TTD 02, 2D Indicates that the sender cannot transmit the next infor-
mation block after the receipt of the answer to the previ-
ous information block sent from the receiver.
RVI 10, 7C Indicates the positive acknowledgment of an information
block and asks the sender for sending rights.
PAD-L 55 Indicates the absolute beginning of the entire informa-
tion block.
PAD-T FF Indicates the absolute ending of the entire information
block.