Lucent Technologies DEFINITY Enterprise Communications Server And GuestWorks Property Management System Interface Specifications

DEFINITY ECS and GuestWorks Property Management System
Interface Specifications  555-231-601  Issue 2
December 1999
Feature Description 
29 Exchange Protocol and Message Responses 
The ACK and NAK control characters are transmitted back to the sender by the 
receiver to indicate positive or negative acknowledgment to the transmitted 
message, respectively. An ACK means that the message was received and the 
sender can continue with another message. A NAK means that the message was 
not received and that...

DEFINITY ECS and GuestWorks Property Management System
Interface Specifications  555-231-601  Issue 2
December 1999
Feature Description 
30 Exchange Protocol and Message Responses 
Sending Rules
The sender must adhere to the following rules:
1. The BCC must be calculated for characters following the STX, including 
the ETX, and transmitted as the terminating character of a message 
packet. If the BCC is incorrect, the receiver will respond with a NAK.
2. The entire message (STX to BCC) must be...

DEFINITY ECS and GuestWorks Property Management System
Interface Specifications  555-231-601  Issue 2
December 1999
Feature Description 
31 Exchange Protocol and Message Responses 
6. Upon receipt of a NAK from the receiver, the sender will retransmit the cur-
rent message using the same message count (up to MRR attempts - see 
next note); retransmission must be started within the LAT after receipt of 
the NAK. If the transmission is not started (or an ENQ received) within LAT, 
the switch will drop the...

DEFINITY ECS and GuestWorks Property Management System
Interface Specifications  555-231-601  Issue 2
December 1999
Feature Description 
32 Exchange Protocol and Message Responses 
5. After transmitting the ACK/NAK response, the receiver must repeat the 
previous reply if an ENQ is received within the LAT after the original trans-
mission of the ACK/NAK; this may be repeated until the maximum MRR 
(for a total of MRR received ENQs at LAT intervals). If the receiver does not 
reply, the sender transmits...

DEFINITY ECS and GuestWorks Property Management System
Interface Specifications  555-231-601  Issue 2
December 1999
Feature Description 
33 Link Setup and Drop Conditions 
Link Setup and Drop Conditions
Link Setup
The PMS, if operational, must have the Data Terminal Ready EIA pin in the “on” 
state. The switch attempts to bring the link up by placing an internal call to the 
extension of the data module connected to the PMS. This call sets the Data Set 
Ready EIA pin to the “on” state which allows the...

DEFINITY ECS and GuestWorks Property Management System
Interface Specifications  555-231-601  Issue 2
December 1999
Feature Description 
34 Message Text Format Structure and Encoding 
Message Text Format Structure and 
Encoding
Figure 11 shows the general format for a message packet. Information in the text 
is treated as 8-bit characters. However, these characters are interpreted as either 
two 4-bit encoded digits (nibbles) (N) or ASCII characters (T) (A). Consequently, a 
zero valued most significant...

DEFINITY ECS and GuestWorks Property Management System
Interface Specifications  555-231-601  Issue 2
December 1999
Feature Description 
35 Message Text Format Structure and Encoding 
In transparent mode, the Data Link Escape (DLE) character is used to precede 
any characters in the message text that have a value also used by “control 
characters” (0x00 to 0x1f) to distinguish message text from control characters (for 
example, STX), since 0x0 to 0xa conversion cannot be used. As an example, the...

DEFINITY ECS and GuestWorks Property Management System
Interface Specifications  555-231-601  Issue 2
December 1999
Feature Description 
36 Message Text Format Structure and Encoding 
The PROC CODE nibble denotes a “process code.” This code represents a 
specific action or processing for that feature message. In normal mode and 
transparent mode, the PROC CODE is in Frame 2. In ASCII mode, the PROC 
CODE is found in Frame 6.
The (FEAT CODE, PROC CODE) notation is used throughout this document to 
denote...

DEFINITY ECS and GuestWorks Property Management System
Interface Specifications  555-231-601  Issue 2
December 1999
Feature Description 
37 Message Text Format Structure and Encoding 
For the Transparent Mode, the following encoding rules apply to all message 
frames (any frame between the STX and ETX):
nThe DLE character must precede any control character (valued 0x00 
to 0x1f) in the message text.
nLeading zeros are used for nibbles of data items that are lower in value 
than the allotted space; for...

DEFINITY ECS and GuestWorks Property Management System
Interface Specifications  555-231-601  Issue 2
December 1999
Feature Description 
38 Message Text Format Structure and Encoding 
Message Text Ordering
The RSN, housekeeper information digits, coverage path, name fields, and 
restriction level consist of several nibbles or characters which have a defined 
ordering.
nRSNs for the normal and transparent modes are mapped from the least 
significant digit to the most significant digit (backwards...