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

Feature Description 
19 Line Control Characteristics 
DEFINITY ECS and GuestWorks Property Management System
Interface Specifications  555-231-601  Issue 2
December 1999
Feature Description
Line Control Characteristics
The hardware data link consists of an EIA RS232C-D serial data electrical inter-
face extended from a switch data channel. The link interface appears as a data 
communications equipment (DCE) unit (CCITT definition) with the attributes 
shown in Ta b l e 1
. See Figure 1 and Ta b l e 2 for...

DEFINITY ECS and GuestWorks Property Management System
Interface Specifications  555-231-601  Issue 2
December 1999
Feature Description 
20 Line Control Characteristics 
!CAUTION:
For the switch to recognize when the PMS link is down, the following inter-
face leads must be controlled signals: Request to Send (CA), Clear to Send 
(CB), Data Set Ready (CC), Received Line Detect (CF), and Terminal 
Ready (CD).
Figure 2. Message Word Frame Table 2. PMS Interface Lead Designations
Lead* Pin Number Function...

DEFINITY ECS and GuestWorks Property Management System
Interface Specifications  555-231-601  Issue 2
December 1999
Feature Description 
21 Line Control Characteristics 
Message Envelope
The envelope for the message text uses the following ASCII encoded characters:
nSTX: Start of data text, 0x02 (Decimal 2)
nETX: End of data text, 0x03 (Decimal 3)
nBCC: Block check code.
The character-oriented protocol used for communications exchange uses the 
following ASCII encoded characters:
nACK (Acknowledgement):...

DEFINITY ECS and GuestWorks Property Management System
Interface Specifications  555-231-601  Issue 2
December 1999
Feature Description 
22 Line Control Characteristics 
Figure 3.Message Format — Frame 2 (Normal Mode)
Figure 4. Message Format — Frame 2 (Transparent Mode) 

DEFINITY ECS and GuestWorks Property Management System
Interface Specifications  555-231-601  Issue 2
December 1999
Feature Description 
23 Line Control Characteristics 
Figure 5.Message Format — Frame 2 (ASCII Mode) 

DEFINITY ECS and GuestWorks Property Management System
Interface Specifications  555-231-601  Issue 2
December 1999
Feature Description 
24 Line Control Characteristics 
Table 3. Data Encoding of Message Text Nibbles
Va l u e4-Bit Encode
(Normal and
Transparent)8-Bit Encode
(ASCII)
0 0000 0011 0000
1 0001 0011 0001
2 0010 0011 0010
3 0011 0011 0011
4 0100 0011 0100
5 0101 0011 0101
6 0110 0011 0110
7 0111 0011 0111
8 1000 0011 1000
9 1001 0011 1001
(Note 1) 1010 (Normal Only) N/A
* (Note 2) 1011 0010...

DEFINITY ECS and GuestWorks Property Management System
Interface Specifications  555-231-601  Issue 2
December 1999
Feature Description 
25 Line Control Characteristics 
The general PMS message layout is shown in Figure 6.
Figure 6. PMS Message Layout
Each message block will be terminated by a BCC octet. The BCC is an exclusive 
“OR” of all octets following the STX through and including the ETX (the STX is not 
included in the BCC calculation). Figure 7
, Figure 8, and Figure 9 show examples 
of...

DEFINITY ECS and GuestWorks Property Management System
Interface Specifications  555-231-601  Issue 2
December 1999
Feature Description 
26 Line Control Characteristics 
Figure 7.Example Message — Normal Mode 

DEFINITY ECS and GuestWorks Property Management System
Interface Specifications  555-231-601  Issue 2
December 1999
Feature Description 
27 Line Control Characteristics 
Figure 8.Example Message — Transparent Mode 

DEFINITY ECS and GuestWorks Property Management System
Interface Specifications  555-231-601  Issue 2
December 1999
Feature Description 
28 Line Control Characteristics 
Figure 9.Example Message — ASCII Mode