Technical information

Troubleshooting and Repair
91
PBX and PMS Cannot Communicate
If the PBX’s PMS interface and the customer’s PMS computer cannot
communicate, the system will generate PMS related maintenance log
messages. Typically, PMS maintenance log messages will identify
 Operating status of the PMS
 Invalid start (STX) and end (ETX) of text message characters
 Invalid function code message characters
 Invalid status code message characters
 Invalid room number message characters.
Testing the PMS Interface of the PBX
PMS problems typically occur in these areas:
 PMS Protocol settings: Ensure that the communication parameters
between the systems match.
 PMS Programming: Verify that all the recommended PMS and
Dataset programming is complete.
 PMS Cabling: Use a straight-through cable between the customer’s
PMS computer and the Dataset.
Test the PBX’s PMS interface as follows:
1. Disconnect the customer’s PMS computer from the Dataset.
2. Connect a personal computer or terminal to the Dataset’s RS-232
port.
 Ensure that the communications parameters of the personal
computer / terminal match those expected by the PBX’s PMS
interface.
 Verify that you receive the ENQuire character from the PBX’s PMS
interface. If not, verify that all the programming and the connections
are correct.