User`s guide

9-4 YesWare PMS integration
Software Release 2.30 YesWare Applications User’s Guide 08-01016-01
YWS isolated connection to PMS
Figure 9-2 shows the YWS isolated connection to the PMS. The isolated
connection method consists of connecting a pair of short-haul modems or line
drivers between the YWS and the PMS. The modem pair serves to boost the
signal from the YWS to the PMS to ensure the integrity of the signal, and also
isolate the YWS from damage caused by transient voltages. Note the following
requirements about this type of connection:
• Use this method when the YWS is more than 50 ft (15 m) from the PMS
interface, or if isolating and protecting the connection is a priority.
• The line driver or short-haul modem on the YWS end must be set to DCE.
• The two transmit wires on one modem/line driver must connect to the two
receive wires on the other.
• The DTE/DCE setting of the modem/line driver on the PMS end is
dependent on whether the PMS interface is DTE or DCE.
Procedure 9-1 on page 9-5 describes how to determine if the PMS is a DCE or
DTE device.
Figure 9-2
YWS isolated connection to PMS