Document No. 538-663
Installation Instructions
Rev. 5, April, 2002
Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and
models as design improvements are introduced. Other product or company names mentioned herein may be trademarks of their respective
owners. © 2002 Siemens Building Technologies, Inc.
Siemens Building Technologies, Inc.
1000 Deerfield Parkway
Buffalo Grove, IL 60089-4513
U.S.A.
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Document No. 538-663
Printed in the U.S.A.
Page 2 of 2
P1 and P2 Trunk Applications
NOTE: For PC applications, do not disable pin 7
from being earth grounded on the RS-232
device that is connected to the Trunk
Interface II. The Trunk Interface II obtains an
earth ground reference for the shield
through the computer’s RS-232 port.
1.
Attach the PMD trunk wires to the three-position
trunk connector as indicated on the rear panel
of the Trunk Interface II. The shield should be
taped back or connected as required to obtain a
single-ended earth grounded shield.
2.
Connect the stripped end of the earth ground
wire to the shield position of the PMD Trunk
Connector and connect the other end (ring
terminal) to earth ground (for example,
mounting plate screw of outlet, field panel
chassis mounting screw, or other suitable earth
ground location).
3.
Connect the RS-232 cable between the Trunk
Interface II and the computer’s RS-232 port.
4.
Plug the DC power cord into the transformer
connector on the Trunk Interface II, then plug
the power pack into the appropriate power
source (Figure 3).
Installation is now complete.
Figure 2. Trunk Interface II
Jumper Locations.
Figure 3. Rear Panel of Trunk Interface II.
