User`s guide

LONWORKS FTT-10A Transceiver User’s Guide A-9
Floor-Mounted Power Strip
Wooden Test Table
SLTA-10
Stub
Unit
1 Meter Network
Cable
FTT
Termination
RS-232
Serial
Cable
SLTA-10
Echo
Unit
HP-95
Palmtop PC
Figure A.6 Test Setup for EMI Scan of theSLTA-10 Adapters (Top View)
The SLTA-10 test setup included two SLTA-10 adapters, each with an FTT-10A
transceiver operating at 10MHz. The setup used an HP-95 palmtop PC to send serial
RS-232 data to the Echo Unit, and the data were sent via the FTT-10A network to
the Stub Unit. The Stub Unit returned the data back to the Echo Unit, which then
sent the data back to the PC via the RS-232 serial cable. The returned data pattern
was checked for accuracy by the PC, and the process was then repeated.
The results of the10m EMI scan are plotted together with the 5MHz FTT-10A
transceiver comparison scans in figure 28. The 5MHz FTT-10, 5MHz FTT-10A, and
10MHz SLTA-10 test setup all demonstrate compliance with the EN 55022-B limit
with margin.