Chapter 4 _______________________________________________________________ Installation
VAISALA ______________________________________________________________________ 125
right side of the measurement unit which are now accessible
through the mast adapter of the support unit. See Figure 78 on page
118.
Connecting Signal Lines to Receiver Interface Unit
1. Open the interface unit box. See Figure 63 on page 107.
2. Wire the cables through the cable feed-throughs at the bottom of
the box.
3. Connect the cables that are shown circled in Figure 84 on page 126.
4. The receiver interface unit must be connected to the
two-wire RS-485 module bus (terminals 8 and 10) which connects
all intelligent modules within the LT31 system with each other. In
addition, a two-wire synchronization line (terminals 6 and 7)
connects the modulation clock between transmitter and receiver.
NOTE
The cable shield must be properly grounded in the cable gland of the
interface unit enclosure, see Figure 35 on page 77
5. Tighten the cable feed-through carefully, wind the rest of the cable
length to a ring and secure it with standard cable tabs. For details,
see section Communication Cable on page 76.
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