Electrical Installation - Field and Host Port Connections
Part No.: 4417590_Rev13 CIU 888
Installation Manual 3 - 5
3.4.2 TRL/2 Field Bus
A maximum of 48 gauges can be connected to the CIU 888. Gauges
should be divided over the field ports with a recommended maximum of
8 instruments per line. Best results are obtained when the TRL/2 field
bus signal to the gauges can be connected in a “Multi-drop”
configuration. Refer to FIGURE 3-2. TRL/2 Field Bus Board (TRL/2
Board) can be placed in any of the option slots 1 – 6.
FIGURE 3-4 TRL/2 Field Bus
Connect the TRL/2 Field bus cable to the two outer terminals of the
connector at the Field Port. The TRL/2 field bus signal is not polarity
sensitive. The shield of the TRL/2 field bus cable must be connected to
the centre terminal. Refer to FIGURE 5-3.
See section 3.3 "CIU 888 Interface Summary" for locating the ports.
NOTE: Number of instruments per TRL/2 field line depends on the cable specifi-
cations and the total cable length.
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