March 2008
6-6 Serial Communications
Reconfiguring a Serial
Interface Converter (cont.)
Figure 6-2: Opening the Converter Case
7. Reassemble the serial interface converter and secure it to the
mounting bracket with the two mounting screws.
8. Reinstall the mounting bracket into the electronics enclosure and
secure it with the standoff and the grounding screw.
Wiring the System After the serial interface converters have been configured for multi-
point operation, the system can be wired.
1. Using twisted-wire pairs, connect the XMT+ terminals of all the
flowmeters together and connect the XMT– terminals of all the
flowmeters together.
IMPORTANT: Make sure that the flowmeter with the non-modified
converter is wired as the last unit in the chain.
2. Using a twisted-wire pair, connect the XMT+ terminal of the
barrier strip to the T+/R+ terminal of the PC’s RS485 adapter and
connect the XMT– terminal of the barrier strip to the T-/R-
terminal of the PC’s RS485 adapter (see the documentation
provided with the RS485 adapter for details).
Table 6-2: Switch Assembly Settings
Position # Point-To-Point Multi-Point
1ONOFF
2ONON
3ONON
4OFFOFF
Plastic Case
Mounting Screw
DB9 Connector
Screwdriver
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