GE DigitalFlow GF868 Programming Manual page 92

Chapter 6. Serial Communications
6.5.3 Multi-Point Wiring (cont.)
6.5.3a Reconfiguring a Serial Interface Converter (cont.)
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.
6.5.3b 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).
Note: The XMT+ terminal on the barrier strip is the screw opposite the red wire connection and the XMT– terminal
on the barrier strip is the screw opposite the green wire connection.
3. Reinstall the clear plastic shroud, close the cover to the electronics console and reconnect the main power.
The RS485 serial interface is now ready for multi-point operation.
IMPORTANT:
The installed version of the Model GF868 software must be Version 3G or higher to support RS485
operation. If necessary, contact the factory for information about a software upgrade.
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Table 23: Switch Assembly Settings
Position # Point-To-Point
1 ON
2 ON
3 ON
4 OFF
Multi-Point
OFF
ON
ON
OFF
DigitalFlow™ GF868 Programming Manual (2-Channel)