Point-To-Point Wiring - GE DigitalFlow DF868 Programming Manual

March 2008

Point-To-Point Wiring

6-4
Standard factory wiring of the RS485 serial interface is configured for
point-to-point wiring. That is, a single Model DF868 may be wired
directly to a single personal computer. To connect the RS485 serial
interface, refer to Figure 6-1 on page 6-3 and complete the following
steps:
Note: For compliance with the European Union's Low Voltage
Directive (73/23/EEC), a transparent plastic shroud protects
the electrical connections. The shroud must remain in place,
except while wiring the unit. Reinstall the shroud after the
wiring has been completed.
1. Disconnect the main power to the electronics console and open the
cover.
Dangerous voltages exist within the electronics console.
Do not perform any wiring operations until the main
power to the unit has been disconnected.
2. Remove the clear plastic shroud that covers the electrical
connectors.
3. 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.
4. 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 point-to-point operation.
IMPORTANT:
The installed version of the Model DF868 software
must be Version F2Z or higher to support RS485
operation. If necessary, contact the factory for
information about a software upgrade.
!WARNING!
Serial Communications