Point-To-Point Wiring - GE Panametrics GF868 Programming Manual

Point-To-Point Wiring

Serial Communications
Standard factory wiring of the RS485 serial interface is configured
for point-to-point wiring. That is, a single Model GF868 may be
wired directly to a single personal computer. To connect the RS485
serial interface, refer to Figure 6-1 on the previous page 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. For units so equipped, 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 XMT+ terminal of the personal computer and
connect the XMT– terminal of the barrier strip to the XMT–
terminal of the personal computer.
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 (for units so equipped), close the
cover to the electronics console and reconnect the main power.
The RS485 serial interface is now ready for point-to-point operation.
However, the installed version of the Model GF868 software must
support RS485 operation for the interface to work properly. If
necessary, contact the factory for information about a software
upgrade.
!WARNING!
April 2004
6-5