Emerson ROSEMOUNT OCX 8800 - Manual (Page 48)

Instruction Manual
IM-106-880, Rev 1.0
January 2007
OCX 8800
4-4
HART COMMUNICATOR
PC CONNECTIONS There is an option to interface the HART communicator with a personal
computer. Load the designated AMS software into the PC. Then link the
HART communicator to the PC using the interface PC adapter that connects
to the serial port (on the communicator rear panel). Refer to the proper HART
communicator documentation in regard to the PC interface option.
Off-line and On-line Operations
The HART communicator can be operated both off-line and on-line.
Off-line operations are those in which the communicator is not connected to
the OCX 8800. Off-line operations can include interfacing the HART
communicator with a PC. (Refer to applicable HART documentation regarding
HART/PC applications.)
In the on-line mode, the communicator is connected to the oxygen 4-20 mA
analog output signal line. The communicator is connected in parallel to the
OCX 8800 or in parallel to the 250 ohm load resistor.
The opening menu displayed on the LCD is different for on-line and off-line
operations. When powering up a disconnected (off-line) communicator, the
LCD will display the Main Menu. When powering up a connected (on-line)
communicator, the LCD will display the On-line Menu. Refer to the HART
communicator manual for detailed menu information.