Lennox Hearth G8 - Manual (Page 88)

4.5 Computer Diagnostics
TracVision G8 has been designed to provide diagnostic readouts
viewed on a PC having an RS-232 serial communication port. If
you are unable to isolate a system problem, set up for computer
diagnostics as described below. System problems will most likely
be found somewhere through the diagnostic readouts.
The diagnostics procedure requires Windows Hyperterminal (or
other terminal emulation software, such as PROCOMM). Use the
settings appropriate to your application.
1. Connect one end of the PC data cable to
the DB9 maintenance port connector on the rear of
the MCU. Connect the other end to the serial port
on your PC (a 9-pin/25-pin connector adapter may
be needed for some PCs).
2. Open the terminal emulation software and
establish the following settings:
• 9600 baud
• no parity
• 8 data bits
• 1 start bit
• 1 stop bit
• no flow control
3. Apply power to the TracVision G8 system and
allow the system to complete full initialization.
Data should be scrolling on the PC display to
identify any system problems detected. If no data
is seen, recheck your connections and the terminal
software setup.
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TracVision G8 Owner’s Manual - Guide to Technical Information
Figure 4-3
MCU Maintenance Port
Maintenance Port