QE20 Fibre Networking User Manual Document: LT0732
Page 4-6 24 May 2023 Issue 1.0
Serial Port Diagnostics
A PC running a terminal emulator program can be connected to the RS232 port
(DIAGS/PROGRAMMING J8) on the VIF module, using a straight-through 9 pin male
to 9 pin female RS232 cable (such as LM0138). In the terminal emulator select the
required comms port, 9600 baud, no parity, 1 stop bit.
The VIF will log attempted calls, incoming ringing, etc. Note the first 4 characters of
each line are the time in milliseconds displayed in hexadecimal. This free-running
timer wraps from FFFF to 0000 every 65.536 seconds.
The VIF logs the following events.
Displayed on power-up. The VIF firmware version is
x.xx.
The board address set on the DIP switches has
changed to xx.
A ringing signal has been detected on the PA line.
A ringing signal has been detected on the WIP line.
A voltage of ‘forward’ polarity has been detected on
the PA line.
A previously detected ‘forward’ polarity on the PA line
has ended.
A voltage of ‘reverse’ polarity has been detected on
the PA line.
A previously detected ‘reverse’ polarity on the PA line
has ended.
A voltage of ‘forward’ polarity has been detected on
the WIP line.
A previously detected ‘forward’ polarity on the WIP
line has ended.
A voltage of ‘reverse’ polarity has been detected on
the WIP line.
A previously detected ‘reverse’ polarity on the WIP
line has ended.
The VIF has answered a call on the PA line.
The VIF has answered a call on the WIP line.
The VIF has disconnected a call on the PA line.
The VIF has disconnected a call on the WIP line.
The VIF is calling phone number xx on the PA line.
The VIF is calling phone number xx on the WIP line.
The VIF is dialling phone number xx on the PA line.
The VIF is dialling phone number xx on the WIP line.
The VIF has completed dialling the phone number on
the PA line.
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