User Manual for
AML Oceanographic’s
Plus
X
23
Support
Troubleshooting
Instrument fails to communicate:
•
Is the connector damaged?
•
Check the cables
o
Is the data/power cable connected to the instrument and computer?
o
Are there any cuts in the cable?
o
If using a cable other than an AML cable, it should be configured as a null modem
cable.
o
If using multiple cable lengths, the extensions should
not
be configured as null
modem cables.
•
If using external power over a long cable, check the voltage drop over the cable. Measure
the voltage across a 10 watt, 27Ω resistor across pins 1 and 4 of the c
able. The voltage
should be between 9.9 and 26 volts.
•
Are the communication settings in the program used on the computer correct?
o
Comm port selection
o
8 bits
o
1 stop bit
o
No parity
o
No hardware flow control
o
Baud rate between 600 and 38,400 baud
•
Are the communication settings in the instrument correct?
o
Was the instrument specifically set to one baud rate last time? If so, use that baud
rate to resume communications.
o
Was the instrument set to only RS-232 or only RS-485 last time? If so, resume
communications in the required protocol.
o
Was the instrument set to
RX OFF
last time? If so, a carriage return must be sent
to the instrument immediately after power is applied to interrupt this mode.
•
Was the instrument set to monitor on power up mode? If so, a carriage return must be sent
to the instrument immediately after power is applied to interrupt this mode. To interrupt
monitor on power up, hold down the ENTER key while applying power to the instrument
Instrument fails to log:
•
Verify the LED indicator status:
o
With the instrument in air (NOT submerged), insert the communication cable. The
LED indicator should show solid green indicating the instrument is powered and
ready
Note: If neither a SV
•Xchange™, CT•Xchange™
or Conductivity
•Xchange™ sensor
is installed, the instrument will begin logging in air.
o
Place the instrument
’s
sensors in water. The LED indicator should remain green
and begin flashing, indicating the instrument is powered and logging.
▪
If the indicator shows red, increase the supply voltage to between 10 and
26 volts.
