Comprehensive Manual104
© 2018 Nortek AS
Suggestion: Check that you are using the correct baud rate.
3.(no response)
Suggestion: Check that you are using the correct serial port. Go to the device manager;
disconnect the USB to serial converter and then connect it again to detect the correct port.
4. MEASURING
Suggestion: The instrument is measuring. If you want to stop the instrument, send MC ("Message
Confirmed"). If you want the measurements to continue, do not do anything.
5. If you see a response consisting of garbled text or strange characters, the instrument and the
Terminal Emulator might be using different baud rates. The solution is to try other baud rates.
If you have reason to believe that the computer is having problems, do not hesitate to try a different
one!
5.1.7 Loop Back Test
The serial loopback test verifies that the serial port can receive the same characters as it sends. The
aim of this test is to short-circuit the Tx an Rx lines, send a character using the Tx line and loop it
back to the Rx line.
At the serial port
Make a loop-back connector and plug it into your serial port as shown in the figure below.
Now, run the test with the software’s built-in Terminal Emulator, and if that does not work, try
HyperTerminal instead (a terminal program that comes with Windows).
Type characters - whatever you type should be echoed to the screen. Once you remove the connec-
tor, the characters should stop echoing back.
At the serial cable
Plug the cable into the computer
Put a loopback connector on the end of the cable; that is, short-circuit pin 3 & 4 on the 8-pin
underwater connector. This applies to RS-232 communication only.
The same principle applies to RS422, except RX+/TX+ and RX-/TX- must be short-circuited - re-
spectively pin 8/3 and 7/4. This will be the same on the DSUB as for RS232, since that is after the
signal is converted.
Figure: 8-pin connector
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