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If you are having trouble getting serial data out of the display, first check that you have chosen the
correct mode.
If you are using Continuous Mode C1
Ensure that you have put a link between terminals 18 and 19 to enable the data output.
You can test for data with a simple data monitor which you can make with 2 diodes and a resis-
tor, as shown below.
Provided the baud rate is 9600 or higher, the Green LED should be on for most of the time, and
you should see the red LED flicker as data is sent.
Check to see if data is arriving at the remote location. If the red LED is lit most of the time, with
the green flickering, your wiring may be transposed.
If neither LED is lit, check the meter to make sure it is configured to transmit continuously, and
check your connections to make sure the cabling and connector terminals used are correct.
If you are using Polled Mode P1
Check to see whether there is any data activity, using the simple data monitor shown below. If
not, check the settings in the polling device.
If the polling device is working correctly, check the settings on the display.
You can check to see whether a serial output board has been installed in the display - press the
outer 2 buttons for around 3 seconds and the display will give a summary of installed software
and options.
General
You can use your PC to generate and monitor serial data, with a free program called RealTerm
which you can download from
http://sourceforge.net/projects/realterm/
This can be very useful in diagnosing communication problems.
Simple Data monitor.
2 x LEDs connected
back to back and a
resistor.
Green Red
:-
Green LED on
most of the time.
Red LED
flashes with
data.
1K
Terminal numbers on output
connector of display
RS232
RS422/485
16
18
Fault finding
16
17
11
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