4700 Refrigerated Sampler Service Guide
Section 4 CPU and Power Supply
4-8
actual test results will appear on your computer screen, the text
displayed on the 4700 can be ignored, except in the case of the
display tests.
Each test is independently accessed by sending a command
starting with T and then a two-digit number so that tests do not
have to be done in a particular order, and can be skipped or
repeated. When each test is done, a string is returned to indicate
the results. These strings will typically return OK if the test
passed and NOT_OK if the test failed. In some cases, OK will be
returned to indicate the end of the test even though the software
cannot determine the results of the test (as in the display test).
Table 4-2 provides an explanation of each functional test.
For
board and wiring diagrams, refer to Figures
A-2
,
A-4
, and
A-5
in Appendix A.
To exit the test mode, type Q<CR>. Remote
menu access time-out will also exit the test mode.
Table 4-2 CPU Board Functional Tests
Function
Command
Results
Inputs/Communication/Interface
Test serial port
T01
Returns SERIAL PORT OK
Calibrate analog input
at 4mA
T04
Apply 4mA to pins 8 (+) and 9 (-) of connector
P3 before entering this command (see Figures
A-2 and A-4 in Appendix A.
Returns the number of counts for this
current, then OK to indicate completion.
The calibrated value will be saved in flash
memory when you enter the save command
T99 at the end of the test sequence.
Calibrate analog input
at 9mA
T09
Apply 9mA to pins 8 (+) and 9 (-) of connector
P3 before entering this command.
Returns the number of counts for this
current, then OK to indicate completion.
The calibrated value will be saved in flash
memory when you enter the save command
T99 at the end of the test sequence.
Calibrate analog input
at 20mA
T20
Apply 20mA to pins 8 (+) and 9 (-) of connector
P3 before entering this command (see Figures
A-2 and A-4 in Appendix A.
Returns the number of counts for this
current, then OK to indicate completion.
The calibrated value will be saved in flash
memory when you enter the save command
T99 at the end of the test sequence.
Test flow meter input
and output (flow pulse
and event mark)
T31
This test requires an external connection
between the event mark output (P2-6) and the
flow pulse input (P2-4). High and low signals
are transmitted from the event mark output.
Returns OK or NOT_OK
Test external interface
outputs
T32
This test takes all 4 external interface outputs
low. Then each line outputs a 100 ms high
signal, followed by a 100 ms low signal, in the
following order: P3-2, P3-3, P3-6, and P3-7.
The lines are left in the low state.
Returns OK to indicate completion
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