Campbell Scientific TGA100 Trace Gas Analyzer Manual - Manual (Page 102)

10 Troubleshooting
If for some reason the PC transputer cannot communicate with the chassis electronics, a message similar to the one
below will be displayed.
Link open
pserver.exe -v tga
transputer reset
booting from tga.run
pserver: timeout booting tga.run after 0x44a bytes
1Kb booted
Exit code = 0 1
Program not loaded, aborting attempt
If this occurs at startup:
Try to start again.
Verify the analyzer 12 V power supply voltage.
Verify the fiber optic cable from the PC to the analyzer is properly connected.
Turn the analyzer 12V power off, wait a few seconds, then power up and try again.
Turn the analyzer 12V power off, turn the PC power off, wait a few seconds, then power up and try again.
10.1 Fiber Optic Diagnostics
If all cables are properly connected and the electronics are powered up, the problem may be a damaged fiber optic
cable. Note that small debris (a speck of paint, for example) could be obstructing the light path and interrupting
communication. Check all connections and blow lightly into each receptacle to dislodge any such debris. To check the
integrity of the fiber optic cables, complete the following steps:
1. Disconnect the ‘IN’ and ‘OUT’ connectors from the chassis electronics CPU card.
2. Disconnect the ‘IN’ connector from the inside of the TGA enclosure.
3. Connect the ‘OUT’ connector which was previously attached to the CPU card to the now-empty receptacle on the
inside of the TGA enclosure, so that the signal coming into the enclosure simply travels through the fiber labeled
‘OUT’ and goes back out again. The signal should now be able to follow a continuous path from the PC transputer to
the PC link adapter, through the fiber optic cables and back again, bypassing the chassis electronics.
4. From the DOS prompt, type ‘pserver loopback’, then type ‘1’ to select link 1. If the fiber optic cables are
undamaged, a series of dots will appear indicating proper communication. Type <CTRL-C> to terminate operation. If
the fiber optic cables are damaged or if there is not a continuous path from the PC transputer to the link adapter through
the fiber cables and back again (double-check the connections), the diagnostic program will not be able to communicate
and nothing will happen. Type <CTRL-C> to terminate operation.
5. Disconnect the two ‘OUT’ connectors on the inside of the TGA enclosure and replace them with the two
connectors labeled ‘IN’. Repeat step 4 to check the integrity of this portion of the cable.
6. If results from the above testing indicate that the short cable inside the TGA enclosure is damaged, attach the long
outdoor cable directly from the PC link adapter to the CPU card, following the ‘IN’ and ‘OUT’ labels. If the TGA
program downloads and runs properly, the short cable must be replaced.
7. If results indicate that the long outdoor cable is damaged and circumstances allow, attach the short inside cable
directly from the CPU card to the PC link adapter. However, the cable must be crossed on one input. That is, on the
CPU card, attach ‘IN’ to ‘IN’ and ‘OUT’ to ‘OUT’, but on the PC link adapter, attach ‘IN’ to ‘OUT’ and ‘OUT’ to
‘IN’. If the TGA program downloads and runs properly, the long outdoor cable must be replaced.
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