Intek RheoVac 940 - Manual (Page 25)

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When using the RheoVac software on a PC, the software may give you a “Communication Error.” Use
the following table to determine the source of this message and appropriate action.
TABLE VI. Trouble Shooting Guide
(software com munication erro rs)
OBSERVATION PROBA BLE CAUSE ACTION
Appears the first time
the application was
executed
1. Instrument not connected to the
software defaulted serial port
2. Communication connections not made
or instrument is not powered
1. Cha nge se rial com m po rt setting an d hit
“Retry”
2. Check connections and instrument
power
App ears
intermittently after
application has been
run ning norm ally
1. Elec trical no ise interfering with
communications
2. To o ma ny app lications running in
windows
3. Ano ther ap plicatio n is con flicting with
this comm port or IRQ
1. Change to RS-422 communications, re-
route or shield cab le
2. Close other applications until problem
self corrects
3. Change to a different comm port
Completely stops
working after
application was been
running norm ally
1. Instrument has stopped com municating
2. Loose or damaged communication
connection
1. Check instrument power or look at
instrument display for fault status
2. Check cable adapter at back of PC or at
any other splices or at instrument
Ca nno t be m ade to
wo rk at a ll with
Com3 or Com4
1. W orks fine on Com1 or Com2 but does
not work on other port due to other
hardware conflicts such as a modem 1. Using windows Control Panel - System
utility, check for IRQ o r I/O hardware
conflict - ADVAN CED USER S ONLY
Wo rks fine w ith
RS-232 but does not
work with RS-422
1. Converter module not wired or cabled
correctly
2. Instrument jumper not set to RS-422 or
jack not plugged into RS-422
1. Review communications interface
section of ma nual. Su pplie d ad apter is
for RS-232 only. Convertor connectors
may have d ifferent pinouts.
2. Move jumper or jack
If the RheoVac instrument is operating without fault mode indications but output readings are
questionable, please send to Intek by telefax or e-mail the following plant data: turbine back pressure,
hot well temperature, load, and inlet and outlet circulation water temperatures, along with a 24 hour data
down load from the RheoVac Monitor. (See SECTION 3.4.2)