Intek RheoVac 950A - Manual (Page 46)

using the 3-button simultaneous push “Close RV950: System Will Reboot” function or a power cycle for
the changes to take effect.
CAUTION: Modifying any of the other settings in this file could result in undesired behavior.
Figure C2.1: Sample serial.ini file
C.2.8 MODBUS TROUBLESHOOTING
Problem Causes Solution
No response from
RheoVac Model
950
1. System not set for Modbus
communication
2. Incorrect Modbus settings
3. Improper wiring
1. See Figure C2.1, verify [SerialBurst], Status=0
is set in Serial.ini
2. Verify settings in serial.ini file, se Table C2.1
3. Verify wiring connections
Not enough data
resolution in
Multiplied Integer
mode 1. Non-optimal multiplier values set 1. Change the multiplier values in the serial.ini file
located under [DecLoc]
2. Set the values in address registers 0011 - 0020
Multipler values
are changing
1. The RheoVac instrument has
overflow protection built in. When
[process variable]*[multiplier
value] exceeds 65535, the
instrument automatically lowers
the multiplier value to retain usable
output.
1. Request the multiplier value along with process
data rather than hard coding the multiplier value
in the client software
2. Lower the multiplier value for each process
variable that reaches the overflow state
3. Use single precision float mode instead of
multiplied integer mode
Receiving
incorrect error
codes 1. Some client software automatically
inverts the binary representation of
the error code hex value
1. Revert the binary representation
2. Reverse the order of error messages in Table
C2.5
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I:\OFFICE\WPMANUAL\RV950A Appendix C revB.doc Feb. 4, 2010