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7ML19985CN01
Milltronics SF 500 - INSTRUCTION MANUAL
Page 119
mm
mmm
Troubleshoot
ing
General-Communications
1.
First check to see that:
• There is power at the unit
• The LCD is showing something
• The device can be programmed using the fixed keypad.
1.
Then, check the wiring pin outs and verify that the connection is correct.
2.
Next, go over the setup parameter P770 to P779 and verify that these values match
the settings in the computer that you are using to communicate with it.
3.
Finally, if you should check that the port you are using on the computer. Sometimes
trying a different Modbus driver will solve the problem. An easy stand-alone driver
called ModScan32, is available from Win-Tech at www.win-tech.com. This driver is
very useful to test communications.
Can't print
Not all needed
parameters have
been programmed
Ensure all needed parameters have been
programmed.
Improper wiring
between printer and
SF 500
Ensure proper wiring is done.
The SF 500 is not in
RUN mode.
To print, switch to RUN mode.
Changed a communica-
tions Parameter but does
not seem to be working
The SF 500 power
must be cycled prior
to any communica-
tions parameter tak-
ing effect
Cycle The SF 500 power.
Can't communicate using
Port #2 with 7 data bits
The communications
port #2 is limited to 8
data bits
Use another communications port if 7 data
bits are required.
Remote Totalizer 1 or 2
Exceeded error message
Remote totalizer
buffer has over-
flowed
The remote totalizer resolution has to be
increased.
Remote totalizer
buffer needs to be
cleared
The Internal Totalizer Reset, P648, must be
cleared
Poor communications
using Modbus RTU and
ASCII
Improper wiring or
shielding
Ensure proper wiring and shielding.
Improper Baud Rate
Try different Baud Rate.
Improper request
length
Decrease request length.
Symptom
Cause
Action
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