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7ML19981FB05 MultiRanger 100/200 - INSTRUCTION MANUAL Page 113
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Communication Troubleshooting
Generally
1. Check the following:
• There is power at the unit
• The LCD is showing the relevant data
• The device can be programmed using the hand programmer
2. Check the wiring pin outs and verify that the connection is correct.
3. Verify that values in the set-up parameters (P770 to P779) match the settings in the
computer used to communicate with the unit.
4. Check that the port on the computer is correct. 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 helpful for testing
communications.
Specifically
1. The MultiRanger is set to communicate via a modem but no communication is
returning to the master.
• Check that the parameters are set up correctly and that the correct port is
configured
• Verify the wiring diagram. Note that there is a difference between wiring directly
to a computer and wiring to a modem.
• Verify that the modem is set up correctly. Siemens Milltronics has a series of
Application Guides that may help. Please contact your local Siemens Milltronics
representative for more information on Application Guides.
2. A MultiRanger parameter is set via remote communications, but the parameter
remains unchanged.
• Some parameters can only be changed when the device is not scanning. Try
putting the device in program mode, using the operating mode function.
• Try setting the parameter from the keypad. If it can not be set using the keypad,
check the lock parameter and set it to 1954.