Troubleshooting
43
Other Problems
P: Can’t run the configuration program using a serial cable
connection.
S: Check that:
• The communication parameters are set properly.
• Disconnect and reconnect the power supply.
• Power is available... a LED is on.
• The terminal program is operating properly. Try a
loopback connector at the gateway end of the cable to
verify program operation and the proper COM: port.
• The most common problems causing this symptom are
incorrect RS-232 wiring or the Windows Hyperterm
program not operating correctly.
P: Can’t drive more than three RS-485 2-wire loads.
S: Read the section on RS-422 2-wire fan-out and configure the
unit appropriately.
P: Unable to poll some addresses.
S: Read the section on modbus configuration. If port one and
port two addresses overlap, the overlaped addresses are
only sent out port one.
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