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Step 7: Troubleshooting
Problem 3B: Software shows status of all EMCs as red dots meaning there is no connection from
the EMC to the PC.
Verify that the RS-485 converter is connected to a functional COM port on the host PC; refer to
Figure 18 (page 20). Also, EMWin will select COM 1 as its default port; however, if using another
port, you must manually designate the COM port in EMWin (refer to the EMWin User's Guide).
Verify the wiring of the RS-485 Converter; refer to Figure 19 on page 20.
Check the RS-485 converter's plug-in 12VDC power supply.
Verify communication termination (W2 jumpered).
Is the Receive (Rx) LED (Green) flickering?
No- A RS-485 converter fault, COM 1 fault, cabling error, or the program is not running. Note:
The EMWin software should be displaying the controller as a "green" or "yellow" dot at the bottom
of the screen.
Frequently Asked Questions Guide
SYMPTOM
No communication between
PC and EMC.
No communication between
EMC and other EMCs.
Com1 error: Port being used.
EMC not on-line.
Run Time Error after initial
installation.
Power Consumption of EMC
Reader Connect/Disconnect
Error
Doc 6001536, Rev C
CHECK
Check RS-485 wiring.
Check EMC DIP switch setting.
In multi-EMC system: EMCs addressed as
EMC #1.
Most common error is DIP Switch is
programmed up-side-down.
Disable all auto-loading background
programs (e.g., Palm Pilot or Phone Link).
Check DIP switch setting for EMC address
number.
Check communication wiring; polarity is
critical. Com (+) to RS-485 (+)/B; COM (-) to
RS-485 (-)/A.
Re-power EMC.
Close all applications before installing
EMWin. Check that no background program
is currently running (e.g., COM Links, Palm
Pilot, or Phone).
Uninstall through the Control Panel any
earlier version of EMWin.
Reinstall EMWin.
The EMC draws less than .250 amps @
12VDC.
All other hardware power consumption must
be sized appropriately.
Change jumper setting for voltage supplied to
readers on jumper W1.
Check reader wiring.
The four unused reader wires cannot short
together or ground to shield. Shorting will
cause erratic behavior.
REFER TO PAGE
20 & 25
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20 & 25
21
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5, 13, & 21
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