Allen-Bradley 2755-HDG-4 User Manual page 88

Problem
Scan Beam Present,
Symbols Not Read
Data is decoded but not
transmitted to host.
Troubleshooting and Maintenance
Probable Cause(s)
1. Scanner not set to decode
symbol type scanned.
2. Scanner not held at slight
angle to symbol.
3. Scan beam not crossing
entire symbol.
4. Poor quality bar code
symbols.
5. Loose cable connections.
6. Incorrect interface cable.
1. Scanner is not configured
for the proper cable.
2. Loose connections
3. Scanner communication
settings do not match host
requirements.
Corrective Action
1. Verify the scanner decoder
settings.
2. Hold scanner at an angle
to the symbol.
3. Make sure scan beam
crosses every bar and
space on the symbol.
4. Use the symbols provided
on the inside back cover
for testing.
5. Check for loose cable
connections.
6. Check that you are using
the proper cable.
1. Make sure the scanner is
configured for the correct
cable (standard RS-232 or
smart cable).
2. Check all cable
connections.
3. Verify cable
communication settings
such as baud rate.
Publication 2755-6.2
5-3