Serial interfaces
Advantech-DLoG DLT-V83 Series Manual V1.31 Page 127 of 178
11.5. Serial interface barcode scanners
The serial wedge is integrated as standard in WES 2009 and Windows XP Professional
only.
Please note that you have to configure the scanner correctly to EIA-232-E and the
above set BAUD rate following the scanner manufacturer’s guidelines. Otherwise the
software wedge will not function properly.
To activate the integrated scanner software wedge:
Open the Start menu and navigate to Settings | Control Panel | Accessibility.
Select the General tab.
Select Support accessibility option.
Click Settings.
Configure the desired COM1 interface and BAUD rate.
Confirm the change with OK.
Click OK again to apply the changes.
11.6. Tips & tricks
Note that according to the EIA-232-E specification, the maximum cable length is 15 m
at 19,200 bps.
However, according to EIA-422-A for use of a twisted pair line and correct termination
1200 m at up to 100 kbps is possible. For a data rate of 1 Mbps and a high-quality
connection cable, approx. 400 m cable lengths are still possible. Frequent causes of
malfunctions for EIA-232-E connections are the formation of ground loops. If both end
devices establish a ground connection via EIA-232-E but do not share the same ground
potential in their power supply circuits, then compensation currents may result; this is
particularly noticeable with long cables.
These compensation currents, which are also present at the ground point of the EIA-
232-E connection, may significantly degrade signal quality and effectively stop the data
flow. In challenging environments, electrically-isolated connections (via the RS-422/485
option) or external converter from EIA-232-E according to EIA-422/485 are strongly
recommended.
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