7 4.7 Using the LDU 7
Make sure the 2SX-Series Scanner is in communications mode. If the 2SX-Series
Scanner red LED is not lit steadily, the unit is not in communications mode,
and will not communicate through the serial port. Make sure the cable is
plugged firmly into the 6-pin female connector on the 2SX-Series Scanner. Also
check that the DB9 connector is plugged securely into the PC serial port. If the PC
is a laptop, the serial port may be disabled to save power. A disabled serial
port will often not appear as a valid serial port to the 2SX-Series Scanner.
If the 2SX-Series Scanner is in communications mode, the problem is probably
on the PC side. Make sure the comm port is operating properly by checking
the Device Manager (right click on “My Computer”, then select “Properties”).
Check the “Ports” category and make sure the desired communications port
doesn’t have any conflicts (indicated by a red X on the comm port icon). Also
check to see if a mouse or modem is using that comm port. The 2SX-Series
Scanner cannot share a comm port with a modem or mouse.
On some laptops, a comm port may be directed to an infrared port instead
of the regular DB9 connection. This must be re-directed to the standard
external DB9 connection. Due to changes in Windows 98, the infrared port
on laptops is not compatible with the infrared port on the 2SX-Series Scanner.
A serial cable must be used to communicate directly with a laptop.
4.7 Using the LDU
The LDU has an infrared port on the top for communications with newer S
Series Scanners, and an RJ-11 connector on the bottom for serial communications
with a computer or for communications with legacy S Series Scanners.
To use the infrared LDU, point the rectangular infrared window on the top
of the LDU at the infrared ports on the Scanner. The ports on the Scanner
are beside the red LED on the bottom of the Scanner. Turn on the LDU
using the push-button switch at the lower left of the keypad. Make sure the
LDU remains pointing at the Scanner to maintain communications. The LDU
will communicate with the Scanner from up to three feet away. The liquid
crystal display (LCD) on the LDU will open with the words “Power Monitors
Inc.” and will then say “Searching for a Scanner.” The LDU looks first for
a PC on the RJ-11 port, then for a Scanner through the infrared port, then
for a legacy Scanner on the RJ-11 port. The LCD will read, “Communicating
with Scanner” when it makes a link. If a PC is connected to the LDU, the
LCD will read, “PC is connected to LDU.” If you move the LDU too far from
the Scanner or point it away you will receive a message saying you have lost
communications with the Scanner. Turn the LDU off, point it at the Scanner,
and turn it back on.
