Global Water GL500-7-2 Manual page 9

Global Water
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There are 3 ways to connect to the GL500 data Logger, direct connection through
the RS-232 serial port or USB port and dial out through an installed modem.
To make a direct connection to the logger, click the "Direct" option and from the
"Port" menu, select the port you wish to use. For USB access select the USB serial
port at the COM port the driver was assigned, which is automatically shown in the
list. Serial connection is generally done through the 9-pin COM1 connector although
COM2 can also be used. When an external modem or other device is assigned to
COM1, the port can still be used for accessing the logger, but the external device
must be disconnected. Both the serial and USB ports can be connected to the
logger at the same time but you must select which of them is to be used. No
difference will be noticed by the user except while downloading historical data.
Because of the excessive handshaking done by the USB port, the serial port will run
about 50% faster at the same baud rate. Next, select the desired baud rate from the
"Baud Rate" menu. Generally, the fastest rate of 115,200 is used although; long
cables or other factors may require a slower setting. Click "Connect" to make the
connection. If a connection is not made, a message will appear. Check the power
connection, communication cable, driver installation and COM port settings.
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